Electrical Engineering Interview Questions

How big (size) can the tertiary winding be in transformer? Can we load the tertiary winding, if yes then how much we can load it?

4620

What are the causes of unbalanced current on 34.5kv feeder Ia=0.05,Ib= 0.25, Ic=0.15 and In=0.27 prior to tripping current are balance?

1374

wht is meant by sh6

3918

What is an isolation transformer?Why do we need isolate circuits?Where do we use them?

5318

why the value of impedence is taken as %impedence in fault currrent calculation

2490

why use phase displacement in transformer.and effect of phase displacement on transformer

IOCL, ONGC,

2376

I have raw material for making Compact-Choke for flourscent lamp of 40 Watts. We are suppose to get 0.4 amps output at end. but we are getting 0.42 or 0.44 amps and above. We have done many testings in different but nothing worked out. Please suggest me how to get the correct output. We are using 1. core winding of 700 windings of aluminium 2. E-shape iron fillings and I-shape iron fillings to surround the winding.

6692

what is the difference between STAR and DELTA connection and application wise how it can be utilizedd

1785

how the vaccum ckt breaker workes..? how the arc is quenching in it?

3625

what is differant beetween overload current and phase current?

1824

why the no.of slots in stator in not equal to the no. of stator in rotor in induction motor????

19678

If i switch on a transformer but with no load connected to the secondary path.Is the transformer will burn?

6668

how we select HRC FUSE ?

AXA,

5292

how digital four pin earth resistance tester works

4215

what is difference between low voltage and high voltage

30695

Un-Answered Questions { Electrical Engineering }

with 3 phase board on a 63 amp rcd is it ok to have 6 electrical showers 2 on each phase and what problems could happen

1455

clarify types of motor operated valves and advantages

1510

1.main parts of generator? what is used A-check,B-check,C- check? 2.what is FM200 system in data centers? 3.difference between pac,ahu?

1717

What should be the percentage increase in length of the dead end clamp for bus bar conductor (Hawthorn) after hydraulic pressing and what should be the applied pressure?

1499

what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?

1529

why are u join ntpc

1777

11kv/433v delta/star distribution transformer primary side full load Ht current is 83.33A in , but input side VCB rating 800A.why?

1261

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

1463

which VFD is better ( LT or HT)

1648

Define the term Capacitance and Inductance?

709

What is turn ratio of a transformer?

721

Explain about 3 phase motor fault current calculation with examples?

2475

Can we put 3 layers of cable tray while installing tray

1988

how to determine Sq.mm size of finolex power cables.

1588

we need a ntpc previous papers

1491