RRB JE EEE (CBT II) Mock Test- 1


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150 Questions MCQ Test RRB JE Mock Test Series Electrical & Electronics Engineering | RRB JE EEE (CBT II) Mock Test- 1

RRB JE EEE (CBT II) Mock Test- 1 for Railways 2022 is part of RRB JE Mock Test Series Electrical & Electronics Engineering preparation. The RRB JE EEE (CBT II) Mock Test- 1 questions and answers have been prepared according to the Railways exam syllabus.The RRB JE EEE (CBT II) Mock Test- 1 MCQs are made for Railways 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for RRB JE EEE (CBT II) Mock Test- 1 below.
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RRB JE EEE (CBT II) Mock Test- 1 - Question 1

When the vibrating object moves backwards, it creates a region of low pressure in the medium called _______________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 1 The vibrating object produces a series of compressions and rarefactions, one after the other in the medium. These pulses travel one behind the other as the sound waves move forward. When this sound wave reaches our ear, it forces the tympanic membrane to vibrate and thus causes the sensation of hearing.
RRB JE EEE (CBT II) Mock Test- 1 - Question 2

Find the potential energy gained by a body of mass 60 kg, if it is raised by 12 m.(use g = 10 m/s²)

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 2

Given that,

m=60 kg, g=10m/s2, h=12m

Potential energy= mgh

=60x10x12

=7200Joules

RRB JE EEE (CBT II) Mock Test- 1 - Question 3

Light is a ______________ wave.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 3 Light and other types of electromagnetic radiation are transverse waves. Water waves and S waves(a type of seismic wave) are also transverse waves. In transverse waves, the vibrations are at right angles to the direction of travel.
RRB JE EEE (CBT II) Mock Test- 1 - Question 4

What is the effective resistance(in Ω) of two resistors 21 Ω and 28 Ω connected in parallel?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 4

In parallel

1/R=1/R1+1/R2

l/R=l/21+l/28

1/R=(4+3)/(7x3x4)=7/84=1/12

1/R=1/12

R=12H

RRB JE EEE (CBT II) Mock Test- 1 - Question 5

If the velocity of a body is doubled its kinetic energy ________________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 5 Kinetic energy is directly proportional to the mass of the object and the square of its velocity: K.E. = 1/2 m v2

If v'=2v

Then K.E'=m(2v)2/2 =2mv2

=4(mv2)/2

=4fK.E).

RRB JE EEE (CBT II) Mock Test- 1 - Question 6

Propagation of sound can be visualized as propagation of _____________ variations in the medium.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 6 Sound is a sequence of waves of pressure that propagates through compressible media such as air or water. During their propagation, waves can be reflected, refracted, or attenuated by the medium.
RRB JE EEE (CBT II) Mock Test- 1 - Question 7

Why is weightlessness experienced while orbiting the earth in space ships?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 7 Weightlessness experienced while orbiting the earth in space ships is due to Zero gravity.
RRB JE EEE (CBT II) Mock Test- 1 - Question 8

According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 8 An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element according to the every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
RRB JE EEE (CBT II) Mock Test- 1 - Question 9

Which statement(s) is/are CORRECT regarding Dalton’s Atomic theory?

I. All matters are made of very tiny particles.

II. Atoms of different elements have different masses and chemical properties.

III. The relative number of atoms is variable in any compound.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 9 Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
RRB JE EEE (CBT II) Mock Test- 1 - Question 10

In a combination reaction there can be ______.

I. Two or more than two reactants

II. Two or more than two products

III. Only one product

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 10 A combination reaction(also known as a synthesis reaction) is a reaction where two or more elements or compounds(reactants) combine to form a single compound(product). Such reactions may be represented by equations of the following form: X + Y → XY.
RRB JE EEE (CBT II) Mock Test- 1 - Question 11

Which of the following fuel has maximum calorific value?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 11 Petrol has maximum calorific value as compare to other options.
RRB JE EEE (CBT II) Mock Test- 1 - Question 12

If an atom has atomic number 10 and mass number 23, then what will be the number of protons and neutrons in an atom respectively?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 12 Atomic Number =Number of Proton

Number of proton =10

Mass number =Number of proton + Number of Neutron

Number of Neutron=23-10

=13

RRB JE EEE (CBT II) Mock Test- 1 - Question 13

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that ______.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 13 While cooking, if the bottom of the vessel is getting blackened on the outside, then it means that the fuel is not burning completely.
RRB JE EEE (CBT II) Mock Test- 1 - Question 14

Atomic number is always equal to ______.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 14 The number of protons in the nucleus of the atom is equal to the atomic number(Z).
RRB JE EEE (CBT II) Mock Test- 1 - Question 15

Which of the following statement(s) is/are INCORRECT?

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 15 Alkenes are more reactive due to the properties of the carbon-carbon bond. When alkenes are burnt in an atmosphere that is rich in oxygen and if the temperature is high enough, the alkenes burn giving CO2 and H2O. Alkenes do not burn with blue flame and Alkanes do not burn with yellow flame.
RRB JE EEE (CBT II) Mock Test- 1 - Question 16

Which place is NOT associated with Gautama Buddha?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 16 Astamahasthanas are eight great holy places associated with the life of Buddha. These include four pilgrimage sites related to the life of Gautama Buddha viz. Lumbini, Bodhgaya, Sarnath and Kushinagara and four other sites viz. Sravasti, Sankasya, Rajgir and Vaishali. Pawapuri is not associated with him.
RRB JE EEE (CBT II) Mock Test- 1 - Question 17

Mir Hassan Dehlavi was in the court of which of the following?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 17 Mir Hassan Dehlavi was in the court of Alauddin Khilji.
RRB JE EEE (CBT II) Mock Test- 1 - Question 18

During the Maratha period, who was the officer responsible for the village administration?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 18 During the Maratha period, Patil was the officer responsible for the village administration.
RRB JE EEE (CBT II) Mock Test- 1 - Question 19

Which of the following organizations was established outside India?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 19 The East India Association was founded by Dadabhai Naoroji in 1866, collaborating with Indians and retired British officials in London. It superseded the London Indian Society and was a platform for discussing matters and ideas about India and to provide representation for Indians to the Government.
RRB JE EEE (CBT II) Mock Test- 1 - Question 20

Who of the following leaders is NOT associated with Champaran Satyagraha?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 20 Sardar Patel is NOT associated with Champaran Satyagraha.
RRB JE EEE (CBT II) Mock Test- 1 - Question 21

‘Local Government’ is a subject mentioned in which list under the 7th schedule of the Indian constitution?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 21 ‘Local Government’ is in the State subject list of the Seventh Schedule of the Indian Constitution.
RRB JE EEE (CBT II) Mock Test- 1 - Question 22

Comptroller and Auditor General of India submits the audit reports to _______.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 22 The reports of the Comptroller and Auditor-General of India relating to the Union accounts shall be submitted to the president, who shall cause them to be laid before each House of Parliament.
RRB JE EEE (CBT II) Mock Test- 1 - Question 23

Anti-defection law was passed in which Constitutional Amendment Act?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 23 The Anti-Defection Law was passed in 1985 through the 52nd Amendment to the Constitution, which added the Tenth Schedule to the Indian Constitution.
RRB JE EEE (CBT II) Mock Test- 1 - Question 24

The word monsoon refers to ___________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 24 A monsoon is a seasonal shift in the prevailing wind direction that usually brings a different kind of weather. It almost always refers to the Asian monsoon, a large region extending from India to Southeast Asia where monsoon conditions prevail.
RRB JE EEE (CBT II) Mock Test- 1 - Question 25

Which part of the Earth has the abundance of nickel and iron?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 25 The outer core is about 1,400 miles thick, and it's made mainly of a combination(called an alloy) of iron and nickel(NIFE), along with small amounts of other dense elements like goldmammalsnum, and uranium.
RRB JE EEE (CBT II) Mock Test- 1 - Question 26

Konkan coast is stretched from where to where?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 26 Konkan coastal plain of western India is between the Arabian Sea(west) and the Western Ghats(east). The plain stretches approximately 330 miles(530 km) from the Daman Ganga River north of Mumbai(Bombay) to the Terekhol River between Maharashtra and Goa states and Daman and Diu union territory in the south.
RRB JE EEE (CBT II) Mock Test- 1 - Question 27

Which State declared Dolphin as State aquatic animal?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 27 On February 2, 2019, Punjab Chief Minister Captain Amarinder Singh declared one of the rarest mammal, the Indus River Dolphin, only found in the Beas River, as Punjab State Aquatic Animal.
RRB JE EEE (CBT II) Mock Test- 1 - Question 28

Sentinelese Tribe, which is in news recently, is located in the following islands?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 28 The North Sentinel Island(NSI) is home to the Sentinelese tribe, which has consistently refused interaction with the outside world.
RRB JE EEE (CBT II) Mock Test- 1 - Question 29

Dikkibandi stadium was renamed after former Lok Sabha Speaker Purno A Sangma. It was located in the state of;

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 29 The Meghalaya Cabinet has decided to rename the Dikkibandi stadium in Tura town after former Lok Sabha Speaker Purno A. Sangma.
RRB JE EEE (CBT II) Mock Test- 1 - Question 30

Which country has won the team event at the first Mallakhamb World Championship 2019?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 30 India emerged as the winner in the First Mallakhamb World Championship team event in Shivaji Park in central Mumbai, in which India became the winner.
RRB JE EEE (CBT II) Mock Test- 1 - Question 31

Who has been conferred with the Gandhi Peace Prize for the year 2018?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 31 Japan's Yohei Sasakawa was conferred with the Gandhi Peace Prize for 2018 to contribute to Leprosy Eradication in India and across the world.
RRB JE EEE (CBT II) Mock Test- 1 - Question 32

Which among the following ministry gives Medini Puraskar every year?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 32 The environment ministry has decided to re-introduce a scheme for awarding Medidi Puruskar to Indian authors for their original work in Hindi on subjects related to the environment including pollution and climate change.
RRB JE EEE (CBT II) Mock Test- 1 - Question 33

Which among the following day is observed to commemorate the signature of the Montreal Protocol?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 33 The United Nations(UN) International Day for the Preservation of the Ozone Layer is celebrated on September 16 every year. This event commemorates the date of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987.
RRB JE EEE (CBT II) Mock Test- 1 - Question 34

Which among the following is a correct definition of an Ecotone?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 34 An ecotone acts as the boundary or barrier between two biomes. It is the area where two distinct types of environments merge and blend. Ecotones could be the border where forestland and grassland meet or the boundary where wetlands meet prairie.
RRB JE EEE (CBT II) Mock Test- 1 - Question 35

One of the major objectives of the National Water Mission is to increase the water use efficiency by 20%. Which among the following is the correct definition of water use efficiency?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 35 One of the major objectives of the National Water Mission is to increase the water use efficiency by 20% which mean increase the ground water level by proper management of rainwater.
RRB JE EEE (CBT II) Mock Test- 1 - Question 36

Which among the following National Park is distinct in India because it encompasses a Project Tiger Reserve, an Elephant Reserve and a Biosphere Reserve(all of them)?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 36 Manas National Park is a national park, UNESCO Natural World Heritage site, a Project Tiger reserve, an elephant reserve and a biosphere reserve in Assam, India. Located in the Himalayan foothills, it is contiguous with the Royal Manas National Park in Bhutan. The park is known for its rare and endangered endemic wildlife such as the Assam roofed turtle, hispid hare, golden langur and pygmy hog.
RRB JE EEE (CBT II) Mock Test- 1 - Question 37

Which among the following National Park in India is also called the last house of White winged Wood Duck?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 37 Endangered White-winged(Wood) Ducks(Cairina scutulata) found in Nameri Tiger Reserve in Assam.
RRB JE EEE (CBT II) Mock Test- 1 - Question 38

Which among the following is the most correct statement in context with Carbon footprint?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 38 A carbon footprint is historically defined as the total emissions caused by an individual, event, organization, or product, expressed as carbon dioxide equivalent.
RRB JE EEE (CBT II) Mock Test- 1 - Question 39

Which among the following countries is not a Non Annex I party to the UNFCC?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 39 As of 2015, the UNFCCC has 197 parties. Parties to the UNFCCC not listed in Annex I of the Convention are mostly low-income developing countries. Developing countries may volunteer to become Annex I countries when they are sufficiently developed. Australia is not a Non Annex I party to the UNFCC.
RRB JE EEE (CBT II) Mock Test- 1 - Question 40

Which among the following World Heritage site of India is owned by two states?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 40 Kalka Shimla Railway line is the World Heritage site of India is owned by two states of Haryana and Himachal Pradesh.
RRB JE EEE (CBT II) Mock Test- 1 - Question 41

A series circuit has 100 resistors, each having a resistance of 1 Ω and 1 A current is flowing through this circuit. What will be the current in the circuit when these 100 resistors are connected in parallel?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 41 We know that,

In parallel circuit sum of the currents through each path is equal to the total current that flows from the source.

Total resistor in the circuit = 100

The value of each resistor = 1 Ω

The current in each resistor when connected in series = 1 A

Source voltage = 1 × 100 = 100 V

The current in the circuit when these 100 resistors are connected in parallel = 100 × 100 = 10000 A

RRB JE EEE (CBT II) Mock Test- 1 - Question 42

A 400 V, three-phase, four-wire is feeding a balanced load of 100 W lamp in each phase. If the lamp in one of the phases goes off. What will be the reading of the ammeter connecting neutrals of the supply and load?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 42 During balance load total power P = 3 × 100 = 300 W

If the lamp in one of the phases goes off, then total power = 300 × 0.57 = 171 W

∴ the reading of ammeter connecting neutrals = 171/400 = 0.43 A

RRB JE EEE (CBT II) Mock Test- 1 - Question 43

Which of the following is a common name for the crime of stealing password?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 43 spoofing refers tricking or deceiving computer systems or other computer users. This is typically done by hiding one's identity or faking the identity of another user on the Internet.
RRB JE EEE (CBT II) Mock Test- 1 - Question 44

Workbook is a collection of __________ in MS Excel?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 44 Workbook is a collection of worksheet in MS Excel
RRB JE EEE (CBT II) Mock Test- 1 - Question 45

Which PowerPoint view displays each slide of the presentation as a thumbnail and is useful for rearranging slides?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 45 Slide sorter view in PowerPoint or OpenOffice Impress is a window that displays thumbnail versions of all your slides, arranged in horizontal rows. This view is useful to make global changes to several slides at one time. Rearranging or deleting slides is easy to do in Slide Sorter view
RRB JE EEE (CBT II) Mock Test- 1 - Question 46

Which of the following is the fastest media of data transfer?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 46 A fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting messages modulated onto light waves.
RRB JE EEE (CBT II) Mock Test- 1 - Question 47

LANs can be connected by which of the following devices which operate on the data link layer?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 47 Bridges operate on data link layer and they can be used to connect LANs.
RRB JE EEE (CBT II) Mock Test- 1 - Question 48

In which process, each program is split into fixed size program components called pages?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 48 Paging is a process in which each program is split into fixed size program components called pages. Some pages of it are loaded in the main memory, depending upon the storage availability and requirement to execute program.
RRB JE EEE (CBT II) Mock Test- 1 - Question 49

Different icons of application software can be found in which bar in latest version of Microsoft Windows?

RRB JE EEE (CBT II) Mock Test- 1 - Question 50

If a word is typed that is not in MS Word's dictionary, a wavy underline appears below the word. What is the color of the underline that appears in this situation?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 50 This indicates either a possible spelling error or that Word doesn't recognize a word, such as a proper name or place. Green underline- Word thinks that grammar should be revised. Blue underline- A word is spelled correctly but does not seem to be the correct word for the sentence.
RRB JE EEE (CBT II) Mock Test- 1 - Question 51

Which line separates stator and rotor copper losses in circle diagram of an induction motor?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 51 Circle Diagram:

- It is the diagrammatic representation of the performance of the induction motor.

- It provides information about the power output, losses and the efficiency of the induction motor.

Significance of lines on the Circle Diagram:

Input line: The vertical distance between any point on the circle and the input line represent the input power.

Output line: The vertical distance between any point on the circle and the output line represents the output power.

Air gap power line: This line represents the air gap power. This line is also known as a torque line. It separates stator and rotor copper losses in the circle diagram.

RRB JE EEE (CBT II) Mock Test- 1 - Question 52

The deflection sensitivity of the CRO is 10 m/V. What is the value of deflection factor (in V/m)?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 52 Given that, deflection sensitivity (s) = 10 m/v

Deflection factor (D) is reciprocal of sensitivity.

D = 1/s = 1/10 = 0.1 v/m

RRB JE EEE (CBT II) Mock Test- 1 - Question 53

In a series RC circuit, the current ____ the voltage by an angle ____ degrees.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 53

- In the pure capacitive circuit, the current leads the voltage by 90°.

- In a series RC circuit, the current leads the voltage by an angle between 0 to 90°.

- In the pure inductive circuit, the current lags the voltage by 90°.

- In a series RL circuit, the current lags the voltage by an angle the between 0 to 90°.

RRB JE EEE (CBT II) Mock Test- 1 - Question 54

Find the maximum power is delivered to the load

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 54 Here, only RL is variable; hence for maximum power transfer occurs when the

RRB JE EEE (CBT II) Mock Test- 1 - Question 55

What will be the flux density (in T) of material in free space if the field strength of the material is 2 × 105 A-m-1 and the magnetic susceptibility of the material is 0.44 × 10-3?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 55 Given that, magnetic field strength (H) = 2 × 105 A-m-1

Magnetic flux density, B = μH = 4π × 10-7 × 2 × 105 = 0.25 T

RRB JE EEE (CBT II) Mock Test- 1 - Question 56

Which of the following statement is true about RMS voltage?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 56

- RMS voltage of a sinusoidal waveform is directly proportional to the peak voltage.

For a sinusoidal waveform,

- Multimeters measure average value of voltage and current of different waveforms.

- The RMS value of a sinusoidal waveform gives half of the heating effect than a DC current of the same value.

- The ratio of the RMS value of voltage to the maximum value of voltage is the same as the ratio of the RMS value of current to the maximum value of current.

RRB JE EEE (CBT II) Mock Test- 1 - Question 57

Water pollution in rivers is measured by the dissolved amount of

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 57

- Water pollution in rivers is measured by the dissolved amount of oxygen

- BOD is used to measure water pollution as higher BOD means a higher amount of water pollution

- If the BOD of water is zero, then the water is safe to drink

RRB JE EEE (CBT II) Mock Test- 1 - Question 58

Which of the following statements is true?

The velocity of sound is:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 58

- The velocity of sound is more in summer than in winter because the sun evaporates more water from the surface, and as a result, the moisture in the atmosphere is more which makes the air to travel faster.

- Speed of sound is lower when density is higher.

- Sound waves are generated by causing pressure differences.

- It's high when pressure is high. Density over pressure gives temperature. Therefore, sound travels faster in summers.

RRB JE EEE (CBT II) Mock Test- 1 - Question 59

An object is placed 100 cm in front of a concave mirror. The real image of the object is formed 50 cm in front of the mirror. What is the object's magnification?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 59 U = -100

V = -50

M = -V/U = 50/-100 = -0.5

RRB JE EEE (CBT II) Mock Test- 1 - Question 60

Two coils of inductances 4 H and 6 H are connected in parallel. If their mutual inductance is 3H, calculate the equivalent inductance of the combination mutual inductance opposes the self-inductance.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 60 Given

L1 = 4H L2 = 6H M = 3H

Mutual inductance opposes the .

Important:

Mutual inductance assists the self-inductance

RRB JE EEE (CBT II) Mock Test- 1 - Question 61

A 100 μH coil has a Q value of 200 at 2 MHz. The effective resistance of the coil is________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 61 Given

Quality factor = 200, Frequency = 2 MHz, Inductance = 100 μH

We know that

Here f = Frequency, L = Inductance of coil, R = Resistance of coil

RRB JE EEE (CBT II) Mock Test- 1 - Question 62

It is required to measure the true open circuit e.m.f. of a battery. The best device is

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 62

- A potentiometer is an instrument designed to measure an unknown voltage by comparing it with the unknown voltage

- The known voltage may be supplied by a standard cell or any other known voltage reference source

- It makes use of a balance or null condition, no current flows, and hence no power loss is consumed in the circuit

- Thus, the determination of voltage by a potentiometer is quite independent of the source resistance

- Measurements using comparison methods are capable of a high degree of accuracy because the result obtained does not depend upon the actual deflection of the pointer, as in the case of deflection methods

- Hence potentiometer is the best device to measure the true open circuit e.m.f. of a battery

RRB JE EEE (CBT II) Mock Test- 1 - Question 63

Which one of the following is an example of an operating system?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 63 An operating system is system software that acts as an interface between the user and the hardware resources. It provides a variety of services to the computer.

It performs all the basic tasks like file management, memory management, process management, handling input and output, and controlling peripheral devices such as disk drives and printers.

Some popular Operating Systems include Linux and Windows.

Windows Operating System

Every computer needs an operating system for operating a computer. There are few around, and Microsoft Windows is just one of them.

Some of the functions the Windows operating system allows to do are:

- Access applications (programs) on the computer (word processing, games, spreadsheets, calculators, and so on)

- Load any new programs onto the computer

- Manage hardware such as printers, scanners, mike, digital cameras

- Manage how files are stored on a computer (File Management, covered later in this module)

- Change computer settings such as colour schemes, screensavers, and the resolution of the monitor

There are several versions of Microsoft Windows in existence like Windows XP, Windows Vista, Windows 7 and Windows.

RRB JE EEE (CBT II) Mock Test- 1 - Question 64

A transformer on no load has an induced emf of 230V (rms), draws a current of 2A (rms),that and having an angle between them is 60°, then the value of core loss is ________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 64

Concept:

Core loss (PC) = VI­C

IC = I cos ϕ

V is induced emf

I is current

ϕ is phase difference between induced emf and current

Calculation:

Given that, induced emf (V) = 230 V

Current (I) = 2 A

Phase difference (ϕ) = 60°

I­C = I cos ϕ = 2 cos 60° = 1 A

Core loss (PC) = 230 W

RRB JE EEE (CBT II) Mock Test- 1 - Question 65

To reverse the direction of rotation of a capacitor start motor while it is running, we should

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 65 The direction of rotation of a capacitor start motor can be reversed by reversing the connection of the main winding or auxiliary winding.

To reverse the direction of rotation of a capacitor start motor while it is running, we should disconnect the motor from the supply till it stops then reconnect it to supply with the reversed connection of main or auxiliary winding.

RRB JE EEE (CBT II) Mock Test- 1 - Question 66

Which of the following is true with regenerative braking?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 66 Regenerative braking uses an energy recovery mechanism that slows down a vehicle by converting its kinetic energy into another form.

Important:

Regenerative braking: In this type of braking back, Eb is greater than the supply voltage V, which reverses the direction of the motor armature current. The motor begins to operate as an electric generator.

Dynamic braking: In this type of braking, the DC motor is disconnected from the supply and a braking resistor Rb is immediately connected across the armature. The motor will now work as a generator and produces the braking torque.

Plugging: In this method, the terminals of supply are reversed, as a result of the generator torque also reverses which resists the normal rotation of the motor and as a result the speed decreases

RRB JE EEE (CBT II) Mock Test- 1 - Question 67

In 4 wire electric circuit, the black conductor is used for

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 67

RRB JE EEE (CBT II) Mock Test- 1 - Question 68

The split-phase induction motor has

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 68

- Split phase induction motors have low starting current and moderate starting torque

- So, these motors are used in fans, blowers, centrifugal pumps, washing machine, grinder, lathes, air conditioning fans, etc.

- These motors are available in the size ranging from 0.05 kW to 0.5 kW

RRB JE EEE (CBT II) Mock Test- 1 - Question 69

The critical temperature above which ferromagnetic materials lose their magnetic property is known as

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 69 Curie temperature: It is the temperature above which ferromagnetic materials lose their permanent magnetic field and the magnetism completely disappears.

The magnetic susceptibility decreases with an increase in temperature. So, the ferromagnetism decreases with rising temperature. It is maximum at absolute zero temperature and becomes zero at Curie temperature. Above this temperature, the ferromagnetic material behaves as paramagnetic substance.

RRB JE EEE (CBT II) Mock Test- 1 - Question 70

If α = 0.995, IE = 10 mA and ICO = 0.5 μA, then ICEO will be

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 70 We know that

ICEO = 100 μA

RRB JE EEE (CBT II) Mock Test- 1 - Question 71

Low resistances are provided with four terminals

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 71 Low resistances are provided with four terminals in order that the resistance value becomes definite irrespective of nature of constants at the current terminals

Four terminal measurements are used for low resistance measurement to avoid contact resistances and the effect of measuring instrument on a measured value.

Two outermost terminals are used to inject current in the low-value resistance. Voltage is measured across two inner terminals. This ensures that any contact resistance drop at current terminals does not affect voltmeter reading.

The value of low resistance is measured between the potential terminal P and P’.

RRB JE EEE (CBT II) Mock Test- 1 - Question 72

For the network shown below, Norton’s equivalent current across AB is given by:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 72 Norton’s equivalent current is nothing but the short circuit current that flows through terminals A and B.

Let the short circuit current be Isc­.

The circuit can be reduced as,

By using the current division rule,

RRB JE EEE (CBT II) Mock Test- 1 - Question 73

An incandescent lamp is rated at 100 W, 230 V. What will be its resistance when measured with the help of a multimeter?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 73 Concept

We know that

Here P = Power, V = Voltage, R = Resistance

Calculation:

RRB JE EEE (CBT II) Mock Test- 1 - Question 74

A shunt resistor is connected across the contacts of a circuit breaker to:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 74

- It is a method adopted for dampening the over-voltage transients due to current chopping.

- In this method, a shunt resistance is connected across the contacts of the circuit breaker.

- It reduces the rate of rising of re-striking voltage and the peak value of re-striking voltage.

- It helps to reduce the transient voltage surge during current chopping and capacitive current breaking.

RRB JE EEE (CBT II) Mock Test- 1 - Question 75

A battery had a short-circuit current of 30 A and an open-circuit voltage of 24 V. If the battery is connected to an electric bulb of resistance 2 Ω, the power dissipated by the bulb is:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 75 Given

Open circuit voltage = VOC = 24 V, Short circuit current = ISC = 30 A

We know that

Resistance = VOC/ISC = 30/24 = 1.2 Ω

Current I = V/R = 24/3.2 = 7.5 A

The power dissipated by the bulb is = I2 x R = 7.52 x 2 = 112.5W

RRB JE EEE (CBT II) Mock Test- 1 - Question 76

What does the fourth colour band on a resistor mean?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 76 The four band colour code is the most common variation. These resistors have two bands for the resistance value, one multiplier,a An anode and one tolerance band.

RRB JE EEE (CBT II) Mock Test- 1 - Question 77

The impedance of an ideal parallel LC circuit at resonance is

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 77 Resonance in electric circuits is the phenomena, in which at a certain input voltage frequency the voltage and current drawn by the circuit are in phase.

In parallel resonant circuit at resonance frequency the impedance is maximum.

For parallel LC circuit

Y = 0

Since Y = 0 , Z = ∞

RRB JE EEE (CBT II) Mock Test- 1 - Question 78

The current capacity of the battery depends upon

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 78 The capacity of a battery is usually measured in amp-hours. This is a measure of the number of electrons that can be removed from the battery. The capacity is proportional to the size of the electrodes.

Anode acts as negative electrode; it is a material that undergoes oxidation during the cell discharge.

The cathode acts as a positive electrode; It is a material that undergoes reduction during the cell discharge.

RRB JE EEE (CBT II) Mock Test- 1 - Question 79

Major aerosol pollutant in jet plane emission is

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 79 Aerosols are chloroform-hydrocarbon compounds released into the air with force in the form of vapour. The main source of aerosols is the emission of jet planes, where fluorocarbons are used. These chlorofluorocarbons deplete the ozone layer in the higher atmosphere. These CFC ‘s has produced a hole in the ozone layer.
RRB JE EEE (CBT II) Mock Test- 1 - Question 80

In troposphere,gaseous mixture containing oxygen, nitrogen, and carbon dioxide cycle in nature through

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 80

- The atmosphere is the thin layer of gases separating earth from the outer space

- The lower atmosphere is a mixture of molecules of three important gases: Oxygen (O2), Nitrogen (N2), and Carbon dioxide (CO2), along with water vapor and trace amounts of several other gases that have no immediate biological importance

- The gaseous mixture of the troposphere (the lowest layer of atmosphere in which living organisms operate) is called air containing oxygen, nitrogen, and carbon dioxide, all of which cycle in nature through biogeochemical cycles

Important points:

- We live in a biological ecosystem that shows a constant flow of energy between various organisms

- There is an exchange of nutrients, which translates to exchange of energy

- Nutrients ultimately are chemical compounds. So, there is this natural pathway where the living matter is constantly circulated

- Nutrients are never lost from an ecosystem; Recycling of these nutrients happens at every stage

- This recycling of the nutrients through different components in an ecosystem is called the nutrient cycle or biogeochemical cycle

RRB JE EEE (CBT II) Mock Test- 1 - Question 81

Where are the Buddhas of Bamiyan located?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 81

- The Buddhas of Bamiyan is located in the Hazarat region of Afghanistan.

- Buddhas of Bamiyan are 2 statues of Gautama Buddha made in the 6th century.

- The statues are made in the Gandharan Style of Architecture.

- The Taliban destroyed them in the year 2001.

RRB JE EEE (CBT II) Mock Test- 1 - Question 82

Which article of the Constitution of India ensures the freedom of the press?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 82

- Article 19 of the Constitution of India ensures the freedom of the press.

- The Indian Constitution ensures that all citizens have the right to freedom of speech and expression.

RRB JE EEE (CBT II) Mock Test- 1 - Question 83

A Satellite has a mass of 100 kg and is initially travelling at 2.64 × 103 m/s . To correct its orbit, a thruster is fired for 2.25 seconds which changes the speed of the satellite to 4.89 × 103 m/s.

The force generated by the thruster is:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 83 The force exerted is given by

RRB JE EEE (CBT II) Mock Test- 1 - Question 84

If there are three resistances each of 2 ohm and generate the effective resistance of 3 ohm so how will the connection of the three resistances in the circuit?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 84 A parallel combination of two 2 ohms resistance gives

R’ = 2 || 2 = 1 Ω

Connecting this combination in series with 2 Ω resistance gives

Req = R’+ 2 = 1 + 2 = 3

Hence, A parallel combination of two resistance (which will be 1 ohm) joined in series with the third resistance (2 ohm)

RRB JE EEE (CBT II) Mock Test- 1 - Question 85

Potier triangle is required to calculate voltage regulation in which of the following method?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 85

- The Potier triangle determines the voltage regulation of the machines

- This method is also called a zero power factor (ZPF) method

- This method depends on the separation of the leakage reactance of armature and their effects

- The graph of the Potier triangle is shown in the figure below

- The triangle formed by the vertices a, b, c has shown below in the figure is called Potier triangle

RRB JE EEE (CBT II) Mock Test- 1 - Question 86

If the slip of an induction motor is 100% then what will its speed be?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 86 In the induction motor rotor always rotates speed less than synchronous speed.

The difference between the rotor speed (N) and the rotating magnetic flux speed (Ns) is called slip.

The induction motor slip is usually expressed as a percentage of synchronous speed (NS) and is represented by the symbol s.

Mathematically, Percentage slip,

Or fractional slip,

At start, N = 0, therefore, Slip,

At synchronous speed, Slip,

RRB JE EEE (CBT II) Mock Test- 1 - Question 87

For the circuit shown below, find the current (in A) produced by the 50 V battery.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 87 By using star to delta conversion, we can reduce the given circuit as follows.

I1 = 50/3.75 = 13.33 A

I2 = 50/7.5 = 6.66 A

Total current (I) = I1 + I2 = 20 A

RRB JE EEE (CBT II) Mock Test- 1 - Question 88

Potentiometer sensitivity can be increased by

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 88 Potentiometer is an instrument which is used to measure a known emf by comparison with known emf.

Sensitivity of potentiometer is the smallest potential difference that can be measured using the potentiometer. It can be increased by decreasing its potential gradient. Thus, it can be increased by the following methods.

1) By increasing the length of the potentiometer wire as the length of the wire is directly proportional to resistance.

2) If the potentiometer wire is a fixed length, the potential gradient can be decreased by reducing the current in the circuit by varying rheostat.

RRB JE EEE (CBT II) Mock Test- 1 - Question 89

What is the power factor of the circuit when a current of 8 A flows in the ac circuit when 100 V dc is applied to it whereas it takes 125 V ac to produce the same current?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 89 Power Factor is a ratio of the real power and apparent power flowing in the circuit.

cosϕ = 100/125 = 0.8

Important:

Active power (measured in Watt) is actual power or true power which does the useful work. (so, most of the equipment’s which consume electricity or electric power are rated in terms of Watt or HP)

Reactive power (measured in Volt-Ampere- Reactive) is imaginary power thata the is required for the processes like energy conversion & energy storage. (so, the equipment’s which generate only reactive power are rated in terms of VAr. e.g. capacitor banks for pf correction)

Apparent power (measured in terms of Volt-Ampere) is total power. And is combination of active and reactive powers

RRB JE EEE (CBT II) Mock Test- 1 - Question 90

An induction meter can handle current upto

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 90

- Induction type of energy meter are universally used for measurement of energy in domestic and industrial A.C circuit

- The unit of electrical energy is kilowatt hour (KWh)

- Induction type of energy meter used is based on the “electromagnetic induction” principle

- They are known as induction type instruments

- An induction meter can handle current up to 100 A

RRB JE EEE (CBT II) Mock Test- 1 - Question 91

In a Zener diode with high breakdown voltage

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 91 This type of breakdown occurs at the reverse bias voltage above 8 V and higher. It occurs for lightly doped diode with large breakdown voltage. As minority charge carriers (electrons) flow across the device, they tend to collide with the electrons in the covalent bond and cause the covalent bond to disrupt.
RRB JE EEE (CBT II) Mock Test- 1 - Question 92

The carbon arc welding has the advantages of:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 92

Advantages of carbon arc welding:

- The heat developed during the welding can be easily controlled by adjusting the length of the arc

- It is quite clean, simple, and less expensive when compared to other welding processes

- Both the ferrous and non-ferrous metals can be welded

- Easily adaptable to automation

Disadvantages of carbon arc welding:

- Input current required in this welding, for the workpiece to raise its temperature to welding temperature, is more

- In case of ferrous metal, there is a chance of disintegrating the carbon at high temperature and transfer to the weld, which causes weld deposit to be harder and brittle

- A separate filler rod has to be used if any filler metal is required

RRB JE EEE (CBT II) Mock Test- 1 - Question 93

Find the current I shown in the figure

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 93 Apply superposition theorem

Consider 10 V source and open the current source.

Now consider current source and inactive the voltage source.,

I2 = 5 A

∴ Total current I = I1 + I2 = 1 + 5 = 6 A

RRB JE EEE (CBT II) Mock Test- 1 - Question 94

The lamp used in cinema projector is:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 94

RRB JE EEE (CBT II) Mock Test- 1 - Question 95

Which of the following statements correctly defines "Utilization factor" or "Co-efficient of Utilization"?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 95

Coefficient of utilization or utilization factor: It is defined as the ratio of a total number of lumens reaching the working plane to the total number of lumens emitting from the source.

Important Point:

Maintenance factor: It is defined as the ratio of illumination under normal working conditions to the illumination when everything is clean.

Its value is always less than 1, and it will be around 0.8. This is due to the accumulation of dust, dirt, and smoke on the lamps due to which they emit less light than that they emit when they are clean. Frequent cleaning of the lamp will improve the maintenance factor.

Depreciation factor: It is defined as the ratio of initial illumination to the ultimately maintained illumination on the working plane.

Depreciation factor = 1 / maintenance factor

Its value is always more than 1.

RRB JE EEE (CBT II) Mock Test- 1 - Question 96

200 V DC motor draws an armature current of 25 A. Its armature resistance is 0.8 ohm. The induced emf in the motor will be:

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 96 Concept

In a DC generator, generated emf is given by

Eg = Vt + IaRa

In a DC motor, back emf is given by

Eb = V – IaRa

Where, Ia is armature current

Ra is armature resistance

Calculation:

Armature current (Ia) = 25 A

Armature resistance (Ra) = 0.8 ohm

Voltage (V) = 200 V

Ea = V – IaRa = 200 – 25(0.8) = 180 V

RRB JE EEE (CBT II) Mock Test- 1 - Question 97

If a phase sequence indicator rotates clockwise for a phase sequence of RYB, then what happens when the phase sequence is changed to BRY

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 97

- If a phase sequence indicator rotates clockwise for a phase sequence of RYB if the phase sequence is changed to BRY It will rotate clockwise only because there is no change in phase sequence.

- The direction of AC motor can be reversed by interchanging any two of the three motor supply lines

- Let the phase sequence of the three-phase voltage applied to the stator winding is RYB

- If this sequence is changed to RBY, it is observed that the direction of rotation of the field is reversed i.e., the field rotates in the opposite direction

- However, the number of poles and the speed at which the magnetic field rotates remain unchanged

RRB JE EEE (CBT II) Mock Test- 1 - Question 98

The expansion of WAN is _________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 98 Computer networks may be classified on the basis of the geographical area in two broad categories.

1. Local Area Network (LAN):

- Networks used to interconnect computers in a single room, rooms within a building or buildings on one site are called LAN

- LAN links computers i.e. software and hardware, in the same area for the purpose of sharing information

- Usually, LAN links computers within a limited geographical area because they must be connected by a cable

2. Wide Area Network (WAN):

- Computer network spanning a regional, national or global area

- The distance between computers connected to WAN is larger

- Therefore the transmission mediums used are normally telephone lines, microwaves and satellite links

RRB JE EEE (CBT II) Mock Test- 1 - Question 99

Which of the following digital personal assistant used in Windows 10?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 99 Digital personal assistant

- A digital personal assistant is a software-based service that resides in the cloud, designed to help end users complete tasks online

- In 2015 Microsoft released Windows 10, which came with Cortana, a digital personal assistant like Apple’s Siri

- Alexa is a personal assistant developed by Amazon released in Nov 2017

- The Google Assistant is personal assistant developed by Google that is primarily available on mobile and smart home devices; It was first debuted in May 2016

RRB JE EEE (CBT II) Mock Test- 1 - Question 100

The pH of acid rain should always be less than

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 100 When the quantity of acids in the raining water is more than the average, then such rain is called 'Acid rain'.

We are aware that normally rainwater has a pH of 5.6. When the pH of the rainwater drops below 5.6, it is called acid rain.

Acid rain refers to the ways in which acid from the atmosphere is deposited on the earth’s surface. Oxides of nitrogen and sulphur which are acidic in nature can be blown by the wind along with solid particles in the atmosphere and finally settle down either on the ground as dry deposition or in water, fog and snow as wet deposition.

The bad effects of acid rain

- When acid rain falls and flows as groundwater to reach rivers, lakes etc, it affects plants and animal life in the aquatic ecosystem

- Acid rain is harmful to agriculture, trees and plants as it dissolves and washes away nutrients needed for their growth

- It causes respiratory ailments in human beings and animal

- It may also cause corrosion in many buildings bridges, monuments, fencing etc

- It causes irritation in the eyes and skin of human beings

- This rain reduces the lustre of the metals too

- Acid rain damages buildings and other structures made of stone or metal

- The Taj Mahal in India has been affected by acid rain

RRB JE EEE (CBT II) Mock Test- 1 - Question 101

If the capacitor of a single phase motor is short circuited_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 101 If the capacitor of a single phase motor is short circuited the motor will not start.
RRB JE EEE (CBT II) Mock Test- 1 - Question 102

Root locus is used to calculate____.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 102 Root locus is used to calculate Relative stability.
RRB JE EEE (CBT II) Mock Test- 1 - Question 103

A step up chopper has input voltage 110V and output voltage 150V: the value of duty cycle is-________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 103 For step up chopper,

Where, E0 = output voltage

Voltage

α = duty cycle

= 0.26

RRB JE EEE (CBT II) Mock Test- 1 - Question 104

Under which conditions an initially relaxed system does becomes unstable?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 104 Only if bounded i/p generates unbounded o/p, in these conditions an initially relaxed system becomes unstable.

BIBO – In this system bounded input produces bounded output. Usually these systems are considered as stable system. This kind of systems are also linear systems i. e. output is directly proportional to the input and at initial state zero output.

RRB JE EEE (CBT II) Mock Test- 1 - Question 105

Which type of charge carrier has the greatest mobility in semiconductor?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 105 Free electrons charge carrier has the greatest mobility in semiconductor.

NOTE- semiconductor is negative temp coeffient.

Semi conductor is made form 4th group element,like ge ,si.

RRB JE EEE (CBT II) Mock Test- 1 - Question 106

In Indus Valley Civilization, site Dholavira, has been located in which state of India?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 106 Dholavira is an archaeological site at Khadirbet in Bhachau Taluka of Kutch District, in the state of Gujarat in western India, and one of the two largest Harappan sites in India.
RRB JE EEE (CBT II) Mock Test- 1 - Question 107

Which binary value equals 2-2 ?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 107 2-2 = 0.25

Step 1: Multiply the fractional part by 2.

0.25 x 2 = 0.5

the whole number part of the result is the first binary digit to the right of the point.

Step 2: Discard whole number part and repeat step 1.

5 x 2 = 1.0

RRB JE EEE (CBT II) Mock Test- 1 - Question 108

Which among the following is the weakest base?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 108 Cl- ion is the weakest base. In chemistry, a weak base is a base that does not ionize fully in an aqueous solution.
RRB JE EEE (CBT II) Mock Test- 1 - Question 109

Which one of the following is not alkaline?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 109 Alkaline refers to a nutrient solution or growing media with a pH greater than 7. Alkaline soils are normally composed of various types of materials such as calcium carbonate. Highly alkaline soils are more prevalent in dry regions. Because soil pH is directly linked to nutrient availability, alkaline soils tend to have a deficiency in phosphorus, zinc, and iron. So sulphur is not an alkaline .
RRB JE EEE (CBT II) Mock Test- 1 - Question 110

find the resultant resistance when 3 resistance of 2 ohm each are connected as shown in the figure below.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 110 2 ohm resistance is connected in parallel with 2 resistances of 2 ohm each.

the resultant resistance =

= 1.33 Ohm

RRB JE EEE (CBT II) Mock Test- 1 - Question 111

Which test is not conducted on line conductor before energization and after installation?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 111 HV test is not conducted on line conductor before energization and after installation.
RRB JE EEE (CBT II) Mock Test- 1 - Question 112

Zener diode are used primarily as……

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 112 When the voltage applied across the diode is forward bias, then the Zener diode act as a normal diode,

Maintain output voltage constant. But during voltage across the diode is reverse bias, then diode act as Zener diode operates in the reverse blocking mode for maintaining output voltage stable.

Therefore Zener diode is called a voltage regulator.

RRB JE EEE (CBT II) Mock Test- 1 - Question 113

IGBT combines advantages of_____________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 113 IGBT process high i/p like MOSFET and has low on state power loss as in a BJT.

The IGBT combines the simple gate-drive characteristics of MOSFETs with the high-current and low-saturation-voltage capability of bipolar transistors. The IGBT combines an isolated-gate FET for the control input and a bipolar power transistor as a switch in a single device.

RRB JE EEE (CBT II) Mock Test- 1 - Question 114

In a.c system, the skin effect_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 114 All of the options are correct.

Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor.

RRB JE EEE (CBT II) Mock Test- 1 - Question 115

Overall efficiency of gas turbine is________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 115 Overall efficiency of gas turbine is less than diesel cycle efficiency.
RRB JE EEE (CBT II) Mock Test- 1 - Question 116

Ideal load factor should be________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 116 As high load factor is directly proportional to efficiency of the plant.
RRB JE EEE (CBT II) Mock Test- 1 - Question 117

Atomic power station of India, which is built completely indigenously?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 117 Madras Atomic Power Station (MAPS) located at Kalpakkam about 80 kilometers (50 mi) south of Chennai, India, is a comprehensive nuclear power production, fuel reprocessing, and waste treatment facility that includes plutonium fuel fabrication for fast breeder reactors (FBRs) is the only atomic power station in India that was built completely indigenously.
RRB JE EEE (CBT II) Mock Test- 1 - Question 118

Air Quality Early Warning System launched in Delhi can predict extreme air pollution alerts by how many hours in advance?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 118 Air Quality Early Warning System for Delhi was launched in Delhi by the Union Minister for Earth Sciences and Environment. The System can predict extreme air pollution events 72 hours in advance and give necessary alerts.
RRB JE EEE (CBT II) Mock Test- 1 - Question 119

Which one of following does not affect the sag?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 119 Temperature rise causes lengthening of conductor due to expansion, winds causes swing and produces pressure on conductor, as well as ice loading is a major factor affecting the sag.
RRB JE EEE (CBT II) Mock Test- 1 - Question 120

The wattmeter measures________ power.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 120 The wattmeter measures average power
RRB JE EEE (CBT II) Mock Test- 1 - Question 121

An XOR gate produces output only when two inputs are___________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 121 An XOR gate produces output only when two inputs are different.

XOR gate produces the result irrespective of the magnitude of the input. So, low or high input does not make any difference.

X Y OUTPUT

0 0 0

0 1 1

1 0 1

1 1 0

RRB JE EEE (CBT II) Mock Test- 1 - Question 122

For the process of electrolysis ,we require_______.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 122 Electrolysis is possible only if DC potential difference is applied to the electrode .It is because we are to attract ions of only one kind on each electrode.
RRB JE EEE (CBT II) Mock Test- 1 - Question 123

A transistor is ……………operated device.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 123 Input to the transistor is bias current &collecter to ground voltage.

Change in base current is main responsible for change in output of circuit volage and current.

There for BJT is current control device.

Note-FET is voltage control device

RRB JE EEE (CBT II) Mock Test- 1 - Question 124

The flux density B in a core having relative permeability μr and length l meters when I amperes of current flows in its N turn windings is_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 124

Electric Flux Density is the amount of electric flux, the number of "lines," passing through a

given area. Units are Gauss/square meter.

RRB JE EEE (CBT II) Mock Test- 1 - Question 125

Synchronous motors are generally used in application requiring_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 125 Synchronous motors are generally used in application requiring infrequent starting.

For variable speed applications, DC motors are used as they could provide the wide range of speed.

Whereas, Induction motors are used for frequent start and stop applications.

RRB JE EEE (CBT II) Mock Test- 1 - Question 126

The B – H curve of _______ will not be straight line.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 126 The B – H curve of soft iron will not be straight line.

curve between current and flux is linear for good conductor & non linear for bad conductor.

linearity decreasing order

air> copper> silicon steel>soft iron.

RRB JE EEE (CBT II) Mock Test- 1 - Question 127

An alternating voltage or current is a___________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 127 AC current is certainly not a scalar quantity.

The quantity represented by value and displacement is termed as Phasor whereas the one represented by value and direction is termed as the vector quantity.

Because it act like rotating vector so it is Phasor quantity and not vector.

RRB JE EEE (CBT II) Mock Test- 1 - Question 128

Which of the following enjoys the legal supremacy in India?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 128 Constitution enjoys legal supremacy because it derives authority from the people and all the provisions of law enables from the constitution. All laws are subordinate to the constitution and it acts as a connecting link between the State and common people.
RRB JE EEE (CBT II) Mock Test- 1 - Question 129

Mac OS was introduced by-

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 129 macOS previously Mac OS X and later OS X) is a series of graphical operating systems developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac family of computers. Within the market of desktop, laptop and home computers, and by web usage, it is the second most widely used desktop OS, after Microsoft Windows.[8][9]
RRB JE EEE (CBT II) Mock Test- 1 - Question 130

Which of the following is NOT a cause of air pollution?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 130 Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions. It can have harmful effects on plants, aquatic animals and infrastructure. But it is not a cause of air pollution.
RRB JE EEE (CBT II) Mock Test- 1 - Question 131

The D.C armature resistance of a delta connected alternator measured across its two terminates is 1Ω. The per phase DC resistance is________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 131

RRB JE EEE (CBT II) Mock Test- 1 - Question 132

The superposition theorem applies to________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 132 As superposition principal is applicable for linear,active, bi lateral network.

Current & voltage are linear to each other.

but power = I2 x R

Power is direct propositional to square of current , which is non linear.

There for it is applicable only for current &voltage calculation.

RRB JE EEE (CBT II) Mock Test- 1 - Question 133

Permissible pH value of water for the boiler is­­­_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 133 Permissible pH value of water for the boiler is slightly more than 7.

Natural water is usually between 6.5 and 7.5 pH. A common recommendation is to maintain boiler water at 8.5 pH.Acidic water is corrosive. Alkalinic water is more prone to scaling.Alkalinity is a measure of the bicarbonate (HCO3) , carbonate (CO3) and hydroxyl (OH) ions in the water.

RRB JE EEE (CBT II) Mock Test- 1 - Question 134

The forward voltage drop across a silicon diode is about_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 134 The forward voltage drop across a silicon diode is about 0.7V during forward bias.

during reverse bias it act as open circuit.it offer infinity resistance.

AND for ge diode is about 0.3v.silicon diode has greater thermal stability than ge diode.

RRB JE EEE (CBT II) Mock Test- 1 - Question 135

If, |Z|>1 for K>0 then z-1[E/(Z2 + 1)] is

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 135 f(z) = z/(z+1)

therefore;

z-1[f(z)] = sin(π/2)k

RRB JE EEE (CBT II) Mock Test- 1 - Question 136

For insulation resistance test of 11v insulator what should be voltage range of 5WHV megger?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 136 For insulation resistance test of 11v insulator 5000V is voltage range of 5WHV megger.
RRB JE EEE (CBT II) Mock Test- 1 - Question 137

A crystal diode is__________ device.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 137 The V-I characteristics of crystal diode is non-linear.
RRB JE EEE (CBT II) Mock Test- 1 - Question 138

High speed alternators are driven by_____________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 138 An alternator with small diameter and large length of rotor bar is used for high speed Aplication.this type of rotor is driven by stream turbine.

The alternator with large diameter and small length of rotor is used for low speed aplication.This type of rotor is driven by hydraulic or diesel engine.

RRB JE EEE (CBT II) Mock Test- 1 - Question 139

Transistor turn off time is_______.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 139 Device turn off time= storage time + fall time.

Circuit turn off time is always greater than device turn off time.

Becouse gate circuit require some time recovery purpose.

For proper circuit operation.otherwise it turn on any time.this is causes maloparation of circuit.

Circuit turn off time =device turn off time+gate recovery time.

RRB JE EEE (CBT II) Mock Test- 1 - Question 140

What title did the British confer Gandhi with, which was relinquished by him?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 140 Its most famous recipient is Mohandas Gandhi, who was awarded the Kaisar-i-Hind in 1915 by The Lord Hardinge of Penshurst for his contribution to ambulance services in South Africa. Gandhi returned the medal in 1920 as part of the national campaign protesting the Jallianwala Bagh massacre and in support of the Khilafat Movement
RRB JE EEE (CBT II) Mock Test- 1 - Question 141

If area of hysteresis loop of a material is large, the hysteresis loss in the material will be________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 141 If area of hysteresis loop of a material is large, the hysteresis loss in the material will be Large.

Hysteresis loss is directly proportional to the area under the curve on B-H axis.

RRB JE EEE (CBT II) Mock Test- 1 - Question 142

The capacitance of reversed biased junction J2 in thyristor is Cj2 = 20 pf and can be assumed to be independent of the off side voltage. The limiting value of the charging current to turn on the thyristor is 16mA. What is critical value of dv/dt?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 142 Cj2 = 20pf, IJ2 = 16mA

Then = 800 V/us

RRB JE EEE (CBT II) Mock Test- 1 - Question 143

The curie temperature of iron is___________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 143 The μr value of a ferromagnetic material depends upon temperature, μrthe decreases with increase in temperature and at critical temperature ‘curie temperature’ the ferromagnetic material becomes paramagnetic. The curie temperature of iron is 770 degreesdegree Celsius.
RRB JE EEE (CBT II) Mock Test- 1 - Question 144

The rotor of the hysteresis motor is made of magnetic material having area of hysteresis loop_____.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 144 The rotor of hysteresis motor is made of magnetic material with a very large hysteresis loophaving area of hysteresis loop very large.

The rotorRotor of the hysteresis motor is made of hardeningharden steel with high retentivity.

High retentivity is responsible for a large hysteresis loop on B-H curve.

RRB JE EEE (CBT II) Mock Test- 1 - Question 145

Velocity of sound waves in air is 330 m/s. For a particular sound wave in air, a path difference of 40 cm is equivalent to phase difference of 1.6π . The frequency of this wave is-

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 145 From

RRB JE EEE (CBT II) Mock Test- 1 - Question 146

__________ is used as a programming language in first generation computers?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 146 A first generation (programming) language (1GL) is a grouping of programming languages that are machine level languages used to program first-generation computers.
RRB JE EEE (CBT II) Mock Test- 1 - Question 147

The radiation emitted by black bodies is explained by_______?

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 147 The radiation emitted by black bodies is explained by Quantum Theory
RRB JE EEE (CBT II) Mock Test- 1 - Question 148

The reluctance of magnetic circuit varies as_________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 148 Reluctance=length of wire/area x permeability

Reluctance, therefore reluctance varies as length/ Area.

RRB JE EEE (CBT II) Mock Test- 1 - Question 149

A GTO can be turned on by applying______________.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 149 GTO is a four layer, three junction semiconductor device with three external terminals (anode, cathode,the and gate), and it can be turned ON or OFF by applying positive or negative pulse signal respectively to the gate terminal.
RRB JE EEE (CBT II) Mock Test- 1 - Question 150

For the same rating, the size of 1Φ IM is about______that of 3Φ IM.

Detailed Solution for RRB JE EEE (CBT II) Mock Test- 1 - Question 150 Due to the size of the stator winding for same rating compare to 3Ø motor is more
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