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?

658

How many points does a Circuit can have?

680

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

1 1538




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

3 2337

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

2 2183

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

617

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

1 1022

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

CS,

1 2132




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,

754

What is a LBB protection and why it is used?

Gridco,

2 5881

what is a starter ??

NPTC,

2 2463

what main difference betwenn invetter & ups & major difference

ABB,

2 4229

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 1679

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

Essar,

2 9569

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

661


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Un-Answered Questions { Electrical Engineering }

what the Microsoft .NET framework is?

633


HOW TO CALCULATE THE REGULATION OF 100 AND 25 KVA TRANSFORMER

620


HOW DO I CALCULATE THE SETTINGS FOR THE DIFFERENTIAL PROTECTION OF A 12kV/6.6kV, 6MVA,DYN11 XMER WITH PRIMARY SIDE CTR 400/1 AND SEC SIDE CTR 600/1?

1380


What is the formula for calculating the Instantaneous Short Circuit & overcurrent for any breaker

733


what is difference between window type and wound type transformers?where we will use window type and wound type transformers?

887






Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??

214


I am having a 42KW 3 phase electrical heating furnace, heating element is 80/20 nichrome material, my connections is made in such a way that 2 star connection compromising 2 coils per phase so totally 12 coils, shall if i use it unbalanced star condition (instead of 2 group of 3 phase or 1 group of 3 phase, connecting 4 phases of 5 phases) what will be the consequences and is it acceptable?

449


is it possible to start a motor in felid connected to a remote mcc

602


how to decide choke rating for drive?

1012


why does a dc machine has high efficiency while working as a generator than as a motor ..

689


How can we design a HVAC Plant room which includes AHU,FCU,Chillers,Cooling towers, Pumps etc & how will they work? any Drawing if possible?

998


hi , i have 150 kw loud and we need 50 m cabil,i want to know wich size cabil we use. thanks

678


my project load is 6 MW so please suggest the size of cable.. ALU 3c 400 aqmm cable can be sufficient.. is there any thumb rule for calculation of cable size please help me

402


How cable from Kit-Kat to main switch, from starter to motor are designed?

721


What descriptive information does the NEC require to be marked on all conductors?

633