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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
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T ∝ V
 T ∝ 1/V
 T∝ V²

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  √Ia.
  1/Ia.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 cumulatively compounded generator
 differentially compounded generator
 shunt generator
 series generator

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Electrical Machines
The functions of inter poles are

 both 1 and 2
None of these
 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and zero power factor tests.
 open circuit and short circuit tests.

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