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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 any of the above
 hyperbola
 linearised
 parabola

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Series Motor
 Separately Excited DC Motor
 DC Shunt Motor
 Compound Wound DC Motor

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Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
 8 pole.
  2 pole.
 4 pole.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
The armature of a DC motor is laminated to reduce

 friction and windage loss.
 copper loss.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 both 1 and 2
 unity slip
 high slip region
 low slip region

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