Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  RRB JE Electrical (CBT II) Mock Test- 5 - Electrical Engineering (EE) MCQ

RRB JE Electrical (CBT II) Mock Test- 5 - Electrical Engineering (EE) MCQ


Test Description

30 Questions MCQ Test - RRB JE Electrical (CBT II) Mock Test- 5

RRB JE Electrical (CBT II) Mock Test- 5 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The RRB JE Electrical (CBT II) Mock Test- 5 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The RRB JE Electrical (CBT II) Mock Test- 5 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for RRB JE Electrical (CBT II) Mock Test- 5 below.
Solutions of RRB JE Electrical (CBT II) Mock Test- 5 questions in English are available as part of our course for Electrical Engineering (EE) & RRB JE Electrical (CBT II) Mock Test- 5 solutions in Hindi for Electrical Engineering (EE) course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt RRB JE Electrical (CBT II) Mock Test- 5 | 150 questions in 120 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study for Electrical Engineering (EE) Exam | Download free PDF with solutions
RRB JE Electrical (CBT II) Mock Test- 5 - Question 1

The ripple factor in case of a full wave rectifier-

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 1

Ripple factor may be defined as the ratio of the root mean square (rms) value of the ripple voltage to the absolute value of the DC component of the output voltage, usually expressed as a percentage. It is expressed as peak to peak value.

Now for the full wave rectifier,

RMS value= Vm/1.414

Avg. Value= 2*Vm/3.14

Ripple factor = rms/avg = 0.48

RRB JE Electrical (CBT II) Mock Test- 5 - Question 2

Magnetic reluctance, or magnetic resistance can be expressed as

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 2

The total reluctance is equal to the ratio of the MMF in a passive magnetic circuit and the magnetic flux in this circuit. In an AC field, the reluctance is the ratio of the amplitude values for a sinusoidal MMF and magnetic flux.
R = F/Φ

1 Crore+ students have signed up on EduRev. Have you? Download the App
RRB JE Electrical (CBT II) Mock Test- 5 - Question 3

Where was All India Muslim League formed?

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 3

On December 30, 1906, Muslim league was formed under the leadership of Aga Khan, the Nawab of Dhaka.

RRB JE Electrical (CBT II) Mock Test- 5 - Question 4

For an N-channel FET, what is the direction of current flow?

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 4

When a voltage greater than pinch off is applied, the current starts flowing from drain to source. Pinch off voltage is the drain to source voltage after which the drain to source current becomes almost constant and JFET enters into saturation region and is defined only when gate to source voltage is zero

RRB JE Electrical (CBT II) Mock Test- 5 - Question 5

Deflecting torque is ________ quantity under measurement in PMMC instruments.

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 5

In PMMC instruments, the deflecting torque is given by

Td = BINA

Where Td = Deflecting torque in N-m

B = Flux density, wb/m2

I = Current in the Coil, amperes

N = Number of turns of the coil

A = Effective coil area m2

Deflecting torque is directly proportional to current.

RRB JE Electrical (CBT II) Mock Test- 5 - Question 6
What is the "Glory of Allapalli"?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 6
Glory of Allapalli is a dense forest strip in Naxalite Gadchiroli district in Maharashtra which has been notified as first biodiversity heritage site to empower government under biodiversity act 2002.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 7
Find the divergence of the vector field given by
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 7
divergence of F =
=
= z + z + 0 = 2z
RRB JE Electrical (CBT II) Mock Test- 5 - Question 8
What happens due to high di/dt?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 8
High di/dt causes localized heat generation. Due this could lead to localized “hot-spot” heating and device may fail to operate.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 9
Which type of charge carrier has the greatest mobility in semiconductor?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 9
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 Electrical (CBT II) Mock Test- 5 - Question 10
A transistor is ……………operated device.
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 10
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 Electrical (CBT II) Mock Test- 5 - Question 11
The most common and best bridge method for precise measurement of inductance over a wide range is
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 11

Maxwell’s inductance capacitance bridge is used for the measurement of an inductance of medium Q coils.

Hay’s bridge is used to measure for the measurement of an inductance of high Q coils.

Anderson Bridge is the most common and best bridge method for precise measurement of inductance over a wide range.

Wein Bridge is used to measure the frequency.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 12

To determine the polarity of the voltage drop across a resistor, it is necessary to know.

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 12

To determine the polarity of the voltage drop across the resistor, it is necessary to know the direction of the current through the resistor.

The terminal entering the current gives a positive sign of voltage drop.

RRB JE Electrical (CBT II) Mock Test- 5 - Question 13
Which of the following prizes is given for fiction?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 13
The Man Booker Prize for Fiction is a literary prize awarded each year for the best original novel written in the English language and published in the UK.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 14
Which of the following transformer will be largest in size:
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 14

For a fixed kVA rating, more the designed frequency of transformer then lesser will be cross sectional area of the core. Hence lesser will be the size and weight of transformer.

All the transformers given in the options have same kVA rating. Hence the transformer with lowest designed frequency has largest size.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 15

The colour of methyl orange in basic medium is:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 15

The colour of different pH indicators in different mediums is summarized in the table below:

RRB JE Electrical (CBT II) Mock Test- 5 - Question 16

In the armature-voltage control method of speed control of a DC shunt motor, as the speed is increased:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 16

In the armature-voltage control method of speed control of a DC shunt motor, as the speed is increased the torque remains constant and the power increases which is shown in above figure.

RRB JE Electrical (CBT II) Mock Test- 5 - Question 17
The gate voltage in a JFET at which drain current becomes zero is called
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 17

The gate voltage in a JFET at which drain current becomes zero is called pinch-off voltage

Pinch off voltage:

  • It is the drain to source voltage after which the drain to source current becomes almost constant and JFET enters saturation region and is defined only when gate to source voltage is zero
RRB JE Electrical (CBT II) Mock Test- 5 - Question 18
Potentiometer sensitivity can be decreased by
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 18

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 can be measured using the potentiometer. It can be decreased by increasing its potential gradient. Thus, it can be decreased by following methods.

1) By decreasing 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 increased by increasing the current in the circuit by varying rheostat.

RRB JE Electrical (CBT II) Mock Test- 5 - Question 19

Sewage pollutant can cause

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 19

RRB JE Electrical (CBT II) Mock Test- 5 - Question 20

The author of the book “To Kill a Mockingbird” died at an age of 89. She was _______.

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 20

Harper Lee was the author of the book “To kill a Mockingbird” who died at an age of 89 in 2016.

RRB JE Electrical (CBT II) Mock Test- 5 - Question 21
Who has been appointed as Managing Director and Chief Financial Officer of the World Bank in July 2019?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 21
  • Anshula Kant, Managing Director of the State Bank Of India, has been appointed as Managing Director and Chief Financial Officer of the World Bank.
  • She will be responsible for financial and risk management of the World Bank Group.
  • Anshula brings more than 35 years of expertise in finance, banking, and innovative use of technology through her work as CFO of the State Bank of India.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 22
Given J is the current density at a given location in a resistive material, E is the electric field at that location, and σ is a material-dependent parameter called the conductivity, Ohm’s law can be expressed as ____
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 22

Given J is the current density at a given location in a resistive material, E is the electric field at that location, and σ is a material-dependent parameter called the conductivity, Ohm’s law can be expressed as

J = σE

Where,

j → is the current density

E → is the electric field inside the conductor

And σ is the electrical a conductivity of the material

RRB JE Electrical (CBT II) Mock Test- 5 - Question 23

In armature control method, back emf (Eb) of DC motor is directly proportional to ________.

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 23

An armature control method is used in the DC shunt motor.
In a DC motor, the back emf is directly proportional to speed and flux.
Eb ∝ Nϕ
Where N is speed and ϕ is flux.|
In a DC shunt motor, flux is constant.
So, the back emf is directly proportional to speed.
Important Point:
Armature resistance control:
We know that,
N ∝ Eb
N ∝ V- I a(Ra + R)/ø
We can control the speed by increasing armature resistance. This method gives only below base speeds. This method is a constant torque and variable power drive.
Field control method:
We know that
N ∝ Eb
N ∝ V- I a(Ra + R)/ø
By varying flux, we can increase the speed more than its base speed. This method is constant power and variable torque drive.
The characteristics are shown below

RRB JE Electrical (CBT II) Mock Test- 5 - Question 24

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

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 24

Concept:
We know that
P = V2/R
Here P = Power, V = Voltage, R = Resistance
Calculation:
R = 2302/100 = 529 Ω

RRB JE Electrical (CBT II) Mock Test- 5 - Question 25

What does the fourth colour band on a resistor mean?

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 25

The four band colour code is the most common variation. These resistors have two bands for the resistance value, one multiplier and one tolerance band

RRB JE Electrical (CBT II) Mock Test- 5 - Question 26

A milliammeter of resistance 100 Ω is connected in series with a circuit. Its power consumption is 0.1 mW. Supposing it is replaced with a milliammeter of 200 Ω resistance, the power consumed will be:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 26

We known that
Power = I2R

Now milliammeter resistance = 200
∴ Power consumed = I2R = 1 × 10-3 × 200 = 0.2 mW

RRB JE Electrical (CBT II) Mock Test- 5 - Question 27
The diode in which impurities are heavily doped is
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 27
  • The diode in which impurities are heavily doped is Tunnel diode
  • Tunnel diode owing to heaving doping (typically 100 to several thousand times normal doping semiconductor diode) resulting in extremely small depletion layer width
  • Due to this extremely thin depletion region width the charge carriers can “tunnel" through depletion region
RRB JE Electrical (CBT II) Mock Test- 5 - Question 28
The purpose of providing dummy coils in dc machine armature is to
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 28

Dummy coils:

  • The wave winding is possible only with number of conductor or coils.
  • But sometimes the armature slots available in the armature winding do not meet the requirement of the winding. (It means that the available number of slots is more than the required number of conductors).
  • Some slots are kept without armature winding in that case and dummy coil or coils are employed in that slots.
  • The dummy coils are similar to other coils except their ends are cut, short and taped. They do not connect with the commutator bars.
  • The dummy coils are simply to provide mechanical balance for the armature.
  • As they do not connect with commutator bars, they do not affect the electrical characteristics of the winding.
RRB JE Electrical (CBT II) Mock Test- 5 - Question 29

The reaction in which ester is treated with an alkali to obtain carboxylic acid and alcohol is called:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 29

Concept:

  • Esters are sweet-smelling substances.
  • These are used in making perfumes and as flavouring agents.
  • Esters react in the presence of an acid or a base to give the alcohol and salt.
  • This reaction is known as saponification because it is used in the preparation of soap

Underlying reaction:
CH3COOC2H5 + NaOH → C2H5OH + CH3COONa

RRB JE Electrical (CBT II) Mock Test- 5 - Question 30
__________ is done to improve efficiency and reliability of dc generator.
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 5 - Question 30

The advantages of the parallel operation of DC generators are -

Continuity of service: If a single large generator is used in the power plant, then in case of its breakdown, the whole plant will be shut down. If power is supplied from a number of small units operating in parallel, then in case of failure of one unit, the continuity of supply can be maintained by other healthy units.

Efficiency: Generators run most efficiently when loaded to their rated capacity. Electric power costs less per kWh when the generator is efficiently loaded. Therefore, when load demand on power plant decreases, one or more generators can be shut down and the remaining units can be efficiently loaded.

Increase Plant Capacity: The demand for electricity is increasing day by day. To meet the requirement of power generation, an additional new unit can run in parallel with the running units.
View more questions
Information about RRB JE Electrical (CBT II) Mock Test- 5 Page
In this test you can find the Exam questions for RRB JE Electrical (CBT II) Mock Test- 5 solved & explained in the simplest way possible. Besides giving Questions and answers for RRB JE Electrical (CBT II) Mock Test- 5, EduRev gives you an ample number of Online tests for practice

Top Courses for Electrical Engineering (EE)

Download as PDF

Top Courses for Electrical Engineering (EE)