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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V2
 V
 f

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

None of these
 increase
 either increase or decrease
 decrease

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  sf.
  s2.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 4 and 2
 2 and 2
 4 ang 1

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  cage.
  wound.
  linear.
  none of these.

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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
 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
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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