Answer Posted / a.v.s.ramesh

because, when a.c supply is applied to a battery , the
battery gets charged during the positive half cycle and
gets discharged during negative halfcycle of a,c
supply .that's why a.c supply is not suitable for charging
the batteries and d.c is suitable.

Why 9KV surge arrester having 7.65KV of MCOV?

1515

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what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?

2381

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A d.c. Shunt motor is found suitable to drive fans because they require?

1236

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Explain thin film resistors and wire-wound resistors

974

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before synchronizing an alternator,power factor is leading ,why?

1498

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how brushed dc motor operating ?

1825

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Why corona leads to production of Ozone and glow of the color VOILET?

1915

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is there any current and voltage drop on liquid resistance starter water/soda tank ?

1931

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What are the difference between normal application Transformer and Solar application Transformer?

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High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?

2039

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what is the minimum requirement gigaohms for the insulation test using 5kv in 300mm xlpe cable

1928

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Match the following a)(X'+Y') b)X'Y' C)XY 1)NAND 2)NOR 3)Carry

1849

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if negative of DC supply used and positive is grounded through EGB, and if ELCB used in the system then is it sense the positive volatge and get tripped is it possible?

1777

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During Testing of Maintenance Free Earthing, How deep should be the Spikes of Earth Test Meter should be inserted in the soil(one spike is 15 Meter & Other spike is 30 Mtrs away from the Main Earth Electrode. Because, recently, we observed that when spike is inserted 3-4 Inch in the earth- results are better, If spike is inserted 1 feet deep than results are increasing.

1884

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what is Insulation monitoring device. where it is used? (in switchgear room or control panel or in field equipment)

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