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Electrical Machines

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

 V
 f
 V²
 f²

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  None of above.
  Ward Leonard control.
  Any of above method.
  Rheostatic control.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  rotor winding.
  stator winding.
  either stator winding or rotor winding.
None of these

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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 shunt motor with armature resistance.
 DC series motor.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 48.5Hz
 1.5Hz
 2.5Hz
 51.5Hz

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 23 A.
  13.5 A.
 27 A.
 11.5 A.

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