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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lag
 0.2 lead
 unity
 0.9 lag

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole winding
 interpole and compensating windings together
 armature winding
 field winding

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
  slip X 69 / 3.
  slip X 59 / 3.
 1.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  minimum.
  variable.
  constant.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  flat topped.
  pulsating.
 triangular.
  sinusoidal.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  reducing the load voltage.
  increasing the input to the prime mover.
  increasing the excitation.

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