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Electrical Engineering Interview Questions
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Hi to all... I Want Weight Details of the alternator for making free power energy.

ME,

1144

How we can differniate the overhead lines feeded by hydro power stations & thermal power stations

1 2135

We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 4376

1.main parts of generator? what is used A-check,B-check,C- check? 2.what is FM200 system in data centers? 3.difference between pac,ahu?

TATA,

1188

What is the real use of reactive power in a electrical system other than loss (inductive &capacitive).I want to know its real physical significance.

908

how to find the starting current of the motor?

BOC,

1 1342

what are the problems faiced at dg comissiong

Aster Teleservices,

1293

what are the different types of bus bar used at electrical work at shelter

Aster Teleservices, Costco,

3 5941

What happen to the transformer if the OLTC frequently used for lower and raise occured 50times daily?

1064

what is the purpose of the armored for the power Or control cable? How to select the type of the armored?

Siemens,

1 3066


can a generator with 15AH specified battery for starting can be connected to a battery of greater capacity?

2 2157

Differnce between Analog & Digital

1 3039

Any body can help me in getting LT panel test procedure.

TATA,

1079

Please tell me what is the difference between online UPS & OFF line UPS?

HAL,

2 4057


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Un-Answered Questions { Electrical Engineering }

What is the ratio of true power to apparent power in an ac circuit?

161


does buccholz in a transformer use batteries

2771


why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?

1268


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

1507


List out the different frequency domain specifications?

167






How can we calculate strength of copper hich is supplying electric power to heater and in it hold the heater also and what r all types of forces which is acting on it...

1012


which is the best institute for PLC,SCADA,DCS in hyderabad

1378


what is transient enclosure vltage , very fast transients, very fast transient over voltages

1117


Why the moulded plug comes with domestic appliances instead of assembled plug like anchor, Vinay 5/15 A.

1103


How many types oil using in transformer ? How many letars using in transformer..?

1079


defination of lines

1116


please explain how to do 'pole drop test' on generator?

1843


PLEASE SEND ME NTPC RELATED INFORMATION LIKE WHICH TOPICS HAV MORE SCOPE,BOOKS TO READ,CUT OFF...PLEASE.mail at thiru.1203@gmail.com

1181


stand by earth fault protection (51G) for transformer rating 2000 kVA,Dyn11,33/0.400 V. LV NCT ratio and necessary resistor and metrosil values how to calculate

1239


i have seen one 8.4 MW synchronous motor in a plant located in bellary it is fixed with brushless rotary rectifier ,anybody can explain its start up principle

1043