Electrical Engineering Mcqs Practice Test

Question 1

In a split phase motor, the running winding should have?

Accepted Answer

B. low resistance and high inductance

Question 2

In capacitor start single-phase motors____________?

Accepted Answer

A. current in the starting winding leads the voltage

Question 3

In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?

Accepted Answer

D. 90°

Question 4

Which of the following motor will give relatively high starting torque ___________?

Accepted Answer

A. Capacitor start motor

Question 5

Insertion of resistance in the stator of an induction motor___________?

Accepted Answer

B. decreases the starting torque

Question 6

The starting torque of a three phase induction motor can be increased by__________?

Accepted Answer

C. both A. and (b)

Question 7

The rotor of an induction motor runs at__________?

Accepted Answer

B. below synchronous speed

Question 8

In a star-delta starter of an induction motor___________?

Accepted Answer

D. applied voltage perl stator phase is 57.7% of the line voltage

Question 9

Slip ring motor is preferred over squirrel cage induction motor where___________?

Accepted Answer

A. high starting torque is required

Question 10

Reduced voltage starter can be used with_____________?

Accepted Answer

C. squirrel cage as well as slip ring induction motor

Question 11

A squirrel cage induction motor is not selected when___________?

Accepted Answer

C. higher starting torque is the main consideration

Question 12

Less maintenance troubles are experienced in case of___________?

Accepted Answer

B. squirrel cage induction motor

Question 13

In a squirrel cage motor the induced e.m.f. is___________?

Accepted Answer

C. slip times the stand still e.m.f. induced in the rotor

Question 14

The purpose of using short-circuit gear is___________?

Accepted Answer

A. to short circuit the rotor at slip rings

Question 15

Temperature of the stator winding of a three phase induction motor is obtained by___________?

Accepted Answer

D. all above methods

Question 16

For driving high inertia loads best type of induction motor suggested is_____________?

Accepted Answer

A. slip ring type

Question 17

Insertion of resistance in the rotor of an induction motor to develop a given torque?

Accepted Answer

D. rotor current rernains same

Question 18

Insertion of reactance in the rotor circuit_______?

Accepted Answer

A. reduces starting torque as well as maximum torque

Question 19

An induction motor can run at synchronous speed when____________?

Accepted Answer

D. e.m.f. is injected in the rotor circuit

Question 20

The low power factor of induction motor is due to___________?

Accepted Answer

D. all of the above