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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/60.
 PN/3000.
 PN/120.
 PN/2.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous generator.
  asynchronous generator.
  asynchronous motor.
  synchronous motor.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara

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

 decrease
 not changed
None of these
 increase

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Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 1
 4
 8

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