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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
 Xd < Xq.
None of these
 Xd = Xq.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 starting torque.
 efficiency.
 speed regulation.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 both 1 and 2
None of these
 rotor reactance X

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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

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

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  oscillation cannot be damped.
  running the motor on leading power factors.
  providing damper bars in the rotor pole faces.
  maintaining constant excitation.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 2000W
 1920W
 1820W
 1450W

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