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RRB JE Electrical (CBT II) Mock Test- 1 - Electrical Engineering (EE) MCQ


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30 Questions MCQ Test RRB JE Mock Test Series Electrical Engineering 2025 - RRB JE Electrical (CBT II) Mock Test- 1

RRB JE Electrical (CBT II) Mock Test- 1 for Electrical Engineering (EE) 2024 is part of RRB JE Mock Test Series Electrical Engineering 2025 preparation. The RRB JE Electrical (CBT II) Mock Test- 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The RRB JE Electrical (CBT II) Mock Test- 1 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- 1 below.
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RRB JE Electrical (CBT II) Mock Test- 1 - Question 1

A source of frequency of 800 Hz emits waves of wavelength 0.5 m, how long does the waves take to travel 400 m?

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

v = 800Hz, λ = 0.5 m
v = nλ = 800 x 0.5 = 400m/s
Time = 400/400 = 1sec

RRB JE Electrical (CBT II) Mock Test- 1 - Question 2

The centrifugal switch in a single phase motor _________ of the motor.

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

A single phase motor has two windings: main winding and auxiliary winding. These both windings are placed on stator. Motor has a centrifugal switch inside its case, attached to the motor shaft.

The centrifugal switch turns on a circuit, providing the needed boost to start the motor. Once the motor comes up to its operating speed, the switch turns off (disconnects auxiliary winding) the boost circuit, and the motor runs normally.

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

The V-I characteristic of a resistor is I = 2V2. The resistor is

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 3

Given resistor is a active element.
Given that, I = 2V2.
Given V-I characteristic represents non-linear relation between current and voltage.

RRB JE Electrical (CBT II) Mock Test- 1 - Question 4

Least suitable transducer for static pressure measurement is-

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

A pressure transducer is used to convert a certain value of pressure into its corresponding mechanical or electrical output.

The transducers used for static pressure measurement are

Semi-conductor strain gauge

Variable capacitor for transducer

Piezoelectric transducer

Metal wire strain gauge is least suitable for static pressure measurement.

RRB JE Electrical (CBT II) Mock Test- 1 - Question 5
Atomic power station of India which is built completely indigenously?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 5
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 Electrical (CBT II) Mock Test- 1 - Question 6
For the process of electrolysis ,we require_______.
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 6
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 Electrical (CBT II) Mock Test- 1 - Question 7
Which of the following is the information retrieval service?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 7
  • The internet is a globally connected network system that transmits data via various types of media; Sometimes it is referred to as a ‘network of networks’
  • The World Wide Web, or simply web, is a way of accessing information over the medium of the internet
  • A web browser is a software application for accessing information on the World Wide Web
RRB JE Electrical (CBT II) Mock Test- 1 - Question 8
What is peak factor of a sinusoidal wave?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 8

Peak factor is defined as the ratio of peak value to rms value

Peak value of sinusoidal value = √2 × rms value

Peak factor of a sinusoidal value = √2 = 1.414
RRB JE Electrical (CBT II) Mock Test- 1 - Question 9
To measure insulation resistance of equipment’s of voltage rating up to 440 V the megger generator must generate
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 9
To measure insulation resistance of equipment’s of voltage rating up to 440 V the megger generator must generate the voltage more than the voltage rating of equipment. Hence the answer should be 500 V.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 10
Main purpose of using oil in oil circuit breaker is to:
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 10

In the oil circuit breaker, oil is used as a dielectric or insulating medium for arc extinction. In oil circuit breaker the contacts of the breaker are made to separate within an insulating oil.

Advantages of oil as an arc quenching:

  • The oil has high dielectric strength and provides insulation between the contacts after the arc has been extinguished
  • Oil provides a small clearance between the conductors and the earth components
  • The hydrogen gas is formed in the tank which has a high diffusion rate and good cooling properties
RRB JE Electrical (CBT II) Mock Test- 1 - Question 11

Reluctance of magnetic path is:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 11

Reluctance opposes the passage of magnetic flux lines. Reluctance is analogous to resistance.
We can define the reluctance as,
R = mmf/0
We know that, 
Where H is field strength
N is the number of turns in a coil
l is mean length of flux in a magnetic circuit
I is current through the coil
The flux in a magnetic circuit is given by
ø = BA
= μHA

Now, we can define reluctance as

RRB JE Electrical (CBT II) Mock Test- 1 - Question 12

Which among the following is/are output devices?

I. Scanner

II. Speaker

III. Plotter

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 12
An input device is any hardware device that sends data to a computer, allowing you to interact with and control it.
An output device is any hardware that sends data from a computer to another device mostly in form of audio or video.
  • Scanner scans any document and sends it to computer, so it is a input device.
  • Speaker gets data from computer in form of audio. So it is a output device.
  • Plotter is printer that print vector image. It recieve data from computer and print it on paper. So it is also a output device.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 13
Which of the following is the main constituent of Biogas after Methane?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 13
  • Methane and Carbon dioxide are the main constituent of Biogas.
  • Methane is produced by the anaerobic bacterial decomposition of vegetable matter under water.
  • It is also known as marsh gas or swamp gas.
  • Its chemical formula is CH4.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 14

The voltage transformation ratio of a transformer is equal to the ration of:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 14

In transformers, voltage transformation ratio is the ratio of secondary induced emf to primary induced emf.
K = E2/E1 = N2/N1 = I1/I2

RRB JE Electrical (CBT II) Mock Test- 1 - Question 15

Comparing same size single-phase induction motors, which one of the following has the highest starting torque?

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 15

As compared to all motor, a capacitor start motor has higher starting torque because capacitor start motors employs a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings.

The order of starting torque in the increasing order is: Shaded-pole motor < Split phase motor < Capacitor start capacitor run motor < Capacitor start motor

RRB JE Electrical (CBT II) Mock Test- 1 - Question 16

If we increase the current sensitivity of a galvanometer the voltage sensitivity will

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 16

Current sensitivity: The current sensitivity of a galvanometer is defined as the deflection produced by unit current.
Current sensitivity Si = G/500K mm/ μ A
Where G = NBA is a displacement constant and
K is a control constant
N = number of turns
B = flux density
A = Area
Voltage sensitivity: The voltage sensitivity is the deflection in scale divisions per unit voltage impressed on the galvanometer.
Voltage sensitivity Sv = G/500KRg mm/ μV
Where R resistance of coil
Method to increase sensitivity:
The current sensitivity can be increased by increasing the number of turns, using high flux density and by increasing the dimensions of coil.
For a given coil area (A) and a constant value of flux density (B), the displacement constant (G) can be increased by increasing the number of turns.
If the winding area is fixed, a large number of turns can only be wound by using a thin wire. Thus, we can increase the sensitivity of a galvanometer by winding its coil with large number of turns of thin fine wire.
However, this increases the resistance of the coil (Rg) also as resistance is proportional to length of conductor).
As voltage sensitivity depends on resistance of the coil, we need to consider the two effects i.e. increase in the value of displacement constant (G) and increase in the resistance (Rg).
So, current sensitivity is increasing but the voltage sensitivity may increase or decrease.

RRB JE Electrical (CBT II) Mock Test- 1 - Question 17
Which of the following is the disadvantage of electric traction over other systems of traction?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 17

Drawbacks of electric traction system:

  • Electric traction system involves high erection cost of power system
  • Interference causes to the communication lines due to the overhead distribution networks
  • The failure of power supply brings whole traction system to stand still
  • In an electric traction system, the electrically operated vehicles must move only on the electrified routes
  • Additional equipment should be needed for the provision of regenerative braking, it will increase the overall cost of installation
RRB JE Electrical (CBT II) Mock Test- 1 - Question 18
Due to a small area of hysteresis loop and small residual magnetism _________ is used for transformers, AC machines etc.
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 18
  • Due to a small area of hysteresis loop and small residual magnetism steel sheet is used for transformers, AC machines etc.
  • Materials with a large hysteresis loop are used for producing permanent magnets
  • Such a hysteresis loop represents a large residual flux and hence a large coercive force
  • Hence materials such as the hard steel with some tungsten, cobalt or chromium are used for such an application
RRB JE Electrical (CBT II) Mock Test- 1 - Question 19
The frequency of emf generated by a generator depends upon its:
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 19

We know that

Here P = number of pole, N = Speed, f = frequency

The frequency of emf generated by a generator depends upon its speed and number of poles.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 20
If N is the speed, then the windage loss in dc motor is proportional to
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 20
  • If N is the speed, then the windage loss in dc motor is proportional to square of armature speed
  • Windage losses occur due to the air inside the rotating coil of the machine
  • Eddy current losses are proportional to square of speed.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 21
The Central Processing Unit (CPU) consists of:
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 21
  • A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logic, controlling, and input/output (I/O) operations specified by the instructions.
  • RAM and cache are example of primary storage. Cache is a part of central processing unit.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 22
State Land Reform is under which schedule of the Indian Constitution?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 22
  • The first amendment to the Indian Constitution added the Ninth Schedule to it in 1951.
  • It ensured that the laws related to land reforms were not challenged in courts for violation of fundamental rights.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 23

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The correct observation is:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 23

Concept:
The reaction of Zn and HCl is example of displacement reaction.

When a more reactive element displaces a less reactive element from its compound then that is known as displacement reaction. Both metals and nonmetals take part in displacement reactions
Application:
The underlying reaction between hydrochloric acid and granulated zinc is :
Zn + 2HCl → ZnCl2 + H2
From the above reaction the gas released is H2
H2 is colourless odourless gas which burns with a popping sound.

RRB JE Electrical (CBT II) Mock Test- 1 - Question 24

Consider a situation where a particular laboratory has several resisters of 100 Ω only. Which of the following combinations is the best for replacing a 150 Ω resistor in a circuit using the resistors available in the laboratory?

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 24

Two 100 Ω resistors are connected in parallel
R100║100 = 100 x100/200 =  50 Ω

RAB = 100 + 50 = 150 Ω

Two in parallel and one in series combinations is the best for replacing a 150 Ω resistor in a circuit using 100 Ω in the laboratory.

RRB JE Electrical (CBT II) Mock Test- 1 - Question 25

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 Electrical (CBT II) Mock Test- 1 - Question 25

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 Electrical (CBT II) Mock Test- 1 - Question 26
Which of the following statements regarding reluctance start motor is incorrect?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 26
  • Reluctance start motor is a type of synchronous motor.
  • The reluctance motor has basically two main parts called stator and rotor.
  • The stator has a laminated construction, made up of stampings.
  • The stampings are slotted on its periphery to carry the winding called stator winding.
  • The stator carries only one winding and it is excited by single-phase AC supply.
  • The rotor has a particular shape. Due to its shape, the air gap between stator and rotor is not uniform.
  • Its working principle is similar to a shaded pole motor.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 27
If the voltage-current characteristics is a straight line through the origin, then the element is said to be?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 27

Linear Elements: A linear element is one whose parameters do not change with voltage or current. It has primarily two properties: homogeneity and additivity.

Example: Resistor, Inductor, Capacitor

Nonlinear Elements: A nonlinear element is that whose parameters change with voltage or current. It does not obey homogeneity and additive properties.

Example: Diode, Transistor

A circuit is linear if and only if its input and output can be related by a straight line passing through the origin otherwise, it is a nonlinear system.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 28

The magnification of the lens is defined as the ratio of:

Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 28

Magnification of a lens is defined as the ratio of the height of the image to the height of the object.
m = h/[?]
h' = Height of the image
h = Height of the object

RRB JE Electrical (CBT II) Mock Test- 1 - Question 29
Which of the following single-phase motors have relatively poor starting torque?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 29

The capacitor motor develops relatively poor starting torque when compared to universal motor and repulsion motor. To obtain a high starting torque, the two conditions are essential.

  • The starting capacitor value must be large
  • The value of the starting winding resistance must be low

Important Point:

  • The electrolytic capacitors of the order of the 250 µF are used in capacitor motors because of the high Var rating of the capacitor requirement
  • Universal motors are generally series wound (armature and field winding are in series), and hence produce high starting torque
  • Universal motors find their use in various home appliances like vacuum cleaners, drink and food mixers, domestic sewing machine, etc.
  • The higher rating universal motors are used in portable drills, blenders, etc.
  • Repulsion motor is used for loads requiring high starting torque such as hoists, lifts, etc.
RRB JE Electrical (CBT II) Mock Test- 1 - Question 30
Which one of the following materials cannot be used for permanent magnets?
Detailed Solution for RRB JE Electrical (CBT II) Mock Test- 1 - Question 30
Of the given material, only iron cobalt alloy cannot be used to make permanent magnets.
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