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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.
 45 ppm.
 20 ppm.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 increase and decrease respectively
 decrease and increase respectively
 both increase
 both decrease

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3600 rpm.
 3000 rpm.
 500 rpm.

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Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 sin2δ
 cosδ
 cos2δ

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 any of the above
 hyperbola
 linearised

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