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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 1/S
 S
 1/(1-S)

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 back emf is equal to twice of applied voltage.
 none of above.
 back emf is equal to applied voltage.

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Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  V.
  1 / V.
  V2.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 25 ppm.
 45 ppm.
 20 ppm.

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Electrical Machines
The frame of an induction motor is made of

  aluminium.
  silicon steel.
  stainless steel.
  closed grained cast iron.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

  Kef2Kf2Bm2.
 Kef2KfBm2.
 Kef2Kf2Bm.
 KefKf2Bm2.

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