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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 25 ppm.
 20 ppm.
 45 ppm.

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 18°
 30°
 72°

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Amperes law.
 Flemings right hand rule.
 Lenzs law.
  Flemings left hand rule.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under trailing pole tip.
 under the interpole.
 under leading pole tip.
 pole core.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
 Resistance split phase motor
All of these
 Capacitor start motor

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  thinner.
  rotor can not have any laminations.
  sipper.

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