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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 more than 220 V
 somewhat less than 220 V
 6 V
 220 V

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 become execessively high.
 decrease.
 increase.
 remain unaltered.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the series field
 in parallel with the shunt field
 in series with the shunt field
 in series with the series field

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Stator winding.
  Rotor mmf wave.
  Both rotor and stator winding.
  Rotor winding.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = P/2*θmech
 θelec = 2/P*θmech
 θelec = 4/P*θmech
 θelec = θmech

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MORE MCQ ON Electrical Machines

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