Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

What is basic difference between Soft Starters And VFD drives?

IBM,

19 52544

Between Star-Delta & Star-Star Power transformer which one is efficent for Earth Fault?

10 17291

Why we are use 11KV / 22KV / 33KV / 66KV / 110KV / 230KV / 440KV this type of ratio. why cant we use other voltage ratio like 54KV / 99KV et.,

College School Exams Tests, Hino, ITC Infotech, Reliance, UPRVUNL,

8 32260

From the point of view of accuracy in the Measurement of Electrical energy should we select a potential transformer or a capacitor voltage transformers?.Kindly support your reply with reason and justification.

1 4050

HOW DOES ONE SELECT A TRANSFORMER PHASOR GROUP IE, WHETHER A STAR-DELTA TR OR A STAR-STAR OR A DELTA-DELTA, ETC. TRANSFORMER IS MORE SUITABLE FOR A PARTICULAR KIND OF LOAD OR WORKING CONDITION???

KPTCL,

3 7957

What is the secondry voltage of 420kV Current Transformer , the rated current is 2600A

6 8443

1. what is the power factor and whatis his losses 2. what is the working procedure of 51RNB AND 87 relay

ABB,

3 6470

What is the difference between RMS and average value

CEERI, HPCL,

5 38668

When geneartor is running in poor lagging side power factor its excitation current increases then it is running in improved lagging side.Kindly tell me when gen is running in leading side what will happen

3 6823

Can any body tell me about Hi-pot test, and why it is necessary and its procedure of testing

6 10141

Can any body tell me about partial discharge test, and why it is necessary and its procedure

1 4535

Why not implimenting power factor in Diesel generator

HP,

6 11336

how vfd drives energy save

PowerTech,

5 10716

in slip ring motor if motor specification is given how we calculate its rotor resistance in starting

1 5063

If single phase voltage level is 230V than why three phase voltage level is not 660V ?, but it is only 440V.

BSNL, DOS, EFS, HMT, L&T, TCS, ThyssenKrupp,

16 75652

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Un-Answered Questions { Electrical Engineering }

is it necessary to earth the rmu before cutting off the transformer winding?if yes why?

1985

If any cable burnt how can we identify it burnt by high current of high voltage?

2494

how line turns ratio changes in 3 phase with change in connection

2028

explain with diagram how to protect transformers and substations from over current with help of CT's?

2017

What are Contactors? How they works and what its highest rating?

2220

why magnetising curve not start with zero voltage?

2356

State angle criterion.

1182

how can check the resistance of battery contact?

2271

in conventional fan regulators how the current varies with speed?

2043

Why Stabilising Resistor used in REF circuit ?

3397

What are the types of the glands and difference between single and double compression type of cable Glands.

2133

how many joints are allowed in underground HT cable of 1 KM

1927

How RTCC panel is working and give single line diagram for RTCC with transformer?

3153

Explain about retrofitting of machine tool.

1960

Who are the manufacturer for Nitrogen based Fire Protectio/explosion prevention for Oil Filled Transformers? India and international both?

1978

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