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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

  zero.
  less than 1 %.
 4 %.
 1.5 %.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.6 kW, 12 kW.
  6.3 kW, 9.3 kW.
 9.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant torque control
 constant power control
 constant current control

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 460 V
 115 V
 200 V

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
None of these
 both A and B

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

None of these
  reactance voltage.
  dynamically induced voltage.
  statically induced voltage.

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