Induction Machines Quiz Questions & Answers Pdf - 2

Question: 6

A smaller air gap in a poly phase induction motor helps to

(A) Reduce the chance of cogging

(B) Reduce the magnetizing current

(C) Reduce the chance of crawling

(D) Increase the starting torque

Question: 7

The mmf produced by the rotor currents of a 3-phase induction motor

(A) Is at standstill with respect to stator mmf

(B) Rotates at slip speed with respect to stator mmf

(C) Rotates at synchronous speed with respect to rotor

(D) Rotates at the speed of rotor in the air gap

Question: 8

A wound rotor induction motor can be distinguished from squirrel cage induction motor by

(A) Shaft diameter

(B) Size of frame

(C) Presence of slip rings

(D) Any of the above

Question: 9

In a 3-phase induction motor, the variable mechanical load is represented electrically by a variable _____ only.

(A) Resistance

(B) Capacitance

(C) Inductance

(D) Any of these

Question: 10

The frame of an induction motor is made of

(A) Aluminium

(B) Closed grained cast iron

(C) Silicon steel

(D) Stainless steel