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Electrical Machines

Electrical Machines
Induction motors have the advantage of

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

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 0.2 ohm
 10 ohm
 100 ohm

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Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 eddy current loss
 copper loss
 total iron losses

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Frequency should be same
 Both 1and 2
 Terminal voltage is same

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Electrical Machines
Generator works on the principle of production

 static induced emf.
 both A and B.
None of these
 dynamically induced emf.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
None of these
 MNA
 either GNA or MNA

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