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Electrical Machines

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

  35 ppm.
 45 ppm.
 25 ppm.
 20 ppm.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed rises.
 improve and the speed rises.
 deteriorate and the speed falls.
 improve and the speed falls.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 Eb is unchanged, but Td is zero
 both Eb and Td are zero
 Eb is zero, but Td is unchanged

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  either field terminals are reversed or armature terminals are reversed.
  only armature terminals are reversed.
  only field terminals are changed.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 1Ω.
 0.5Ω.
  0.23Ω.
 0.25Ω.

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

 Lenz's law.
  Fleming's left hand rule.
 Fleming's right hand rule.
 Ampere's law.

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