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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 f
 V²
 V

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Electrical Machines
A DC series motor must started on no load because it would

  Run at dangerously high speed.
 Draw more current without producing sufficient torque.
 Fail to start without load.
 Not develop starting torque.

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

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

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
  45°C.
 27°C.
 32°C.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  cage.
  none of these.
  wound.

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Electrical Machines
Maximum power developed depends on

 voltage
 load angle
 reactance
 both 1and 2

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