1000+ Synchronous Motor Objective Questions & Answers - 1

Question: 1

The power developed by a synchronous motor will be maximum when the load angle is

(A) zero

(B) 90°

(C) 120°

(D) 180°

Ans: B


Question: 2

The back e.m.f. of a synchronous motor depends on

(A) load angle

(B) speed

(C) load

(D) all of the above

Ans: A

load angle

Question: 3

The rotor copper losses, in a synchronous motor are met by

(A) armature input

(B) motor input

(C) supply lines

(D) d.c. source

Ans: D

d.c. source

Question: 4

To limit the operating temperature an electrical machine should have proper

(A) speed

(B) power factor

(C) current rating

(D) voltage rating

Ans: C

current rating

Question: 5

A synchronous motor can operation at

(A) lagging, leading and unity power factors

(B) unity power factor only

(C) leading power factor only

(D) lagging power factor only

Ans: A

lagging, leading and unity power factors

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