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Electrical Machines

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

 no load
 any of the above
 half load
 full load

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 commutator.
 slip rings.
 solid connection.
 none of above.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field control.
 Armature resistance control.
 Armature voltage control.
 Field diverter control.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.28 Nm
 15.6 Nm
 16.55 Nm
 Zero

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Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
 squirrel cage induction motor
None of these
 either of these

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  cast iron.
  mild steel.

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