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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is the difference between earth, neutral and ground?

Farnek, Shyam Indus Power, Spiro Solutions,

1 1790

During the main stator winding insulation testing (phase to ground)of 11kv alternator (Lerysomer) i found 0 and resistance with multimeter and found 20 killo ohm while the power cables are connected both end (Generator & VCB). In VCB PT (Potential transformer) are connected. Please any body explain that method of insulation is correct or not? also describe of PT connections

Private,

1 1322

3.7 kw motor ,how much sq mm cabel want to bare this motor load

1 1389

What is PLL? what are it's advantages?

BREB,

1 1142

what will be the breaking capacity of MCCB of 1000kVA (6% Impedence) transformer? Voltage being 415V, Power Factor 0.8.

BPC,

2 1185

Thumb rule of cable size(rm>30 rm)X multiplying factor=ampere

Kazi Farms, SKI Carbon Black,

713

what are balanced and unbalanced loads

GGH,

1 1179

1. What are the types of Transformer?

Valdel,

1 961

On what basis do you decide the ONAN (Oil Natural air natural) or Dry type transformer for a project?

Semac,

605

Which are the types of breakers used in High Tension (HT) side?

1 1641

How to calculate the no of Ceiling fan (1200mm sweep) per unit area?

818

No load tap changing transformer working

745

can the measured percentage error during calibration of single phase energy meter be negative?

1159

I want to merge a cable..in between two metering Cubicals which contains CT's and PT's and Energy meter..before taking merger..what are the common things required?

695

how a generating station can monitor its multi users power factor. What type of incentive /penalty is associated with power factor management.

Sojex,

1 938


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Un-Answered Questions { Electrical Engineering }

how can I calculate charging current of cable/overhead conductor? what is roll of voltage in it ?

2748


Factory acceptance test. FAT. For 132 kv transmisstion towers what is that meaning and what are the tests commonly companies perform now days.

676


1.why should we connect the measuring instruments in l.v side in short circuit test of a transformer? 2.why the power factor is less in open circuit test of a transformer?

1142


how to calculate the earth fault current

1456


TRAFO 1. WHY BREATHER IS USED. 2. WHY OIL GOES DOWN IN CONSERVATOR TANK. 3. WHY WE ARE TAKING OIL SAMPLE TAKING FROM BOTTOM OF TRANSFORMER. 4. HOW TO CHECK IR VALUE OF TRANSFORMER. 5. WHY OLTC HAVING BUCHHOLZ TRIP ONLY; WHY NO ALARM. 6. OFF LOAD TAP CHANGER OPERATION PROCEDURE. 7. TR. SHUTDOWN / ISOLATION PROCEDURE. 8. WHEN THREE TRS. IN PARALLEL, ONE TR. IS NOT SHARING THE LOAD – WHAT IS REASON AND WHAT YOU WILL DO. 9. WHY TR. HAS OLTC IN HV SIDE. 10. WHAT IS % IMPEDANCE. 11. WHY TR. RATING IN MVA. 12. WHAT IS VECTOR GROUP IN TR. 13. CONDITION FOR PARALLEL OPERATION OF TRS. 14. WHAT IS TERTIARY WINDING. WHERE IT WILL BE. 15. IF TR. TRIP ON BUCHHOLZ OR TAP CHANGER RELAY, WHAT YOU WILL DO. 16. DIFFERENCE BETWEEN OIL TEMP. AND WINDING TEMP. PROTECTION 17. HOW WINDING TEMP. IS MEASURED IN CAST RESIN TR. 18. DIFFERENT TYPES OF FAULTS IN TR. Trafo - Page-1 of 2 19. WHAT HAPPENS WHEN TR. CHARGED FROM LV. 20. WHAT WILL YOU DO IF MEGGER READING SHOWS ZERO BETWEEN LV WINDING AND EARTH. 21. CAN WE INTERCHANGE BUCHHOLZ RELAY OF MAIN TANK AND OLTC TANK. 22. IF THE LINE BETWEEN BREATHER AND CONSERVATOR TANK 23. LOCKED, WHAT WILL HAPPEN DURING LOAD CYCLE. 24. WHAT IS THE FUNCTION OF OIL SEAL IN BREATHER. 25. WHAT ARE LOCATIONS FOR BUCHHOLZ RELAY FIXED IN POWER TR. 26. WHAT ARE CHECKS IN POWER TR. DURING MAINTENANCE. 27. WHAT IS IMPORTANT WHEN WE CHECK OLTC OPERATION DURING MAINTENANCE. Trafo - Page 2 of 2

1506






What is knee point voltage?

173


why does a dc machine has high efficiency while working as a generator than as a motor ..

1027


In India the supply voltage is 230 volt A.C. During the negative half cycle phase becomes neutral and neutral become phase? or what will happen during negative half cycle? how the electrons flow during positive and negative half cycle?

1023


gas turbine genrator reactances

977


how to check avr of dg set of 125kva

1587


Where should the lighting arrestor be placed in distribution lines?

171


What are reasond for high wattage in single phase induction motors

778


What happens if the Capacitive Voltage Transformer Primary neutral is not earthed. There is a CVT between Transformer and source, and the CVT neutral of the transformer is not earthed, does it effect the transformer while charging or does it effect the transformer charging process.

2763


Why phase sequence must be same in any ht motor or generator circuit?if phase sequence doesn't same whatever will be affect on circuit?

1234


In 11/0.414 KV Parralel supply network with Bus tie closed what will be the fault level is it doubled or halved??

1136