1. how much normal earth resistance in earth pits(neutral and body earth) and transformer neutral and body earth & panel earth.

12 Answers   HP, Malladi Drugs and Pharmaceuticals, Pearl Engineering, PL,

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What is the lower limit of break-down voltage of converter transformer.

0 Answers   Tata Steel Limited,

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how we can find out the speed of fan without using any measuring instrument

2 Answers  

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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What is 11 N1 and 12 N2 in single phase Transformer ?

0 Answers  

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How to increase the backup of three phase ups?

1 Answers  

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differentional compound gernater used for wielding porpose. why????????//

2 Answers  

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what is static frequency converter?what is the function...of sfc...?

0 Answers   L&T,

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which motor have relatively high power factor and what is reason for have high pf? 1.capacitor run motor 2.shaded pole motor 3.capacitor start motor 4.split phase motor

0 Answers  

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In star delta Schematic can we connect OLR in delta circuit

2 Answers   ABB, Lanco,

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i want to make an elec generater with only 12v car battery car alternater and 12 volt motor ..... will the battery charge and give power at same time with out over charging the battery?

1 Answers  

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Define load factor?

0 Answers  

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