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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 1470 rpm
 1500 rpm
 30 rpm

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 212 V.
  201.02 V.
 205 V.
 210 V.

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Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 high frequency supply
 rated transformer voltage
 rated transformer current

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Electrical Machines
Transformer oil is used as

 an insulator.
 both A and B.
 a coolant.
 inert medium.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 rating of generators should be same.
 both A and B.
 terminal voltage should be same.

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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.
 240 V.
 271.7 V.

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