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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

If we want to change a contactor of faulty one what are the conditions want to fullfil

Qatar Shell,

1383

A 11 KV motor is working. if the supplay is fail. what will happened with it's breaker? Trip / remain the same condition?

4 4927

A 6.6 KV motor breaker is try to Drack OUT by me while the motor running. What will Happened? a, will Trip. b,Drack Out lever will not access c, will get shock d, noting will happened

4 5224

If I want to buy a new Xformer for my plant what are the main parameter will I need to check?

1299

Why the motor take high starting current for long time(10- 15 sec) which is connected to Blower as compaire with a motor which is connected with pump with same rating?

2 3558

Why a motor blower cobination draw more current at winter than summer?

1 3035

in the case of 6.6kv motor starter combination contain fuses on it VCB. but in 11KV motor starter combination Fuses are not using in it's VCB why?

1549

what is the different between RCCB & ELCB

3 5910

why HT motors are earthed only at equipment side & for it's single core cable with aluminium wire armoure using?

Legrand, NLC Neyveli Lignite Corporation Limited,

1 3182

why Batteries & Battery chargers are used in substation? what is the different between UPS & battery charger?

DLF,

4 48709

In the case of petrochemical area AC drive & AC motor is used where the speed variation is required. Why they are not Using DC drive & DC motors in such areas?

1 3293

which one is more efficient, torq, power & ecnomy with the same frame size AC motor / DC motor?

1514

what is the minimum (Common factor) insulatin resistance of the following a, 4mm sq wire b, cable from 50 mm sq to 800mm sq

1379

what is power plant?

2 3767

What is difference between incomer & outgoing type Vaccum Circuit Breaker?

VBG,

2 17235


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Un-Answered Questions { Electrical Engineering }

What is meaning of out of phase (making & breaking) capacity And how to calculate

1457


what mean by analog ,digital,numerical meters and relays? say the example?

1531


What is the test block protection relay if any body know plz explained

844


What is the Diff. btw Manule Pull Station & Manule Abort Station Switches used in FM200 System??

1174


I HAVE A 50A MCCB AS PER DESIGN LINE WIRE CONNECT UPWORD SIDE AND LOAD IS CONNECTED TO DOWNWARD SIDE TO THE MCCB.IF NOW ANY ONE CHANGE SUPPLY & LOAD(WISEVERSA) WHAT HAPPENS ? DOES MCCB OPERATION OR WORKING FUNCTION NORMAL IF YES THAN WHY THERE ARE MARKED LINE & LOAD ON MCCB.

1714






what is the difference between STAR and DELTA connection and application wise how it can be utilizedd

1559


A cotter joint is generally used to transmit

584


Why is voltage is required to be within permissible range for an electrical equipment?

1099


Merits & Demarits of Oil circuit & Air circuit breakers ?

1433


please I wont know how to calculate the vector group for power transformer ZNyn11 best regard.

1040


Battery is a voltage source? give one example of current source and why?

849


why burdens of VTs is more than CTs?

1115


What is the tests required for a 132 kV, 400 kV , 765 kV for a Circuit Breaker and Power Transformer before commissioning ?

1008


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

1364


What is the practical way to calculate the cable size for known ampere load?

765