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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less maintenance.
  less cost.
  all of below.
  simple in construction.

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

 full load
 no load
 half load
 any of the above

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra maximum and Rf maximum
 Rf maximum and Ra minimum
 Ra maximum and Rf minimum
 Ra minimum and Rf minimum

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  any of these.
  over excitation.
  vibrations.

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Electrical Machines
In DC machine yoke offers

 both A and B
 mechanical protection to the machine
 produce working flux
 flux path completion

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48.5 Hz
 48 Hz
 45 HZ
 50 Hz

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