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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 1470 rpm
 30 rpm
 zero

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  transformer.
  asynchronous motor.
  repulsion motor.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 vary the armature resistance.
 limit the armature current.
 none of above.
 control field current.

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  cost of operation.
  breaking torque.
  starting torque.

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Electrical Machines
Ward Leonard control provides speed control

 above rated speed.
 in one direction only.
 in both direction.
 below rated speed.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque decreases
 more and maximum torque remains constant
 more and maximum torque decreases
 less and maximum torque increases

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