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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 either increase or decrease
None of these
 increase
 decrease

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  depends on the material of stator and the rotor.
  as wide as possible.
  air gap does not matter.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 variable reluctance motor.
 switched reluctance motor.
 induction motor.
 DC motor.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
 100 V.
  230.2 V.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve current level.
  Improve power level.
  Improve power factor.
  Improve voltage level.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

  Capacitor run type.
 Split phase type.
 Shaded pole type.
 Capacitor start.

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