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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
  pulsed wave.
 triangular wave.
 sine wave.

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Electrical Machines
At slip s = 1 torque developed in machine is

  electromagnetic torque.
  none.
  maximum torque.
  starting torque.

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Electrical Machines
Ward Leonard control provides speed control

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

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 8 KW.
 10 KW.
 0.
  2 KW.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 5
 10
 12

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Series motor.
 Shunt motor.
 Cummulative compound motor.

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MORE MCQ ON Electrical Machines

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