Electrical Engineering Mcqs Practice Test

Question 1

The range of efficiency for shaded pole motors is______________?

Accepted Answer

D. 5% to 35%

Question 2

Burning out of winding is due to___________?

Accepted Answer

A. short circuited capacitor

Question 3

Direction of rotation of a split phase motor can be reversed by reversing the connection of__________?

Accepted Answer

C. either A. or (b)

Question 4

Which of the following motors is inherently self starting ?

Accepted Answer

B. Shaded-pole motor

Question 5

The direction of rotation of an hysteresis motor is determined by____________?

Accepted Answer

B. position of shaded pole with respect to main pole

Question 6

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will______________?

Accepted Answer

D. not start at all

Question 7

Which of the following motors is used in mixies ?

Accepted Answer

D. Universal motor

Question 8

In a single phase motor the centrifugal switch____________?

Accepted Answer

A. disconnects auxiliary winding of the motor

Question 9

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be___________?

Accepted Answer

D. at the slot edge where coil enters or comes out of the slot

Question 10

The value of starting capacitor of a fractional horse power motor will be__________?

Accepted Answer

C. 300 uF

Question 11

In repulsion motor direction of rotation of motor____________?

Accepted Answer

B. is the same as that of brush shift

Question 12

A centrifugal switch is used to dis- connect ‘starting winding when motor has___________?

Accepted Answer

C. picked up about 50 to 70 per cent of rated speed

Question 13

In a shaded pole single-phase motor, the revolving field is produced by the use of_________?

Accepted Answer

D. shading coils

Question 14

If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?

Accepted Answer

A. Universal motor

Question 15

Which of the following motor will have relatively higher power factor ?

Accepted Answer

A. Capacitor run motor

Question 16

In a shaded pole motor, the shading coil usually consist of___________?

Accepted Answer

B. a single turn of heavy copper wire which is short-circuited and carries only induced current

Question 17

The rotor developed by a single-phase motor at starting is___________?

Accepted Answer

D. zero

Question 18

In a split phase motor____________?

Accepted Answer

A. the starting winding is connected through a centrifugal switch

Question 19

If the capacitor of a single-phase motor is short-circuited_________?

Accepted Answer

A. the motor will not start

Question 20

In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?

Accepted Answer

A. improve power factor