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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 increase
None of these
 decrease

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Electrical Machines
A DC series motor must started on no load because it would

 Draw more current without producing sufficient torque.
 Not develop starting torque.
  Run at dangerously high speed.
 Fail to start without load.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 10 Hz.
 50 Hz.
  2 Hz.
  3 Hz.

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

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

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Series.
  Shunt.
  Compound.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara

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