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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 1.5KW
 3KW
 0.5Kw

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Newtons law.
 Amperes law.
 Coulombs law.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always opened.
  semi closed or semi opened.
  none.
  always closed.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

  Back emf is equal to half of applied voltage.
 Back emf is equal.
 back emf is equal to applied voltage.
 None of above.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
  1 mg of KOH / gm.
 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 temperature difference.
  color of the paint.
 air velocity.
 surface area.

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