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Electrical Engineering Interview Questions

where is the primary of CT??

2968

WHY BLADE & JOW OF ISOLETOR IN SUBSTATION?

2832

what will happen if instead of neutral we use earth wire as return conductor?if we can use ,then why we are not using in our day to day appliances?please justify the answer

NTPC, ONGC,

22652

In power generator sets, when they are coverted from 50hz to 60hz, the kva rating after conversion increases. For example, the manufacturer of a perkins 200kva @ 50Hz generator set has mentioned it to become 220kva after converstion to 60hz. What is the relation between the frequency & the KVA rating. Any formula please.

5137

why is the earthing pin on 3 pin top are big and thick

4529

1 Amp = kva ? 1 Amp =KW ?

9514

how u measure/calculate renge of capacitor,capacitor has no any rating tag.what is the theory of measure of capacitons.

1047

have u any web site who can give all electrical sum's to solve counting easy like how to convert 1kw=?Kva.

2158

What is the Full form of Rccb,MCCB,

53326

limitation of conductor height on ground when we consider EMC

996

why the pressure coil is not present in the three phase wattmeter?

2017

where the lexical paramater will use in fron end?

959

What is meant by (2 x 185) AYFY cable

ONGC,

3733

why there is a 2 slits in three pin's earthing pin?

2053

what is the meaning for va and how it is generated

2330

Un-Answered Questions { Electrical Engineering }

if an insulated power and control cables of a running gas diesel gensets laid direct in an open trench i.e, trench bed is not rcc of a power house in which rain water, spillage water alwas exists and all power control cables remains submerged even when gas gensets of 480 kw each runningin on load. These power &control cables runs from power house to switchgear room through these trenches in which water remains most of the time. pl explain its merit & de-merit

1011

IF alternator SCR value will be high means what happen in alternator efficency at operating power factor of 0.8

2892

What happens if we run alternator on under frequency?

1155

How many types of faults are there in 3 phase power system?

163

When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?

1145

what do you mean by plant earthing system.

1075

What is primary and backup protection?

174

how many parameters can integrate with fire alarm basically ?

1038

what is difference between line differential and transformer differential?

745

How to calculate the time setting for star connection in star delta starter? For example 10KW 3PH Induction motor.

1613

Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation?

1231

I have 4 busbar of 1000 ampere. we use 4 busbar to make 4000 ampere in one phase.my problem is that when we applied 60% load on that then busbar produced high noise.what is the reason of that and how can i minimize that noise.

859

What are the different power system losses and how can it be eliminated?

1088

Is it possible to operate a synchronous 2-poles turbogenerator with a still-in-place faulted bar but electrically disconnected ???? If yes, should I act on the other phases as well ???

976

HOW TO DESIGN THE body EARTH cable(Copper Conductor) size for 60KVA UPS?

1052