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hi.. i am krishna. i've complide my diploma engg.in
electrical.i applied many places for jobs.but i am always
fear from written test.ican't get success in it. i think my
basic engg. is weak..show me some idea please..!
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Answer Posted / g c ashok
Dear krishna,
Befor attending the written test.. go through previous
ques paper and select the most common ques in ur fld.
Became a master in that fld,, that'll help u at the time of
interview also.
All the best....
G.C.A
| Is This Answer Correct ? | 2 Yes | 2 No |
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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<
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