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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
  10 HP.
 15 HP.
  13 HP.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
 238.2 V.
  256.4 V.
 240 V.

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  high staring torque and high power factor.
  none.
  high staring torque only.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  25 Hz.
  60 Hz.
  16.67 Hz.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 V²
 1/V
 1/V²

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
  proportional to rotor speed.
 zero.
 constant independent of speed.

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