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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 25 W.
 30 W.
 28 W.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  reduces generator emf.
  reduces inter poles flux density.
  increases armature speed.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 1-S
 1/S
 S

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 reduce the magnetic hum and locking tendency of rotor.
 provide ease of fabrication.
 increase the strength of rotor bars.
 decrease the amount of copper to be used.

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Electrical Machines
A smaller air gap in a induction motor helps to

 increase the starting torque.
 reduce the chance of cogging.
 reduce the magnetizing current.
 reduce the chance of crawling.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -1.92
 1.92
 -0.08

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