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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
 low resistivity.
 high viscosity.
  low viscosity.

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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
Lap winding is prefered for which type of machines?

 high current and low voltage
 low current and low voltage
 low current and high voltage
 high current and high voltage

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC series motor.
 DC shunt and level Compound motor.
 DC compound motor.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a dc machine.
 rotor of an synchronous machine.
 stator of a induction machine.
 rotor of a dc machine.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 1/3
 3
 1/√3

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