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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 increase
 decrease
 either increase or decrease

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Shaft torque.
  Core loss component.
 Synchronous speed.
 Rotor speed.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 using transformer oil of better quality.
 using soft material for winding.
 increasing the number of turns.

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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

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

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 59 / 3.
  slip X 50 / 3.
  slip X 69 / 3.
 1.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
 100 V.
  230.2 V.

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