Polyphase Induction Motor Objective Questions & Answers - 2

Question: 6

In a wound 3-phase induction motor, brushes should be connected to

(A) external star connected resistors

(B) power supply

(C) equalizing coils

(D) external D.C. excitation

Question: 7

In the circle diagram for induction motor, the diameter of the circle represents

(A) line voltage

(B) running torque

(C) rotor current

(D) slip

Question: 8

The reversing of 3 phase A.C. motor is achieved by

(A) an auto transformer

(B) interchanging any two of the supply lines

(C) D.O.L. starter

(D) star delta starter

Question: 9

Speed variations of a squirrel cage induction motor are essentially similar to those of

(A) differential compound motor

(B) synchronous motor

(C) D.C. series motor

(D) D.C. shunt motor

Question: 10

The shaft of an induction motor is made of

(A) cast iron

(B) carbon steel

(C) high speed steel

(D) stainless steel