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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 30 W.
 25 W.
 36 W.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
 greater than that of turbo alternator.
 equal to that of the effective length of the line.
  none of these.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at lower speed.
 run at normal speed.
 burn.

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  medium.
  low.
  high.
  zero.

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Electrical Machines
Armature reaction in dc motor results

  increase in speed.
  open circuit.
  short circuit.
  decrease in speed.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and short circuit tests.
 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and zero power factor tests.

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