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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmax to Imax.
 Vmin to Imin.
 Vmin to Imax.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum power.
 field winding will burn.
 the voltage generated will be zero.
 machine will generate maximum voltage.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.
None of these
 Both 1 and 2.

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  stainless steel.
  aluminium.
  phosphor bronze.

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Electrical Machines
Which of the following machine will have maximum efficiency?

 Induction motor.
  Electrical power transformer.
 DC motor.
 Electrical power generator.

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 resistance of armature culture.
 all of these.
 applied voltage.

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