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Electrical Machines
What is/are the advantages of parallel operation of alternators?
continuity supply is maintained
All of these
Increase efficiency under light load conditions
Increase in reliability
continuity supply is maintained
All of these
Increase efficiency under light load conditions
Increase in reliability
Answer
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Related Question
Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will
increase to a value greater than 1.25 times 220 V
increase to 1.25 times 220 V
not change and remain at 220 V
increase to value lying between 220 V and 1.25 times 220 V
increase to a value greater than 1.25 times 220 V
increase to 1.25 times 220 V
not change and remain at 220 V
increase to value lying between 220 V and 1.25 times 220 V
Answer
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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be
0
1
2
3 or 4
0
1
2
3 or 4
Answer
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Electrical Machines
DC machine is a
conduction machine.
none of above are correct.
convection machine.
both are correct.
conduction machine.
none of above are correct.
convection machine.
both are correct.
Answer
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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their
KVA ratings are equal
percentage impedances are equal
turn- ratios are exactly equal
polarities are properly connected
KVA ratings are equal
percentage impedances are equal
turn- ratios are exactly equal
polarities are properly connected
Answer
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Electrical Machines
Transformer oil is used as
a coolant.
both A and B.
an insulator.
inert medium.
a coolant.
both A and B.
an insulator.
inert medium.
Answer
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