Electrical Engineering Interview Questions

when we supply in primary side of transformer then the supply goes in secondary side?how it works?

2867

how to protect motor in dol starter having capacity of 30 hp.40 hp?

2063

what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?

687

howmuch current can carry the 2.5Sqmm copper cable?

75114

what is mutual induction principle?

34920

What is the requirement of grounding the neutral of single phase generators on load? If the neutral is not grounded, what will be the effect?

HAL,

888

What is the difference btwn grounding and earthing?

HAL,

8508

Whats the principle of lightning? How protection against lightning is achieved? Types of protection? How to select the height of lightning spike? as per the area.

HAL,

7911

what is the differance of acb and mcb and mccb

24997

what is the function of a commutator in a dc generator?

61321

how we are measuring the winding temperature of the transformer?

26461

prefer any good electrical engineering book.....it should be useful in the practical fied?

7615

How to test Power Transfomer vector group in the field?

4203

how will u exactly calculate the unit consumption of the Air conditioners?Split/Window/

4534

what is Touch and Step voltages

2348

Un-Answered Questions { Electrical Engineering }

what is the difference between skin effect

956

sir,in our plant we r using SATEC PM172E power reading meeters in HT panel side it is monitoring the MB data smart viewer(sever).but last one week we did not get readings inthe server only available in meeter.tell me how communicate meter and server. and also what steps we take for checking.

875

What will be the size of copper cable (each for 3 phase and 1 neutral) from Service connection Kit-Kat to Panel Board (i.e. to main switch) for a 6 pole 3-phase AC induction motor of 200 H.P. capacity? Amp-255 A, Frequency:- 1450 rpm.

764

Dear sirs, pls check this 4-20ma to RS485 module datasheet,pls guve me some suggestions. http://www.szsunyuan.com/sy/pro_more.asp?Productid=539 Thanks. E-mail:yunianjiang99@gmail.com

782

A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.

945

what are factors to be consider in electrical installation like load factor,diversity factor .....

655

What is the general power factor & min. power rating of TV,LCD type TV, CRt type TV, Scanner, printer?

783

How to test IR testing & magnetic balance test

771

what is the step by step formula for calculating bus bar phase and neutral size of a panel board.suppose the incomer of panel board is 100A..???step by step answer please

1857

Can a generator rated 400 V, 60 Hz be used in a 50 Hz System? Yes or No ? Why ?

425

what is FS cable?? Difference between FS and FRLS??

1766

how to check ac servo motor

914

if voltage bt phase & nutral is 38v in a panel board . whats the root cause.

985

i have 500 amp inductive load of motors ,,,pleas tell me how can i calculate for capacitor bank for improving my power factor to 99 .....calcullations for capacitor bank,,,,

409

On Which Pressure PRV is operated.

441