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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Low.
  Same as full load.
  Equal to 1.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 4 V
 0 V
 2 V
 1 V

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.
  Shunt motor.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 40 V.
 30 V.
 90 V.
 60 V.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  make noise.
  run normally.
  not run.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 zero
 lagging
 leading

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