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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 100Hz.
 150Hz.
 200Hz.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Shunt.
 Differentical compound.
 Cummulative compound.
  Series.

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

  0.54.
  1.
 0.3.
 0.7.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  500 rpm.
  3000 rpm.
  600 rpm.
  3600 rpm.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 140 V
 120 V
 240 V

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

 half load
 full load
 no load
 any of the above

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