1000+ Synchronous Motors MCQ Questions and Answers - 1
Question: 1
A synchronous motor running with normal excitation adjust to load increases essentially by increase in
(A) back e.m.f
(B) torque angle
(C) power factor
(D) armature current
Ans: D
armature current
Question: 2
Power factor of a synchronous motor is unity when
(A) the armature current is maximum
(B) the armature current is zero
(C) the armature current is maximum
(D) none of the above
Ans: C
the armature current is maximum
Question: 3
The construction of a synchronous motor resembles
(A) an alternator
(B) a rotary converter
(C) an induction motor
(D) a series motor
Ans: A
an alternator
Question: 4
The angle between the rotor poles and stator poles in a synchronous motor is known as
(A) angle of retardation
(B) synchronizing angle
(C) torque angle
(D) power factor angle
Ans: C
torque angle
Question: 5
In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
(A) one third
(B) twice
(C) thrice
(D) six times
Ans: C
thrice
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