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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f²
 f³
 f
 f1.6

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

 series generator.
  short - shunt generator.
  level compound.
  shunt generator.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC compound motor.
 DC series motor.
 DC shunt motor with armature resistance.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Reluctance motor.
  Synchronous motors.
  Universal motor.
  Slip ring induction motor.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 240 V
 6 V
 234 V
 474 V

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 in order to reduce eddy current to provide large flux.
 to provide large flux.
 as it carries large load current.
 to reduce the insulation of materials.

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