Answer Posted / urvish mehta

basically motors used in fans are 1-phase induction motor...$ this 1 phase induction motor can not start itself .....it need some equipment which provides necessary phase shift between its stator & rotor.....capacitor serves this purpose in fans....

In AC if the direction of current keeps reversing every half cycle, how does it propogate through the transmission lines?

2147

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is it possible to test of bus bar in high rise building without completed full floor ?

1699

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why ups rating in kva? and why ups are in parellel?.why isolation transformer is used in ups?

1941

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What is the most important precaution in any experiment with d.c. Shunt motor?

1265

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What is superposition theorem?

1193

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Draw the wave shape of armature current in a generator subjected to a sudden three phase short- circuit at its terminals. Define various reactance of generator from this wave shape.

2225

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State kirchoff voltage law?

1125

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how to test reverse power trip?

4470

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how to calculate voltage drop and followed by cable calculation?is there avail in formula?

2069

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What are protections for dty type transformers

1835

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I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

1873

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how does the thyistor work in dc drive?

1985

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1665

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If Polarization index of motor 8.75 at 500volts of medium voltage 4.16 KV motor what this mean winding good or bad pl answer if any reffrence book give me the link

2121

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How many double suspension hardware fittings are required on a double circuit transmission tower?

1928

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