Electrical Engineering Interview Questions
Questions Answers Views Company eMail

How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?

Siemens,

1730

What will happen if we do not provide earthing to the newtral of a power system ?

Jindal, NPCIL,

2 4730

What is the difference between newtral earthing and body earthing?

JK Lakshmi Cement, NPCIL,

3 5594

give me battery AH calculation in U P S

1 3658

what is the difference between relay and a contactor.

Siemens,

5 15189

what is the sludge current

1529

check list for anuval maintatince check list of oil transforms

2 3381

can volts/Hz be relied upon to use 460v,60Hz electric motors on a 380v,50Hz power supply?

1 2933

Where double earthing is required? Is there any power specification to have double earthing?

Delphi,

10 44960

What will hapen if we connect more capacitors than required for powerfactor control? Exactly what will be the effect on power system?

Mandovi Pellets,

2 4310

what is a panel board?

1 2972

Can u explain : how capacitor act when the supply is given is a.c and d.c. I know that when d.c supply is given then the capacitor charges and becomes open circuited. But please say about when a.c is given. I have seen that when a.c supply is given ,it charges and discharges, But when we plug in capacitor to our daily supply and take it out ,then we join those wires spark will appear,which seems charge is present ,but when a.c is given it should charge and discharge

3 3662

can we use the step down transformer to step up transformer

6 6796

How to design the earth grid for lightning protection in an industry

2 3663

can we run all LT motors at 360 volts which are normally rated 415+/-10% voltage rating

Meinhardt,

2 3187


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Un-Answered Questions { Electrical Engineering }

how we can calculate the efficiency of a diesel generator ?

1145


Load transfer in 11kv double busbar switchgear - operation.

1472


what is the standard duration after failure EB power

1326


Name two types of electrical analogous for mechanical system.

696


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

1533






what is power factor ? how we can calculate the low power factor and amount of capacitor for improve that low factor ?

1063


Difference between On Line capacitor and Station Type capacitor.

1594


explain types of electric welding and its applications

1177


When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?

1335


If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?

907


if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

1439


How generating electric power export to grid from the generating station ?

1382


HOW TO CHECK THE VECTOR GROUP OF A TRANSFORMER YD11?

3122


how to calculate the breaking capacity of different breakers.

1672


what will be project cost for 100 kv transformer connection under oyt scheme.

2383