Answer Posted / visakh.t.v

Single phase motors are desined for work only in single
phase supply , that is It conist of two windings. starting
winding and running winding.They are arranged in 90
electrical degree degree phase shift. And the input cables
are only two for phase and neutral.But in the case of Three
phase motor consist of Three windings they are arranged
in 120 electrical degree phase shift.and 6 No.s of input
cable for connect either star or delta.

what will happen if the prime mover on the field excitation of the on-coming generator fails?Explain.

5604

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Define pole pitch?

1168

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What is an iron loss or core loss pi?

1174

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what are the parameters plays a major role in Potential transformer Burden calculation??

2271

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How is magnetic leakage reduced?

1228

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What are the advantages and disadvantages of the dc motors?

1181

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some basic standard questions on transformer.

1852

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What is the universal motor?

1156

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how will calculate the safe starting current of 3-phase squirrel cage induction motor?

1965

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A powerplant has 8 gensets operating in grid parallel mode. In one genset sometimes there is pf variation and kvar variation. The plant operates in pf mode. When this variation is observed the load is stable, voltage is also stable, freq and genset speed is also stable. How will you check the functioning of pf card. What shall be the ideal output vdc of the pfc, from there it is input to AVR?

2383

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in Telecom DC system-why positive +ve is made earthed.and - ve is fed to load.

2764

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What is the requirement of grounding the neutral of single phase generators on load? If the neutral is not grounded, what will be the effect?

2156

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Whether IP65 enclosure box blocks ventilation if driver for LED have to enclosed inside IP65 box

2149

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What are the advantages and disadvantages of the ac motors?

1194

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how does it help for selection of a transformer.

1899

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