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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

 28 W.
 36 W.
 30 W.
 25 W.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 kept constant to certain value.
 decreased.
  increased.
 remains same.

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Electrical Machines
Series booster is a

  series wound DC generator.
 permanent magnet DC generator.
 separately excited DC generator.
 shunt wound DC generator.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  hysteresis losses.
  ohmic losses.
  mechanical losses.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

  460 A.
 250 A.
 570 A.
  340 A.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V²
 T ∝ V
 T ∝ 1/V

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