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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 less than 50%.
 same.
 more.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V
 V²
 f²

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  mild steel.
  cast iron.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 37
 74
 72

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 stray losses.
 copper losses.
 dielectric losses.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  980 Watt.
 1920 Watt.
  1960 Watt.

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