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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 constant loss
 variable loss
 both A and B
None of these

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

 half load
 no load
 full load
 any of the above

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Electrical Machines
A DC series motor must started on no load because it would

 Not develop starting torque.
 Draw more current without producing sufficient torque.
  Run at dangerously high speed.
 Fail to start without load.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 cummulative compound motor.
 AC synchronous motor.
  series motor.

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Electrical Machines
DC machine is a

 convection machine.
 none of above are correct.
 conduction machine.
 both are correct.

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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?

 205 V.
  201.02 V.
 212 V.
 210 V.

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