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Electrical Machines
A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current
Woud be equal to 2If1.
Would be equal to If1/2.
Cannot be predicted due to insufficient data.
Would be equal to If1.
Woud be equal to 2If1.
Would be equal to If1/2.
Cannot be predicted due to insufficient data.
Would be equal to If1.
Answer
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Related Question
Electrical Machines
Which of the following machine is invariably provided with forced ventilation?
Fractional horse power high speed motor.
Hermetically sealed motor of refrigerator.
50 MW generator in a power plant.
Fractional horse power slow speed motor.
Fractional horse power high speed motor.
Hermetically sealed motor of refrigerator.
50 MW generator in a power plant.
Fractional horse power slow speed motor.
Answer
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Electrical Machines
A compound motor has
only shunt field winding.
both shunt and series field winding.
only series field winding.
tertiary winding.
only shunt field winding.
both shunt and series field winding.
only series field winding.
tertiary winding.
Answer
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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?
Field resistance control.
Armature circuit resistance control.
Any of above.
Armature voltage control.
Field resistance control.
Armature circuit resistance control.
Any of above.
Armature voltage control.
Answer
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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to
reactance voltage induced in the coil.
coil resistance.
None of these
armature emf.
reactance voltage induced in the coil.
coil resistance.
None of these
armature emf.
Answer
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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will
remain nearly constant
increase gradually and then stay at rated voltage
increase to rated voltage and then may decrease
decrease
remain nearly constant
increase gradually and then stay at rated voltage
increase to rated voltage and then may decrease
decrease
Answer
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