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Electrical Machines

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

 45 ppm.
  35 ppm.
 25 ppm.
 20 ppm.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 increase.
 decrease.
 become execessively high.
 remain unaltered.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 less than
 greater than
 any of the above

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

  375 Ω.
 145 Ω.
 225 Ω.
 150 Ω.

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Electrical Machines
Oil is provided in an oil filled transformer for

  insulating.
 lubrication.
 cooling.
  both cooling and insulation.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 as it carries large load current.
 in order to reduce eddy current to provide large flux.
 to provide large flux.

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