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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Low.
  Equal to 1.
  Same as full load.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 any of the two machines
 machine A
 machine B
 none of these

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Electrical Machines
Lamination of core are generally made of

 silicon steel.
 carbon.
 cast iron.
 stainless steel.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its power factor will reduce
 its speed will reduce
 its speed will increase
 its efficiency will improve

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Open fuse or circuit breaker.
 Draw too much current.
  Develop excessive speed and damage itself.

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

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

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