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.Management Sciences
A. the force required to accelerate the rotor to the synchronous speed in an instant is absent
B. the starting device to accelerate the rotor to near synchronous speed is absent
C. a rotating magnetic field does not have enough poles
D. the rotating magnetic field is produced by only 50 Hz frequency currents
Related Mcqs:
- The induced e.m.f. in a synchronous motor working on leading power factor will be_____________?
- A. more than the supply voltage B. less than the supply voltage C. equal to the supply voltage D. None of these...
- In a synchronous motor, the maximum power developed depends on all of the following except:
- A. rotor excitation B. maximum value of coupling angle C. direction of rotation D. supply voltage...
- In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
- A. d.c. excitation only B. speed of the motor C. load on the motor D. both the speed and rotor flux...
- If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
- A. will become more B. will become less C. will remain unchanged D. none of the above....
- A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as_________?
- A. static condenser B. condenser C. synchronous condenser D. none of the above...
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