In a synchronous motor, the armature current has large values for____________?
Correct answer: C. both high and low excitation
- A. high excitation only
- B. low excitation only
- C. both high and low excitation
- D. none of the above
Explanation
For a fixed load, both under-excitation and over-excitation move the motor away from its minimum-current condition, so armature current becomes large at both extremes. The minimum current occurs near the excitation giving unity power factor.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Electrical Machines
1,061 free Electrical Machines MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electrical Machines questions
Which of the following losses, in a synchronous motor, does not vary with load?
The size of a synchronous motor decreases with the increase in___________?
Which of the following losses is not dissipated by the stator core surface in a synchronous motor?
The back e.m.f. in the stator of a synchronous motor depends on____________?
If the field of a synchronous motor is underexcited, the power factor will be_____________?
In a synchronous motor, the damping winding is generally used to______________?