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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  2.
 4.
  8.
 6.

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Electrical Machines
Poles of DC machine are often laminated to

 reduce iron weight.
 dissipate more heat.
 reduce armature reaction.
 reduce pulsation loss.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
 50 Hz.
 10 Hz.
  3 Hz.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 not suitable for rapidly changing loads.
 constant speed.
 none of above.
 less expensive.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 36°
 30°
 18°

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on designed speed.
  the generator runs on full load.
  the generator runs on overload.

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