Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 71 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.

1.

Which of the following alternatives will be cheaper ?
A. A 100 H.P. AC. three phase motor
B. Four motors of 25 H.P. each
C. Five motors of 20 H.P. each
D. Ten motors of 10 H.P. each
Answer» B. Four motors of 25 H.P. each
Discussion
2.

Which of the following motors is usually preferred for kiln drives ?
A. Cascade controlled A.C. motor
B. Slip ring induction motor
C. Three phase shunt wound com-mutator motor
D. Any of the above
Answer» E.
Discussion
3.

In ______________ the speed can be varied by changing the position of brushes?
A. slip ring motor
B. schrage motor
C. induction motor
D. repulsion motor
Answer» C. induction motor
Discussion
4.

In squirrel cage induction motors which of the following methods of starting cannot be used ?
A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting
Answer» B. Resistance in stator circuit
Discussion
5.

Belted slip ring induction motor is almost invariably used for_________________?
A. water pumps
B. jaw crushers
C. centrifugal blowers
D. none of the above
Answer» C. centrifugal blowers
Discussion
6.

The travelling speed of cranes varies from_________________?
A. 20 to 30 m/s
B. 10 to 15 m/s
C. 5 to 10 m/s
D. 1 to 2.5 m/s
Answer» E.
Discussion
7.

The cost of an induction motor will increase as________________?
A. horsepower rating increases but r.p.m. decreases
B. horsepower rating decreases but r.p.m. increases
C. horsepower rating and operating speed increases
D. horsepower rating and operating speed decreases
Answer» B. horsepower rating decreases but r.p.m. increases
Discussion
8.

While selecting motor for an air conditioner which of the following characteristics is of great importance ?
A. Type of bearings
B. Type of enclosure
C. Noise
D. Arrangement for power transmis¬sion
E. None of the above
Answer» D. Arrangement for power transmis¬sion
Discussion
9.

Which of the following motors has series characteristics ?
A. Shaded pole motor
B. Repulsion motor
C. Capacitor start motor
D. None of the above
Answer» C. Capacitor start motor
Discussion
10.

In which of the following applications the load on motor changes in cyclic order ?
A. Electric shovels
B. Cranes
C. Rolling mills
D. All of the above
Answer» E.
Discussion
11.

Which of the following machines has heavy fluctuation of load ?
A. Printing machine
B. Punching machine
C. Planer
D. Lathe
Answer» C. Planer
Discussion
12.

In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?
A. d.c. shunt motor
B. schrage motor
C. synchronous motor
D. slip ring induction motor
Answer» E.
Discussion
13.

For derries and winches which of the following drives can be used ?
A. Pole changing squirrel cage motors
B. D.C. motors with Ward-leonard control
C. A.C. slip ring motors with variable resistance
D. Any of the above
Answer» E.
Discussion
14.

___________________has least range of speed control?
A. Slip ring induction motor
B. Synchronous motor
C. D.C. shunt motor
D. Schrage motor
Answer» C. D.C. shunt motor
Discussion
15.

Flame proof motors are used in_________________?
A. paper mills
B. steel mills
C. moist atmospheres
D. explosive atmospheres
Answer» E.
Discussion
16.

Rotor of a motor is usually supported on ___________________ bearings?
A. ball or roller
B. needle
C. bush
D. thrust
Answer» B. needle
Discussion
17.

Heat control switches are used in__________________?
A. transformers
B. cooling ranges
C. three phase induction motors
D. single phase
Answer» C. three phase induction motors
Discussion
18.

In jaw crushers a motor has to often start against ____________________ load?
A. heavy
B. medium
C. normal
D. low
Answer» B. medium
Discussion
19.

__________________ has relatively wider range of speed control?
A. Synchronous motor
B. Ship ring induction motor
C. Squirrel cage induction motor
D. D.C. shunt motor
Answer» E.
Discussion
20.

Battery operated scooter for braking uses________________?
A. plugging
B. mechanical braking
C. regenerative braking
D. rheostatic braking
Answer» C. regenerative braking
Discussion
21.

The size of an excavator is usually expressed in terms of_________________?
A. ‘crowd’ motion
B. angle of swing
C. cubic metres
D. travel in metres
Answer» D. travel in metres
Discussion
22.

_________________method of starting a three phase induction motor needs six terminals ?
A. Star-delta
B. Resistance starting
C. Auto-transformer
D. None of the above
Answer» B. Resistance starting
Discussion
23.

Which of the following is essentially needed while selecting a motor ?
A. Pulley
B. Starter
C. Foundation pedal
D. Bearings
Answer» C. Foundation pedal
Discussion
24.

For blowers which of the following motor is preferred ?
A. D.C. series motor
B. D.C. shunt motor
C. Squirrel cage induction motor
D. Wound rotor induction motor
Answer» C. Squirrel cage induction motor
Discussion
25.

In a paper mill where constant speed is required________________?
A. synchronous motors are preferred
B. A.C. motors are preferred
C. individual drive is preferred
D. group drive is preferred
Answer» D. group drive is preferred
Discussion
26.

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
A. slop speed operation
B. high starting torque
C. low windage losses
D. all of the above
Answer» C. low windage losses
Discussion
27.

Reluctance motor is a________________?
A. variable torque motor
B. low torque variable speed motor
C. self starting type synchronous motor
D. low noise, slow speed motor
Answer» D. low noise, slow speed motor
Discussion
28.

Heavy duty cranes are used in________________?
A. ore handling plants
B. steel plants
C. heavy engineering workshops
D. all of the above
Answer» E.
Discussion
29.

By the use of which of the following m D.C. can be obtained from AC. ?
A. Silicon diodes
B. Mercury arc rectifier
C. Motor generator set
D. Any of the above
Answer» E.
Discussion
30.

In ________________ method of staging three phase induction motors the starting voltage is not reduced?
A. auto-transformer
B. star-delta
C. slip ring
D. any of the above
Answer» D. any of the above
Discussion
31.

For a motor-generator set which of the following motors will be preferred ?
A. Synchronous motor
B. Slip ring induction motor
C. Pole changing induction motor
D. Squirrel cage induction motor
Answer» B. Slip ring induction motor
Discussion
32.

Which of the following motors is preferred for boom hoist of a travelling crane ?
A. Single phase motor
B. Synchronous motor
C. A.C. slip ring motor
D. Ward-Leonard controlled D.C. shunt motor
Answer» D. Ward-Leonard controlled D.C. shunt motor
Discussion
33.

In which of the following applications variable speed operation is preferred ?
A. Exhaust fan
B. Ceiling fan
C. Refrigerator
D. Water pump
Answer» C. Refrigerator
Discussion
34.

_______________has the least value of starting torque to full load torque ratio?
A. D.C. shunt motor
B. D.C. series motor
C. Squirrel cage induction motor
D. Slip ring induction motor
Answer» D. Slip ring induction motor
Discussion
35.

Battery operated scooter for braking uses__________________?
A. plugging
B. mechanical braking
C. regenerative braking
D. rheostatic braking
Answer» C. regenerative braking
Discussion
36.

For which of the following applications motor has to start with high acceleration ?
A. Oil expeller
B. Floor mill
C. Lifts and hoists
D. Centrifugal pump
Answer» D. Centrifugal pump
Discussion
37.

Which of the following happens when star-delta starter is used ?
A. Starting voltage is reduced
B. Starting current is reduced
C. Both A. and B.
D. None of the above
Answer» D. None of the above
Discussion
38.

Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?
A. D.C. motor
B. Squirrel cage induction motor
C. Wound rotor induction motor
D. Synchronous motor
Answer» B. Squirrel cage induction motor
Discussion
39.

A pony motor is used for the starting which of the following motors ?
A. Squirel cage induction motor
B. Schrage motor
C. Synchronous motor
D. None of the above
Answer» D. None of the above
Discussion
40.

The capacity of a crane is expressed in terms of_______________?
A. type of drive
B. span
C. tonnes
D. any of the above
Answer» D. any of the above
Discussion
41.

Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
C. Synchronous motor
D. D.C. motor
Answer» E.
Discussion
42.

Besides a constant speed a synchronous rotor possesses which of the following advantages ?
A. Lower cost
B. Better efficiency
C. High power factor
D. All of the above
Answer» D. All of the above
Discussion
43.

___________________is preferred for synthetic fibre mills?
A. Synchronous motor
B. Reluctance motor
C. Series motor
D. Shunt motor
Answer» C. Series motor
Discussion
44.

The characteristics of drive for crane hoisting and lowering are which of the following ?
A. Precise control
B. Smooth movement
C. Fast speed control
D. All of the above
Answer» E.
Discussion
45.

For crane travel which of the following motors is normally used ?
A. Synchronous motor
B. D.C. differentially compound motor
C. Ward-Leonard controlled D.C. shunt motor
D. AC. slip ring motor
Answer» E.
Discussion
46.

A reluctance motor_________________?
A. is provided with slip rings
B. requires starting gear
C. has high cost
D. is compact
Answer» E.
Discussion
47.

For a D.C. shunt motor which of the following is incorrect ?
A. Unsuitable for heavy duty starting
B. Torque varies as armature current
C. Torque-armature current is a straight line
D. Torque is zero for zero armature current
Answer» B. Torque varies as armature current
Discussion
48.

Which of the following types of motor enclosure is safest ?
A. Totally enclosed
B. Totally enclosed fan cooled
C. Open type
D. Semi closed
Answer» C. Open type
Discussion
49.

The diameter of the rotor shaft for an electric motor depends on which of the following ?
A. r.p.m. only
B. Horse power only
C. Horse power and r.p.m.
D. Horse power, r.p.m. and power factor
Answer» D. Horse power, r.p.m. and power factor
Discussion
50.

In series motor which of the following methods can be used for changing the flux per pole ?
A. Tapped field control
B. Diverter field control
C. Series-parallel control
D. Any of the above
Answer» E.
Discussion