Computer Programming MCQs

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

A. Not start
B. Run at 2/3 of synchronous speed
C. Run with excessive vibrations
D. Take less than the rated load

A. No slip-rings
B. One slip-ring
C. Two slip-rings
D. Three slip-rings

A. V
B. V312
C. V2
D. 1/v

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

A. Leading current
B. Lagging current
C. Both a. and (b)
D. None of the above

A. Armature current and power factor
B. Terminal voltage and load factor
C. Power factor and field current
D. Field current and armature current

A. Windage loss
B. Bearing friction loss
C. Copper loss
D. Core loss

A. 1%
B. 0.5%
C. Positive
D. Zero

A. Supply voltage fluctuates
B. Load in motor varies
C. Excitation winding gets disconnected
D. Supply voltage frequency changes