Synchronous motors are generally not self-starting because:
Correct answer: B. the direction of instantaneous torque reverses after half cycle
- A. the direction of rotation is not fixed
- B. the direction of instantaneous torque reverses after half cycle
- C. startes cannot be used on these machines
- D. starting winding is not provided on the machines
Explanation
At standstill, the synchronous rotor cannot follow the rapidly reversing stator field. The instantaneous torque reverses every half cycle, so its average starting torque is zero.
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
In case one phase of a three-phase synchronous motor is short-circuited the motor will____________?
A three-phase synchronous motor will have_____________?
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
The capacitors used in single-phase capacitor motors have no__________?
If a D.C. series motor is operated on A.C. supply, it will____________?
In a A.C. series motor armature coils are usually connected to commutator____________?