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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  both.
  larger output.
  none.

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
 filter the transformer oil.
 absorb moisture from air entering in transformer.
  absorb moisture of air during breathing.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.
  Torque increase and speed decrease.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 ratings
 per unit impedance
 efficiency
 leakage reactance

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

 oscillating
 pulsating and unidirectional
None of these
 steady and unidirectional

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Electrical Machines
Series generators are used in which of the following applications?

 Air crafts.
 Arc welding.
 Used as boosters in dc distribution or transmission.
All of these

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