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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 V²
 1/V
 1/V²

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Electrical Machines
Conservator tank is used

None of these
 to take up the expansion of oil due to temperature rise.
 for better cooling of transformer.
 to act as an oil storage.

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
  silicon steel.
 wrought iron.
 cast steel.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing number of poles.
  increasing of frequency.
  speed can not be increased.

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

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 50
 100
 1

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MORE MCQ ON Electrical Machines

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