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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 450 rpm.
 540 rpm.
  470 rpm.
  240 rpm.

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Electrical Machines
If the excitation is increased, the power factor is

 unity power factor
 lagging power factor
None of these
 leading power factor

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 decreases.
 remains same.
None of these

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  None of these.
  To convert alternating supply current to direct current.
  To increase the flux cutting by the rotor.
  To absorb the mechanical shocks produced during running condition.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at half load.
  copper loss at any load.
 copper loss at over load.
 copper loss at full load.

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