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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 200 - 250 W.
 10 - 20 W.
 250 - 500 W.

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

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

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

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

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  synchronous motor torque.
  DC motor torque.
  induction generator torque.

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase synchronous machine.
  None of these.
  Single phase induction motor.
  Poly-phase induction motor.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.95
 1.06
 0.87
 0.96

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