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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 3Fmax.
 (1/2)Fmax.
 Fmax.
  (3/2)Fmax.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

 shunt connected.
  deferentially compounded.
  cumulatively compounded.
  series connected.

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor.
  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thin
 less and thin
 less and thick
 large and thick

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Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Armature resistance.
 Residual magnetism of the generator.
 Field resistance.
 None of above.

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