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Electrical Machines

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
Which type of motors uses slip rings?

 DC Shunt Motor
 Induction motors
 Synchronous motors
 Both Synchronous and Induction motor

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Remain unchanged.
 Depends on other factor.
  Increase by 5%.
 Reduce by 5%.

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 cast steel.
  cast iron.
 wrought iron.

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Electrical Machines
Which of the following rotor requires damper winding?

None of these
 Cylindrical rotor.
 Salient pole rotor.
 Both type rotor.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 (Pi/Pc)2
 Pc/Pi
 Pi/Pc
 √(Pi/Pc)

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