The maximum power developed in a synchronous motor occurs at a coupling angle of________?
A60°
B30°
C90°
D180°
Correct answer
C. 90°
Explanation
The correct answer is 90°.
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Study 122 Electrical Engineering MCQs with correct answers and explanations.
Correct answer
C. 90°
Explanation
The correct answer is 90°.
Correct answer
C. the excitation is said to be hundred per cent
Explanation
The correct answer is the excitation is said to be hundred per cent.
Correct answer
A. unity or 0.8 leading
Explanation
The correct answer is unity or 0.8 leading.
Correct answer
A. inversely proportional to the synchronous reactance
Explanation
The correct answer is inversely proportional to the synchronous reactance.
Correct answer
C. flux density
Explanation
The correct answer is flux density.
Correct answer
A. lagging, leading and unity power factors
Explanation
The correct answer is lagging, leading and unity power factors.
Correct answer
D. pole faces
Explanation
The correct answer is pole faces.
Correct answer
C. increase armature current but decrease power factor
Explanation
The correct answer is increase armature current but decrease power factor.
Correct answer
B. only at synchronous speed
Explanation
The correct answer is only at synchronous speed.
Correct answer
B. lagging
Explanation
The correct answer is lagging.