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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 10
 1
 100

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  stainless steel.
  aluminium.
  phosphor bronze.

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

 leading
 unity
 zero
 lagging

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Electrical Machines
In DC machines shape of net flux density is?

 sine wave
 saddle shape
 peaky in nature
 flat tapped or trapezoidal

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
 less magnetic core loss.
  no magnetic core loss.
  more copper loss.

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