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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 60 Hz
 25 Hz
 50 Hz

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

  100.
 750.
 500.
 200.

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Electrical Machines
Wave winding is employed in DC machine of

  low current and high voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.
 high current and low voltage rating.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 efficiency
 leakage reactance
 per unit impedance
 ratings

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  sipper.
  rotor can not have any laminations.
  thinner.

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Electrical Machines
Dummy coils are used for

All of these
 mechanical balancing.
 increasing efficiency.
 reducing armature reaction.

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