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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
 rotor resistance R
 both 1 and 2
None of these

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 decrease
 either increase or decrease
None of these
 increase

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 infinity.
 zero.
 two.
  unity.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

None of these
 decrease
 not changed
 increase

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
  2 KW.
 8 KW.
 10 KW.

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