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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  stator frame.
  pole faces.
  rotor shaft.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Eye bolt.
 Equalizer rings.
 Commutator.
 Dummy coils.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 either of these depending on the design of the motor
 in parallel
 through inductive coupling
 in series

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

  1.
 0.4.
 0.6.
 0.8.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 low current and high voltage
 high current and low voltage
 high current and high voltage
 low current and low voltage

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Ampere law.
 Lenz's law.
 Fleming's right hand rule.
 Fleming's left hand rule.

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