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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/2.
 PN/60.
 PN/120.

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 18.25%.
 15.30%.
  16.67%.
 14.28%.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 2000.
 500.
 0.

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Electrical Machines
In DC machines shape of net flux density is?

 sine wave
 saddle shape
 peaky in nature
 flat tapped or trapezoidal

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 both 1and 2
 hysteresis loss

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Electrical Machines
A motor operates in stable region at which of the following slip?

 high slip region
 unity slip
 low slip region
 both 1 and 2

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