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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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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.
 205 V.
 212 V.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 starting torque.
 efficiency.
 running torque.
 speed regulation.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 3.2% and -1.6%
None of these
 4.8% and -3.2%
 6% and -4%

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Electrical Machines
In synchronous motor the torque is proportional to

 P²
 1/P²
 1/P
 Power P

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 None of the options.
 Permanent magnets.
 Both B and C.

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