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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 5.46 KW.
 0.9103 KW.
 1.644 KW.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 DC Series Motor
 Compound Wound DC Motor
 Separately Excited DC Motor

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

 equal to
 less than
 any of the above
 greater than

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC series motor.
 DC compound motor.
 DC shunt motor with armature resistance.
 DC shunt motor with field weaking control.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
  0.54.
 0.7.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2HZ
 50Hz
 2.5Hz

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