1000+ Industrial Drives Objective Questions and Answers Pdf - 2

Question: 6

Which of the following motors is preferred for traction work?

(A) Three phase induction motor

(B) Synchronous motor

(C) Universal motor

(D) D.C. series motor

Question: 7

When the load is above _____ a synchronous motor is found to be more economical.

(A) 2 kW

(B) 5 kW

(C) 100 kW

(D) 1000 kW

Question: 8

For which of the following applications D.C. motors are still preferred?

(A) high starting torque

(B) variable speed drive

(C) reversibility

(D) high efficiency operation

Question: 9

In jaw crushes a motor has to often start against _____ load.

(A) low

(B) medium

(C) normal

(D) heavy

Question: 10

In squirrel cage induction motors which of the following methods of starting cannot be used?

(A) star-delta starting

(B) auto-transformer starting

(C) resistance in stator circuit

(D) resistance in rotor circuit