Answer / b.sudhakaran

A Check & B check for DG set, A check means daily check for dg Like diesel level,oil level, radiator water level, Dg room cleaning, air filter checking, and all value position ( open or close condition check above state.now you switch on primary motor for 5mints( for oil lubrication purpose) now you can switch DG for 5mints this is for A check, B check means 300 hours for dg or every 6month that time replace oil,oil filter, diesel filter and check air filter pulse A check this is b check.

Answer / k.prakashchandra

They are periodical checks.'A' may be daily and 'B' may be
weekly.The checks are specified by the manufacturers for
maintenance purpose.They may be called as maintenance schedule

what is the formulae for calculating the cable size for a given voltage and current.

4 Answers   Bharat Forge,

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if u give d.c. supply to transformer primary then what happen.&why??????????????

4 Answers   DCS, DRDO, HCL,

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A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

0 Answers  

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why DG sets power factor is 0.8 lagging.

1 Answers   Cummins,

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if we look on phasor of the transformer vaoltage is 180 oppsite at primary and the secondary so to improve a power factor is secondary should kept negative to improve it primary side means is -.90 became +.90 at other side

0 Answers  

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why pure sine wave inverter used for desktop ?

1 Answers  

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why do we need a 4th wire in 3phase 3wire transmission line

6 Answers  

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Explain M Var? Which types of problem occurs when reactive power increase at the time of full load of plant and at the time of synchronize of plant?

0 Answers  

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what is phase and neutral.

2 Answers   Birla,

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sir i applied for hpcl(electrical).i want to know from which subjects most of the technical que will b asked.and pattern of the written test.pls help me

0 Answers   HPCL,

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how to find motors H.P. whout any rating? (only give you a motor and multimeter)

3 Answers   L&T,

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how many earthing is required for sever room?

4 Answers  

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