define displacement & magnitude ?

1840

why ct's&pt'S out put called as burden,why compelsary short ckt the secondary of ct's while removing the burden?

2265

what does a string of resistors in a series will do?

1213

how dose servo motor works

1918

why to use freewheeling diode ( diode in revers bias mode) across dc coil

5021

hi friend i am going too attend for hpcl in this month please help me by sending written test question papers i am in the stream of E.E.E

1979

Whata are the types of Cables?

2157

surge tank, hrc fuse, earthing transformer, firm power objective type

1638

What is synchro?

1170

how do i commission a distribution transformer knowing all its ratings and transformation ratios?d

4583

what is the differebt between ac and dc fuse?

2338

Why the efficiency of generator is more than motor in swinburne's test

2022

battery capacity use of made?

2544

PLEASE TELL ME ABOUT QUESTION PAPER OF UPCL ENTERENCE EXAM.

7969

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<

2155