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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 2HZ
 50Hz

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Electrical Machines
In synchronous motor the torque is proportional to

 1/P²
 Power P
 P²
 1/P

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 armature connections.
 armature or field connections.
 shunt field connections.

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Electrical Machines
Ward Leonard control is provides speed control

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

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Electrical Machines
Rotor resistance speed control is used in

 dc shunt motor.
 slip ring induction motor.
 squirrel cage induction motor.
 synchronous motor.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 100 W, 2000 W.
  3190 W, 5040 W.
 1000 W, 5040 W.
 6000 W, 7000 W.

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