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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 480 V.
 350 V.
 420 V.

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

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

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 unity.
  lagging.
 leading.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
 Cylindrical rotor.
 Both type rotor.
None of these

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
 225 V.
  222 V.
 230 V.

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Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  maximum torque.
  none.
  electromagnetic torque.

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MORE MCQ ON Electrical Machines

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