1000+ Poly Phase Induction Motor MCQ Questions & Answers - 1

Question: 1

In squirrel cage induction motors, the rotor slots are usually given slight skew in order to

(A) reduce magnetic hum

(B) reduce accumulation of dirt and dust

(C) reduce eddy currents

(D) reduce windage losses

Question: 2

Star delta starting of motors is not possible in case of

(A) high speed motors

(B) low horse power motors

(C) variable speed motors

(D) single phase motors

Question: 3

If any two phases for an induction motor are interchanged

(A) the motor will burn

(B) the motor will not run

(C) the motor will run at reduced speed

(D) the motor will run in reverse direction

Question: 4

A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor

(A) will continue running without any harm to the winding

(B) will stop and carry heavy current causing permanent damage to its winding

(C) will continue running burning its two phase

(D) will continue running burning its one phase

Question: 5

The circle diagram for an induction motor cannot be used to determine

(A) output

(B) frequency

(C) power factor

(D) efficiency