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Electrical Machines

Electrical Machines
Induction motors have the advantage of

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

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Small and constant load.
  Periodic variation of load.
  Over-loading for long period.
  Over-excitation.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  4.
 6.
  data provided is insufficient.
  2.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs load current
 Eg vs Ia
 Eg vs load current
 Vt vs Ia

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Electrical Machines
Scott connections are used for

 any of the above.
 single phase to three phase transformation.
 three phase to single phase transformation.
 three phase to two phase transformation.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 power.
 current.
 torque.

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