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
90°
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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