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Lupin Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is the difference in MCB, MCCB, RCCB, ELCB, & MPCB (motor protection circuit bracker)

12 184608

what is the working principle of energy saver control panel. please give the complete calculation & theory.

1804

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<

1648

how to calculate the multiplying factor for energy meter with CT ratio given

23 252510

What is switch gear? How it is work ?

1 3765

comparision between ACB and VCB

1890

When we need up only in o/p 440v, so why we use directly in 11kva in input?

1253

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