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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is basic difference between Soft Starters And VFD drives?

IBM,

19 46721

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

 10 14104

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 29590

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 3218

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 6545

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

 6 6528

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

ABB,

3 5044

What is the difference between RMS and average value

CEERI, HPCL,

5 36404

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 5493

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

 6 7984

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

 1 3667

Why not implimenting power factor in Diesel generator

HP,

6 9288

how vfd drives energy save

PowerTech,

5 8968

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

 1 4292

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 70333

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Un-Answered Questions { Electrical Engineering }

How to measure current and voltage in an ELV circuit

3604

Explain what is electric traction? Explain few advantages of electric traction system?

597

what is the maximim current drawn by 1 phase and three phase welding machine

1438

I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....

1635

What is Percentage impedence of a transformer? why it is expressed at a percentage? what is the importance of percentage impedence in case of a transformer?

1420




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

1607

Write the force balance equation of ideal spring element.

768

how to handle 2500 kva transformar

1128

how you will decide the distance between the power transformer and its fencing

1449

What do you mean by a phase angel of instrument transformer?

629

What is meant by stator? What is meant by rotor?

615

CAN ANYBODY PLEASE TELL ME HOW TO DESIGN A SERIES REACTOR FOR LIMITING SHORT CIRCUIT FAULT CURRENT??

1441

From past few months I am getting lagging pf even though sufficient capacitors used in circuit. Where is the problem pls answer

924

what is the constructional difference between a power transformer and potentian transformer?

1249

Explain the propagation of harmonics in the network and influence of phase angle of harmonics.

1488

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