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Electrical Machines

Electrical Machines
Example of double excited machine is

 Synchronous motor.
 Both are correct.
None of these
 DC Shunt Motor

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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/2.
 PN/120.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
  Shunt.
 Compound (cummolative).
 Series.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Semi closed slot type machine.
 Open slot type machines.
 Any of the above.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 flat-topped
 co- sinusoidal
 sinusoidal

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 throughout the air gap.
 interpole region.
  region under main pole.
None of these

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