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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
 1.5 %.
  less than 1 %.
  zero.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 any of the above
 equal to
 less than

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 R1 /K²
 K×R1
 R1 /K

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 decrease
 remain nearly constant
 increase gradually and then stay at rated voltage

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
  reactance voltage induced in the coil.
 armature emf.
  coil resistance.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 speed regulation.
 running torque.
 starting torque.
 efficiency.

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