Computer Programming MCQs

A. 45°
B. 60°
C. 90°
D. 120°

A. No change of power factor
B. Lagging power factor with over-excitation
C. Leading power factor with under-excitation
D. Leading power factor with over-excitation

A. Windage friction
B. Variable load
C. Variable frequency
D. Variable supply voltage

A. Load on the motor
B. D.c. excitation only
C. Both the speed and rotor flux
D. None of the above

A. Decrease both armature current and power factor
B. Decrease armature current but increase power factor
C. Increase armature current but decrease power factor
D. Increase both its armature current and power factor

A. Rotor excitation
B. Maximum value of coupling angle
C. Direction of rotation
D. Supply voltage

A. 10 per cent
B. 6 per cent
C. 4 per cent
D. 2. per cent

A. Will refuse to start
B. Will overheat in spots
C. Will not come upto speed
D. Will fail to pull into step

A. Stator supply is relieved of responsibility of producing magnetic field
B. Mechanical load on the motor can be adjusted
C. Synchronous motor runs at synchronous speed
D. Synchronous motor has large air gap

A. Of reducing number of slip rings on the rotor
B. Armature is associated with large power as compared to the field circuits
C. Of difficulty of providing high voltage insulation on rotor
D. All of the above reasons