Hunting in a synchronous motor cannot be due to variable load variable supply voltage variable frequency windage friction TRUE ANSWER : ? YOUR ANSWER : ?
Mostly, synchronous motors are of Salient pole type machines Alternator type machines Induction type machines Smooth cylindrical type machines TRUE ANSWER : ? YOUR ANSWER : ?
The pull out torque of a synchronous motor will ______ as the field excitation is increased. Increase None of the listed here Decrease Remain unchanged TRUE ANSWER : ? YOUR ANSWER : ?
The maximum speed variation in a 3 phase synchronous motor is Zero 10 percent 2 percent 4 percent TRUE ANSWER : ? YOUR ANSWER : ?
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the back e.m.f. will be more than the supply voltage the stator current will be very small the stator current will be very high the stator current will be zero TRUE ANSWER : ? YOUR ANSWER : ?
A synchronous motor will always stop when Load in motor varies Supply voltage frequency changes Supply voltage fluctuates Excitation winding gets disconnected TRUE ANSWER : ? YOUR ANSWER : ?
An important advantage of a synchronous motor over wound round induction motor is that its power factor may be varied at will None of these its speed is independent of supply frequency its speed may be controlled more easily TRUE ANSWER : ? YOUR ANSWER : ?
The minimum armature current of the synchronous motor corresponds to operation at zero power factor leading unity power factor 0.707 power factor leading 0.707 power factor lagging TRUE ANSWER : ? YOUR ANSWER : ?
The back emf in the stator of a synchronous motor depends on Rotor excitation Rotor speed None of the listed here Flux density TRUE ANSWER : ? YOUR ANSWER : ?
The pull out torque of a synchronous motor is generally ______ times its full-load torque. 5 to 10 1.25 to 3.5 6 to 9 0.5 TRUE ANSWER : ? YOUR ANSWER : ?