Electrical Engineering Interview Questions
Questions Answers Views Company eMail

if two transformers are placed parallel & both have fault impedance of 50KA will it increase or decrease show example?

1496

How many points does a Circuit can have?

1426

if two transformers are parallel & both have fault short ckt. impedance of 50KA in each case will it increase or decrease show example?

1 2738

How many points can we have in AC Circuit? Show by giving suitable example?

3 6301

-----------means a source which can supply a constant voltage to aload irrespective of the valu of load resistance.

2 3743

will there be any problem by recovering slip from single phase induction motors?

1408

What is the electrical difference between Earthing Switch (ES) and Maintenance Earthing Switch (MES)?

1 2347

how we calculate the knee point of a protection and metering CT and what is the testing procedure.

CS,

1 3440

HOW WE KNOW IN PHYSICALLY THE CONTACT SURFACE OF A VACUUM INTERRUPTER IS GOOD OR GOING TO DAMAGE IN A VCB AFTER ABOVE 500 TIMES OPERATED.

Areva,

1621

What is a LBB protection and why it is used?

Gridco,

2 8252

what is a starter ??

NPTC,

2 3832

what main difference betwenn invetter & ups & major difference

ABB,

2 5809

Dear sir, I am working in wind mill division , pls explain Pls explain in details with formula My question is Wind speed 3.5 M/s Gen RPM is 1500 ( 25 K/w Production ) Wind speed 12 M/s Gen RPM is 1500 ( 220 K/w Production ) Why in 3.5 m/s generation was low , why in 12 m/s generation was high , Pls dont explain wind force or wind density , that one already i know For the above question RPM was same why the KW was different Answer : 1. Its depends on the density ( Force ) of the air Sir , Pls explain wit Formula sir

Vestas,

1 3012

why stay insulator is not used with stay wire for 11kv Lines. Whereas it is used for LT lines ?

Essar,

2 12944

Why are cables rated for 40 KA for 0.25 Sec fault current rating?

1484


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Un-Answered Questions { Electrical Engineering }

What is the formula to calculate the rating of a three phase air circuit breaker

1789


To make a basic instrumentation amplifier, it takes A One op-amp with a certain feedback arrangement B Two op-amp and seven resistors C Three op-amps and seven capacitors D Three op-amps and seven resistors

1500


why the making current is more than then the breaking current and if its true then its about a controling circuit or breaker power contact points

1587


Which are resistive loads & which one are inductive loads : Refrigerator, Split air conditioner, ceiling fans, well pump, fluoresecent bulbs, T.V, CRT Monitors, Adsl Routers, C.P.U, Printers, Deep Freezers, Speakers, DVD Players, Microwave oven etc. ? Output Power for these Appliances Would be same like this : P = V * A * P.F Or would be changed ? thanks

3371


What are stable systems?

604






in control scheme dc logic wiring commonly using negative loop,what is the reason?if we use positive looping what will happen?

1824


Why does increasing the magnetic flux in the main field of a d.c motor cause the armature current to reduce??

1490


What are the advantages of vscf wind electrical system?

596


Write the force balance equation of ideal dashpot element.

811


My load is 1635 KW. & current pf is 0.884, I have to improve it for 0.99.Please suggest what KVAR value is needed?

1156


How many types of instrument cables are there?

600


what is meant by 2 within a star in a voltmeter dial?

1482


Where voltage are high and current to be interrupted is low the breaker preferred is:

1754


Differentiate between induced emf and self inductance?

573


how can we change the polarity of Alternating current rapidly? how frequency of ac can be controlled and changed easily?

1548