Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 86 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

51.

For long distance transmission the transformer used is_____________?
A. Step down
B. Input voltage and output voltage remain same
C. Step up
D. Amplifier is used
Answer» D. Amplifier is used
Discussion
52.

Which one of the following devices does not function like an electric motor ?
A. Galvanometer
B. Ammeter
C. Voltmeter
D. Transformer
Answer» E.
Discussion
53.

When the motor is at its maximum speed then back emf will be______________?
A. Maximum
B. Zero
C. Intermediate values
D. No back emf
Answer» B. Zero
Discussion
54.

An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?
A. Induced current
B. Eddy current
C. Back emf
D. None of the above
Answer» C. Back emf
Discussion
55.

Long distance transmission is easy for________________?
A. D.C voltage
B. A.C voltage
C. Half A.C voltage
D. Half D.C voltage
Answer» C. Half A.C voltage
Discussion
56.

The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?
A. 3-Jan
B. 3
C. 1
D. 6
Answer» C. 1
Discussion
57.

An open coil has_____________?
A. zero resistance and inductance
B. infinite resistance and zero inductance
C. infinite resistance and normal inductance
D. zero resistance and high inductance
Answer» C. infinite resistance and normal inductance
Discussion
58.

A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is___________?
A. 3500 mH
B. 350 mH
C. 250 mH
D. 150 mH
Answer» C. 250 mH
Discussion
59.

A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
A. 0 volt
B. 3.125 volt
C. 31.25 volt
D. 0.03125 volt
Answer» E.
Discussion
60.

Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
A. 5 mH
B. 10 mH
C. 5 H
D. 10 H
Answer» D. 10 H
Discussion
61.

A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?
A. 50 N
B. 120 N
C. 240 N
D. 480 N
Answer» C. 240 N
Discussion
62.

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?
A. 6 mH
B. 14 mH
C. 24 mH
D. 48 mH
Answer» E.
Discussion
63.

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?
A. 4 mH
B. 5 mH
C. 6 mH
D. 12 mH
Answer» D. 12 mH
Discussion
64.

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?
A. 2.0
B. 1.0
C. 0.5
D. zero
Answer» C. 0.5
Discussion
65.

For a purely inductive circuit which of the following is true ?
A. Apparent power is zero
B. Relative power is.zero
C. Actual power of the circuit is zero
D. Any capacitance even if present in the circuit will not be charged
Answer» D. Any capacitance even if present in the circuit will not be charged
Discussion
66.

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?
A. 32 mH
B. 38 mH
C. 40 mH
D. 48 mH
Answer» C. 40 mH
Discussion
67.

Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
A. 100 N
B. 400 N
C. 600 N
D. 1000 N
Answer» B. 400 N
Discussion
68.

In case of an inductance, current is proportional to___________?
A. voltage across the inductance
B. magnetic field
C. both A. and B.
D. neither (A) nor (B)
Answer» C. both A. and B.
Discussion
69.

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?
A. 3 mH
B. 12 mH
C. 24mH
D. 48mH
Answer» B. 12 mH
Discussion
70.

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?
A. 64 A/s
B. 32 A/s
C. 16 A/s
D. 4 A/s
Answer» E.
Discussion
71.

Two 300 uH coils in series without mutual coupling have a total inductance of___________?
A. 300 uH
B. 600 uH
C. 150 uH
D. 75 uH
Answer» B. 600 uH
Discussion
72.

Which of the following is unit of inductance ?
A. Ohm
B. Henry
C. Ampere turns
D. Webers/metre
Answer» C. Ampere turns
Discussion
73.

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?
A. 20 Wb
B. 2 Wb
C. 0.2 Wb
D. 0.02 Wb
Answer» E.
Discussion
74.

Which of the fpllowing inductor will have the least eddy current losses ?
A. Air core
B. Laminated iron core
C. Iron core
D. Powdered iron core
Answer» B. Laminated iron core
Discussion
75.

A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
A. 0.01 s
B. 0.1 s
C. 0.5 s
D. 5 s
Answer» D. 5 s
Discussion
76.

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?
A. 10 V
B. 15 V
C. 25V
D. 50V
Answer» D. 50V
Discussion
77.

A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?
A. 50 ohms
B. 500 ohms
C. 1000 ohms
D. 5000 ohms
Answer» E.
Discussion
78.

Which of the following circuit elements will oppose the change in circuit current ?
A. Capacitance
B. Inductance
C. Resistance
D. All of the above
Answer» C. Resistance
Discussion
79.

As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?
A. lies perpendicular to the magnetic flux
B. lies in a magnetic field
C. cuts magnetic flux
D. moves parallel to the direction of the magnetic field
Answer» D. moves parallel to the direction of the magnetic field
Discussion
80.

Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
A. 6 H
B. 8 H
C. 12 H
D. 24 H
Answer» D. 24 H
Discussion
81.

Lenz’s law is a consequence of the law of conservation of__________?
A. induced current
B. charge
C. energy
D. induced e.m.f.
Answer» D. induced e.m.f.
Discussion
82.

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?
A. increase
B. decrease
C. remain the same
D. initially increase and then decrease
Answer» C. remain the same
Discussion
83.

Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?
A. unaffected
B. doubled
C. halved
D. quadrupled
Answer» C. halved
Discussion
84.

Which of the following circuit element stores energy in the electromagnetic field ?
A. Inductance
B. Condenser
C. Variable resistor
D. Resistance
Answer» B. Condenser
Discussion
85.

The inductance of a coil will increase under all the following conditions except______________?
A. when more length for the same number of turns is provided
B. when the number of turns of the coil increase
C. when more area for each turn is provided
D. when permeability of the core increases
Answer» B. when the number of turns of the coil increase
Discussion
86.

Higher the self-inductance of a coil_____________?
A. lesser its weber-turns
B. lower the e.m.f. induced
C. greater the flux produced by it
D. longer the delay in establishing steady current through it
Answer» E.
Discussion