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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
  about 75°.
 about 115°.
 0°.

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Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  more breakdown torque.
  higher efficiency.
  leading power factor.

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

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

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
 Magnetic no-load axis.
  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 Ia2
 I/Ia2
 Ia

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
 A modulated supply frequency AC voltage with slip frequency envelop.
  DC of slip frequency.
 AC of supply frequency.

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