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Electrical Engineering Interview Questions

why white color LED light is not possible?

2732

operation principle of a generator? Gss, Diesel and HFO which is better and why?

3581

I do wonder why current is present in neutral wire?i check single phase lead current feeding air conditioner...on its phase its current was 10A while same was 10A in neutral...as we know in neutral voltage is zero so if voltage is zero then how current appears on amp meter? my second observation is (just imagination)when I touch phase wire it give me shock but when i touch neutral nothing happens although as above its carrying current(amps) third but with same logic...as in simple Alternate current sine curve there is + and there is negative peak.means every time phase changing so how come every time same phase and same neutral stand (pardon for english mistakes)

2659

what is mean by flux

2696

How many loops can be provided in a circuit as per IS rules.?

2281

how i meggar value of 11kv alternator winding.and with meggar.

2752

what is the purpose of using filters in a protective relaying scheme?

1297

How we can find the regulation of transformer?

2169

Why selected cable colour red yellow and blue in 3 phase Electrical system?

15618

What difference between voltage and current

3902

What is the Basic Difference bitween Long Shunt Connection and Short Shunt Connection in DC Generator?

1178

what iz second and fifth hormonics please explain

2127

why the generator operating along with the infinte bus bar should never be under_excited?

2089

how much GROUND & NEUTRAL VOLT maintain in data center.

993

how calculated Transformer losses.

983

Un-Answered Questions { Electrical Engineering }

1. A bomber drops a bomb from an aircraft flying at 2000 km/hr. at an altitude of 7km. The speed at which the bomb will strike the earth would be

1016

what is earth-fault?when it occurs? to check where it occurs what type of test should we do?

1155

I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....

1184

IN electrical field, WHAT ALL THINGS THE CUSTOMER WILL ASK WHILE ORDERING FOR LT PANEL (ALL TYPES OF LOW TENSION PANEL)

1144

Application Comparison between 22KV (UE)and 33KV (E) system. Are we allowed to use 33KV (E) cable in lieu of 22KV (UE) cable. What are the technical disadvantages.

1243

What is the role of power pack in substation protection system?

1716

Which Class insulation is prefered for the sandwich Busducts ? Why?

1027

What is the difference IN MCCB's between thermal magnetic and electronic tripping system ?

1069

What are the material used for inductance coil?

163

What do you mean by phasors?

168

why can we use cosine wave instead of sine in ac supply as both have same rms vale and ripple factor

1604

What are the types of control system?

147

why +24 v and -48 v give to BTS? If -48v protect from surge then why we not use -24 v?

963

if we give 60 hz single phase supply to the transformer used in europe , than what will happen

1068

if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?

445