Answer Posted / sudheer

we can calculate lux level by lux meter.

Total lumens required= A . E . D/U where,
A = surface area(sq.m)
E= illumination(lm/sq.m)
D= dipriciation factor
U= co-efficient of utilization

Why transformer used in UPS??

1527

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Refernce currents are to be generated using refernce cueernts how can this be done??

1952

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i am completed diploma in ece,and working in ht and lt lines.so is elligible diploma in ece for get electrical C Licence?plse give ur opinion?

1836

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how unidirectional torque is produced in DC motor?

6728

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how does commutator convert a.c to d.c?

2153

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what is meant by directional earth fault and non directional earth fault? describe both.

1841

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This is reqd for a 1MW Solar power plant..We have 2DC outputs from the solar panels Connected to 2INVERTOR panels.. Output from invertor is 3ph,280v,500kva,50hz.These are connected to individual ACB.This has to be stepped up to 11KV ,1250KVA SYSTEM.Now can I use (1) one more ACBTO GIVE A COMBINED OUTPUT OF 1000KVA,280V & STEP UP THE OUTPUT BY USING a single two winding 3 ph transformer 11kv/1250kva. or (2)use the two outputs and connect to one three winding transformer of above rating..Pls suggestwith details.

2421

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Convert a star connected network into a delta connected network.

1061

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What is BusBar integrity test and how it is conducted?

2156

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what is the safety points of vaccum circuit breaker.

2024

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sir, 3phase induction motor takes different pf and different KW in three phase while running,explain reason

1419

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How to calculate loses in transformer of 160 KVA ?

1609

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1.What will be stored in online ups EPROM IC?

1993

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What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.

1292

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for 750 kw LT load what will be the ht kva

1594

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