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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 10%
 40%
 5%

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip2.
  directly proportional to slip.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 zero
 lagging
 unity
 leading

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 steady and unidirectional
 pulsating and unidirectional
None of these
 oscillating

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Armature voltage.
  Supply voltage.
  Field excitaion.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 3.
  12.
 7.
 4.

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