Electrical Engineering Mcqs Practice Test

Question 1

Which of the following statements regarding a reluctance motor is incorrect ?

Accepted Answer

A. It cannot be reversed, ordinarily

Question 2

A shaded pole motor does not possess___________?

Accepted Answer

D. all of the above

Question 3

To reverse the direction of rotation of acapacitor start motor while it is running we should___________?

Accepted Answer

A. disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

Question 4

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?

Accepted Answer

D. run as induction motor

Question 5

Most of the fractional horsepower motors have either___________?

Accepted Answer

D. plain or sleeve bearings

Question 6

In a universal motor, the most common cause of brush sparking is___________?

Accepted Answer

E. all of the above

Question 7

Which of the following statements regarding reluctance-start motor is incorrect ?

Accepted Answer

A. It is similar to reluctance motor

Question 8

If starting winding of a single-phase induction motor is left in the circuit, it will____________?

Accepted Answer

C. draw excessive current and overheat

Question 9

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?

Accepted Answer

D. electrolytic capacitor will, in all probability, suffer break down

Question 10

Which of the following statements regarding two value capacitor motor is incorrect ?

Accepted Answer

B. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

Question 11

If a single phase induction motor runs slower than normal, the most likely defect is_____________?

Accepted Answer

A. worn bearings

Question 12

Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________?

Accepted Answer

C. it has low starting as well as running currents at relatively high power factor

Question 13

Which of the following motors is used in tape-recorders ____________?

Accepted Answer

A. Hysteresis motor

Question 14

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a___________?

Accepted Answer

A. magnetic relay

Question 15

Centrifugal switch disconnects the auxiliary winding of the motor at about ______ percent of synchronous speed?

Accepted Answer

B. 70 to 80

Question 16

Which of the following motors is used in a situation where load increases with speed ?

Accepted Answer

B. Three-phase series motor

Question 17

Which of the following motors is used for unity power factor ?

Accepted Answer

B. Schrage motor

Question 18

In repulsion motor, zero torque is developed when___________?

Accepted Answer

D. both B. and (c)

Question 19

The motor used for the compressors is____________?

Accepted Answer

C. capacitor-start capacitor-run motor

Question 20

The purpose of stator winding in the compensated repulsion motor is to_____________?

Accepted Answer

B. improve power factor and provide better speed regulation