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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
 32.
 8.
  4.

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 open circuit.
 short circuit.
 reduction in generated emf.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 any of the above.
 slip speed.
 normal speed.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 800 V.
 100 V.
 200 V.
 400 V.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and low
 high and high
 low and high
 high and low

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