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Electrical Machines

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

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

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 any of above.
 rough commutator surface.
 severe sparking.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thick
 large and thin
 less and thick

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Electrical Machines
Select the motor that should not be started on no load?

 Brushless DC motor.
 Compound motor.
 Shunt motor.
  Series motor.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
None of these
 not changed

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Synchronous motor.
  Double cage motor.
  Squirrel cage IM.

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