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Electrical Machines

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

 linearised
 hyperbola
 parabola
 any of the above

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 cogging.
 crawling.
 plugging.
 locking.

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
 Shunt motor.
  Series motor.
 Brushless DC motor.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 both A and B
 armature circuit
 none of above

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Electrical Machines
Ward Leonard control is provides speed control

  In both direction.
  Above rated speed.
  Below rated speed.
  In one direction only.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 any of the above.
 normal speed.
 synchronous speed.

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MORE MCQ ON Electrical Machines

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