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Electrical Engineering Interview Questions

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

1359

How many points does a Circuit can have?

1303

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

2495

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

5786

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

3436

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

1258

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

2098

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

CS,

3113

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.

1491

What is a LBB protection and why it is used?

7528

what is a starter ??

NPTC,

3553

what main difference betwenn invetter & ups & major difference

ABB,

5504

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

2629

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

12432

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

1307

Un-Answered Questions { Electrical Engineering }

percetans

1542

What are the main faults of DC generators?

2128

how to find the Motor,s insulation Power?

1016

How to operate a ac chilar plant?

1793

what is meant by the phrase 'static load' in case of shorting in a generator excitation system?

1540

Explain about Dubai electrical sysaem? Explain about Dubai drinking water system? Explain about Dubai Burj tallest building Electrical,Water.etc.. maintenance system?

1440

Why is better to have a minimum ceiling voltage of 250% than 160%?

1240

what is cascade speed control device?and how this device control the speed of motors?

1358

can any one tell me about the Extra low voltage systems?From where we give supply to these type of systems??

1362

write circuit diagram for a motor rotate in forward direction once it started and when pressed the same button it should rotate in anticlockwise.

1901

size of condotory fron voltage level

1517

Hi,iam a diploma in electrical engineering.rtd from indian air force in apr 2007.prsently working in reliance next link as a network maintenance engineer since 2007,can i get a job in motherson sumi.

1688

why we change the direction of winding in rotor ?how we make the north and south pole?

1438

Dear all i want to know SEWA Electrical Supervisor Licence test Previous Year Questions ? If any body know please send to me zohairaukllah@yahoo.com

306

This is reqd for a 1MW Solar power plant..We have 2DC outputs from the solar panels Connected to 2INVERTOR panels.. Output from invertor is 3ph,280v,500kva,50hz.These are connected to individual ACB.This has to be stepped up to 11KV ,1250KVA SYSTEM.Now can I use (1) one more ACBTO GIVE A COMBINED OUTPUT OF 1000KVA,280V & STEP UP THE OUTPUT BY USING a single two winding 3 ph transformer 11kv/1250kva. or (2)use the two outputs and connect to one three winding transformer of above rating..Pls suggestwith details.

1836