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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/3000.
 PN/60.
 PN/120.
 PN/2.

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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

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

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 decreased.
  increased.
 remains same.
 kept constant to certain value.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

  DC of slip frequency.
 DC.
 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 draw a starting current many times its rated full load current.
 all of above.
 provide execessive voltage drop in line.
 damage the armature and commutator.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
  about 75°.
 90°.
 0°.

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MORE MCQ ON Electrical Machines

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