Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 110 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.

Short-circuiter is used in_____________?
A. repulsion induction motor
B. repulsion motor
C. repulsion start induction run motor
D. none of the above
Answer» D. none of the above
Discussion
52.

A.C. series motor as compared to D.C. series motor has__________?
A. smaller brush width
B. less number of field turns
C. more number of armature turns
D. less air gap
E. all of the above
Answer» F.
Discussion
53.

In a capacitor start single-phase motor, when capacitor is replaced by a resistance____________?
A. torque will increase
B. the motor will consume less power
C. motor will run in reverse direction
D. motor will continue to run in same direction
Answer» E.
Discussion
54.

Speed control of a universal motor is achieved by__________?
A. varying field flux with tapped field windings
B. connecting rheostat in series
C. applying variable voltage by means of silicon controlled rectifier
D. applying variable voltage by means of variable auto-transformer
E. all of the above methods
Answer» F.
Discussion
55.

Which of the following statements regarding single-phase induction motors correct?
A. It requires only one winding
B. It can rotate in one direction only
C. It is self-starting
D. It is not self-starting
Answer» E.
Discussion
56.

The starting winding of a single-phase motor is placed in_________?
A. armature
B. field
C. rotor
D. stator
Answer» E.
Discussion
57.

Which of the following statements regarding hysteresis motor is in incorrect?
A. It is extremely sensitive to fluctuations in supply voltage
B. Its high starting torque is due to its high rotor hysteresis loss
C. It is extremely quiet in operation
D. It accelerates from rest to full-speed almost instantaneously
Answer» B. Its high starting torque is due to its high rotor hysteresis loss
Discussion
58.

Which of the following motor will give the highest starting torque ?
A. D.C. shunt motor
B. Schrage motor
C. Repulsion start and induction run motor
D. Universal motor
Answer» C. Repulsion start and induction run motor
Discussion
59.

A hysteresis motor works on the principle of__________?
A. hysteresis loss
B. magnetisation of rotor
C. eddy current loss
D. electromagnetic induction
Answer» B. magnetisation of rotor
Discussion
60.

The power factor of a single-phase induction motor is usually?
A. lagging
B. always leading
C. unity
D. unity to 0.8 leading
Answer» B. always leading
Discussion
61.

A shaded pole motor can be used for_____________?
A. toys
B. hair dryers
C. circulators
D. any of the above
Answer» E.
Discussion
62.

In split-phase motor auxiliary winding is of___________?
A. thick wire placed at the bottom of the slots
B. thick wire placed at the top of the slots
C. thin wire placed at the top of the slots
D. thin wire placed at the bottom of the slots
Answer» D. thin wire placed at the bottom of the slots
Discussion
63.

The range of efficiency for shaded pole motors is______________?
A. 95% to 99%
B. 80% to 90%
C. 50% to 75%
D. 5% to 35%
Answer» E.
Discussion
64.

Which of the following motors will operate at high power factor ?
A. Shaped pole motor
B. Split phase motor
C. Capacitor start motor
D. Capacitor run motor
Answer» E.
Discussion
65.

Single phase induction motor usually operates on__________?
A. 0.6 power factor lagging
B. 0.8 power factor lagging
C. 0.8 power factor leading
D. unity power factor
Answer» B. 0.8 power factor lagging
Discussion
66.

Which of the following single-phase motors is suitable for timing and control purposes ?
A. Reluctance motor
B. Series motor
C. Repulsion motor
D. Universal motor
Answer» B. Series motor
Discussion
67.

A schrage motor can run on___________?
A. zero slip
B. negative slip
C. positive slip
D. all of the above
Answer» E.
Discussion
68.

A universal motor can run on___________?
A. A.C. only
B. D.C. only
C. either A.C. or D.C.
D. none of the above
Answer» D. none of the above
Discussion
69.

Which of the following motors is preferred for tape-recorders ?
A. Shaded pole motor
B. Hysteresis motor
C. Two value capacitor motor
D. Universal motor
Answer» C. Two value capacitor motor
Discussion
70.

Which of the following applications always have some load whenever switched on ?
A. Vacuum cleaners
B. Fan motors
C. Pistol drills
D. All of the above
Answer» D. All of the above
Discussion
71.

In split phase motor main winding is of _____________?
A. thin wire placed at the top of the slots
B. thin wire placed at the bottom of the slots
C. thick wire placed at the bottom of the slots
D. thick wire placed at the top of the” slots
Answer» D. thick wire placed at the top of the” slots
Discussion
72.

The rotor of a hysteresis motor is made of___________?
A. aluminium
B. cast iron
C. chrome steel
D. copper
Answer» D. copper
Discussion
73.

The motor used on small lathes is usually_________?
A. universal motor
B. D.C. shunt motor
C. single-phase capacitor run motor
D. 3-phase synchronous motor
Answer» D. 3-phase synchronous motor
Discussion
74.

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?
A. damage to the starting winding
B. damage to the centrifugal switch
C. overloading of running winding
D. none of the above
Answer» B. damage to the centrifugal switch
Discussion
75.

Speed torque characteristic of a repulsion induction motor is similar to that of a D.C____________?
A. shunt motor
B. series motor
C. compound motor
D. separately excited motor
Answer» D. separately excited motor
Discussion
76.

The speed control of universal motor used for sewing machines is by____________?
A. friction
B. varying the resistance
C. tapping the field
D. centrifugal mechanism
Answer» C. tapping the field
Discussion
77.

In repulsion motor, maximum torque is developed when____________?
A. brush axis is at 45° electrical to the field axis
B. brush axis coincides with the field axis
C. brush axis is at 90° electrical to the field axis
D. none of the above
Answer» B. brush axis coincides with the field axis
Discussion
78.

In a two value capacitor motor, the capacitor used for running purposes is_______________?
A. air capacitor
B. paper spaced oil filled type
C. ceramic type
D. a.c. electrolytic type
Answer» C. ceramic type
Discussion
79.

Torque developed by a single phase induction motor at starting is_____________?
A. pulsating
B. uniform
C. none of the above
D. nil
Answer» E.
Discussion
80.

The wattage of motor for driving domestic sewing machine will be around__________?
A. 100 to 150 W
B. 40 to 75 W
C. 10 to 30 W
D. 5 to 10 W
Answer» B. 40 to 75 W
Discussion
81.

The wattage rating for a ceiling fan motor will be in the range_________?
A. 200 to 250 W
B. 250 to 500 W
C. 50 to 150 W
D. 10 to 20 W
Answer» D. 10 to 20 W
Discussion
82.

In case of high speed universal motor which of the following needs more attention?
A. End play
B. Air gap
C. Insulation in rotor
D. Balancing of rotor
Answer» E.
Discussion
83.

The repulsion-start induction-run motor is used because of___________?
A. good power factor
B. high efficiency
C. minimum cost
D. high starting torque
Answer» E.
Discussion
84.

A reluctance motor____________?
A. is self-starting
B. is constant speed motor
C. needs no D.C. excitation
D. all of the above
Answer» E.
Discussion
85.

In case of a shaded pole motor the direction of rotation of the motor is__________?
A. from main pole to shaded pole
B. from shaded pole to main pole
C. either of the above depending on voltage
D. either of the above depending on power factor
Answer» B. from shaded pole to main pole
Discussion
86.

Which of the following single-phase induction motors is generally used in time phonographs ?
A. Resistance start
B. Capacitor start capacitor run
C. Shaded pole
D. Universal
Answer» D. Universal
Discussion
87.

Which of the following motors can be run on AC. as well as D.C. supply ?
A. Universal motor
B. Repulsion motor
C. Synchronous motor
D. Reluctance motor
Answer» B. Repulsion motor
Discussion
88.

Which motor is normally free from mechanical and magnetic vibrations ?
A. Split phase motor
B. Universal motor
C. Hysteresis motor
D. Shaded pole motor
Answer» D. Shaded pole motor
Discussion
89.

Which of the following motors has highest starting torque ?
A. Repulsion motor
B. Shaped pole motor
C. Capacitor-start motor
D. Split-phase motor
Answer» D. Split-phase motor
Discussion
90.

In A.C. series motor compensating winding is employed to_____________?
A. reduce the effects of armature reaction
B. increase the torque
C. reduce sparking at the brushes
D. none of the above
Answer» D. none of the above
Discussion
91.

The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?
A. armature winding
B. field winding
C. either armature winding or field winding
D. none of the above
Answer» D. none of the above
Discussion
92.

In which single-phase motor, the rotor has no teeth or winding ?
A. Split phase motor
B. Reluctance motor
C. Hysteresis motor
D. Universal motor
Answer» D. Universal motor
Discussion
93.

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?
A. high inductance of field and armature circuits
B. induced current in rotor due to variations of flux
C. fine copper wire winding
D. none of the above
Answer» B. induced current in rotor due to variations of flux
Discussion
94.

In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?
A. improve power factor
B. increase overload capacity
C. reduce fluctuations in torque
D. to improve torque
Answer» B. increase overload capacity
Discussion
95.

In capacitor start single-phase motors____________?
A. current in the starting winding leads the voltage
B. current in the starting winding lags the voltage
C. current in the starting winding is in phase with voltage in running winding
D. none of the above
Answer» B. current in the starting winding lags the voltage
Discussion
96.

Which of the following motors can be used for unity power factor ?
A. Capacitor run motor
B. Shaded pole motor
C. Hysteresis motor
D. Schrage motor
Answer» E.
Discussion
97.

n a split phase motor, the running winding should have?
A. high resistance and low inductance
B. low resistance and high inductance
C. high resistance as well as high inductance
D. low resistance as well as low inductiance
Answer» C. high resistance as well as high inductance
Discussion
98.

Which type of load is offered by cranes and hoists ?
A. Gradually varying load
B. Non-reversing, no-load start
C. Reversing, light start
D. Reversing, heavy start
Answer» E.
Discussion
99.

The speed of a universal motor is generally reduced by using_________?
A. gear trains
B. V-belts
C. brakes
D. chains
Answer» B. V-belts
Discussion
100.

If the capacitor of a single-phase motor is short-circuited_________?
A. the motor will not start
B. the motor will run
C. the motor will run in reverse direction
D. the motor will run in the same direction at reduced r.p.m
Answer» B. the motor will run
Discussion