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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 0 < S < 1
 -2 < S < 2
 0 < S < 2

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at light loads only
 low at rated load only
 low at heavy loads only
 both A and B

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Doubled.
 Remains same.
 Four times.
 Eight times.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 8
 2

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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.
 5.7 kW, 8.7 kW.
 9.3 kW, 9.3 kW.
  6.3 kW, 9.3 kW.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will become lagging
None of these
 will remain the same

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