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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  P.
  none of these.
  Z.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 increase starting torque.
 reduce chance of cogging.
  reduce magnetizing current.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Wave winding.
 Lap winding.
 Both wave and lap winding.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.
 I1 = KI2.
 I1 = KI2 + Iμ.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
  line to ground fault.
 line to line fault.
 3 - phase fault.

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

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

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