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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmin to Imin
 Vmax to Imin
 Vmax to Imax

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

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.4
 0.02
 0.2
 0.04

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 4.
  8.
 2.
 1.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Universal motor.
  Slip ring induction motor.
  Reluctance motor.
  Synchronous motors.

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Electrical Machines
The application that need frequent starting and stopping is

  jaw crushers.
  paper mills.
  lifts and hoists.
  blowers.

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