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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 Induction motor.
 Both A and C.
 DC motor.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 11.4 A, secondary = 301 A
 primary = 602 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 301 A, secondary = 22.7 A

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  residual flux.
  high field resistance.
  high speed.
  magnetic inertia.

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

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

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

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

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Electrical Machines
Copper brushes in DC machine are used

 where high voltage and low current.
None of these
 where low voltage and high currents are involved.
 in both of above cases.

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