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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EbIa.
  none of these.
  EIa.

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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

 11.5 A.
 27 A.
 23 A.
  13.5 A.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 5 Hz
 50 Hz
 1 Hz

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  induction motor torque.
  synchronous motor torque.
  induction generator torque.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Small and constant load.
  Over-excitation.
  Over-loading for long period.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  5000 - 45000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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