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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V2
 V
 f2
 f

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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.
 240 V.
  256.4 V.

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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?

 210 V.
  201.02 V.
 212 V.
 205 V.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Eg vs Ia
 Eg vs load current
 Vt vs load current

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
  Shunt.
 Compound (cummolative).
 Series.

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Electrical Machines
Universal motors are used in

 cranes
 traction
 food processing
All of these

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