Polyphase Induction Motor Objective Questions & Answers - 1

Question: 1

Slip rings are usually made of

(A) aluminium

(B) phosphor bronze

(C) carbon

(D) copper

Ans: B

phosphor bronze

Question: 2

Short circuit test on an induction motor cannot be used to determine

(A) power scale of circle diagram

(B) transformation ratio

(C) copper losses

(D) windage losses

Ans: D

windage losses

Question: 3

In case of a double cage induction motor, the inner cage has

(A) high inductance and high resistance

(B) low inductance and low resistance

(C) low inductance and high resistance

(D) high inductance and low resistance

Ans: D

high inductance and low resistance

Question: 4

An induction motor is identical to

(A) synchronous motor

(B) asynchronous motor

(C) D.C. compound motor

(D) D.C. series motor

Ans: B

asynchronous motor

Question: 5

Which of the following motors has the highest power to weight ratio?

(A) universal motor

(B) induction motor

(C) capacitor motor

(D) synchronous motor

Ans: A

universal motor

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