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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f2.
 f1.5.
 f3.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 45 HZ
 48.5 Hz
 48 Hz
 50 Hz

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Electrical Machines
A shaded pole single phase induction motor can be used for

 wet grinders
 food mixers
 personal computers as cooling fan
 tape recorders

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Electrical Machines
For standing a DC motor a starter is required because

  It starts the motor.
  it limits the speed of the motor.
None of these
  it limits the starting current to a safe value.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 none of above.
 back emf is equal to twice of applied voltage.
 back emf is equal to applied voltage.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 back emf is equal to applied voltage.
 Back emf is equal.
 None of above.
  Back emf is equal to half of applied voltage.

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