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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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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

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

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  any of the above.
  short-circuited rotor.
  wound rotor.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing of frequency.
  increasing number of poles.
  speed can not be increased.
  decreasing of frequency.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 25.564 Ω.
 2.74 Ω.
 2.781 Ω.
  2.241 Ω.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 half load
 full load
 any of the above

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