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Electrical Machines

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

 any of the above
 half load
 full load
 no load

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3000 rpm.
  600 rpm.
 3600 rpm.
 500 rpm.

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Electrical Machines
DC generator will not build up voltage

 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
 any one of above.
  if it has lost residual magnetism.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 back emf is equal to applied voltage.
 back emf is equal to half of applied voltage.
 none of above.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 20 V.
 60 V.
 0 V.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Shaded pole
 Resistance split phase
 Capacitor run

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