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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 BRY
 BYR
 RBY

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
  salient.
 none of these.
 non uniform cylindrical.

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous motor
 hysteresis motor
 reluctance motor
 3-phase synchronous generator

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
  0 Volt.
 2000 Volt.
 1600 Volt.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  500 rpm.
  3000 rpm.
  3600 rpm.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.
 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.

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