Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is basic difference between Soft Starters And VFD drives?

IBM,

19 46608

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

10 14032

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 29478

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 3186

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 6511

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

6 6492

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

ABB,

3 4995

What is the difference between RMS and average value

CEERI, HPCL,

5 36360

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 5457

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

6 7950

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

1 3645

Why not implimenting power factor in Diesel generator

HP,

6 9219

how vfd drives energy save

PowerTech,

5 8921

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

1 4270

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 70219


Post New Electrical Engineering Questions

Un-Answered Questions { Electrical Engineering }

why Current is lead 90 degree and voltage is lag 90 degree in a capacitor.? why Current is lag 90 degree and voltage is lead 90 degree in an inductor.?

1758


During Testing of Maintenance Free Earthing, How deep should be the Spikes of Earth Test Meter should be inserted in the soil(one spike is 15 Meter & Other spike is 30 Mtrs away from the Main Earth Electrode. Because, recently, we observed that when spike is inserted 3-4 Inch in the earth- results are better, If spike is inserted 1 feet deep than results are increasing.

1421


WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE

1545


distribution is maximum done by a)radial b)network c) parallel d)b & c

1471


how many load we can take for lighting

1728






if we run a 3 phase machine on two phase what will happend??? given answer with solid reason please

1575


Advantages/Disadvantages of earthing of neutral bus on MSB instead of separate neutral earthing for transformer/DG sets feeding to MSB

2273


How to do cable earhing? whether by grounding Armour to ground or by running extra G.I wire along with cable? which one is preferred mostly amoung them? If the second one is more preferable how many GI wires to be run along with cable (1 or 2)?

1568


I'm looking for a softcopy manual set for a Credence ASL- 3000. Anyone know where I can get it?

1603


Can you tell me more about pu systems (per unit systems )calculation in large power systems? how to get the base for voltage and power in generator, transformator and transmission lines?

1775


Why negative feedback is preferred in the control system?

828


please suggest some good universities with low cost iam in totally full confusion so please help me my profile gre 283 and ielts 5.5

1155


tell me about roaster switch .& what is the function in transmission & distribution?

2133


Mention the disadvantages of low power factor?

657


the problem faced on star or delta winding connection??

1462