why circuit breaker closing time is always higher then tripping / opening time.

13 Answers   United Phosphorus,

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What mean 150 amp hour write on battery.

1 Answers   Syncom,

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At light load transformer efficiency is less because A secondary output is low B transformer losses are high C fixed loss is high compared to output D copper loss is small

1 Answers  

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what is divercity factor?

4 Answers   ABB,

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What is the general power consumption rating of CPU CRT type and Flat type, Monitor,Printer, projector, Scanner?

0 Answers   HAL,

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On which side, taps are provided in tap changing transformers and why?

2 Answers  

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As we know induction squirrel cage motor torque Directly praprortinal to applied voltage in star connection & delta also. If I connect 55KW Motor to DOL starter in load condition does motor withstand the load & what will be the current withdrawn ? motor will not fail ?

0 Answers  

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How to apply 'c' license and also explain what is difference between 'c' and 'b'license.i am also working in one of the private company.i have finished my diploma in 2014 .i have already finished in ITI electrician course.....

0 Answers  

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How much kv gas generator is needed to run 2 hp and 1 hp airconditioners, plus a refrigerator and 4 Tvs

1 Answers  

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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

0 Answers   Lupin,

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if 300 hrs not comleted at wat interval b.c,d checks og take place

1 Answers  

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how we can improve power factor from 0.8 to 0.85 or 0.9 & how we identify its either lag or lead ? thank you

7 Answers  

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