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Electrical Machines

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

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 windage and friction loss
 Copper loss
 core loss only
 both 1 and 2

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
 synchronous generator.
 synchronous motor.
  induction generator.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 fixing the brush axis inline with the pole axis.
  compensating winding and commutating poles.
 increasing field excitation.
 shifting the brush axis from GNA to MNA.

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Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
 statically induced emf.
None of these
 dynamically and statically induced emf.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

  340 A.
 570 A.
  460 A.
 250 A.

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