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Electrical Engineering Interview Questions
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Is there a possibility to use such a treshold voltage for the NMOS part of a CMOS circuit that during the switching it will start conducting only after the PMOS part will be already closed, by this eliminating the leakedge current? Please note, I'm not asking about the well bias in standby mode, but about the "antileakedge" measures during normal operation.

1006

what is the length of air terminal in lightening arrester system.

1 3211

if v r considering a 4000/1A ct,if v inject 1 amps in secondary core wat happens?(consider as 2 core ct,each for metering and protection)

1 2034

how will you determine the short circuit capacity of a network

Dalkia,

3 6478

In a three phase transformer(delta/star connected)when i touch one end of the bulb in any one phase and other end to earth..will the bulb glow or not..if not why?..i'm touching the bulb in star connected side...

6 5733

importance of air gap in transformer

5 8471

How to select the cable size for the given load ?Pls explain the Formulae

3 5752

if two bulb of 50w &30w apply in series having 230v the which bulb glow bright ,why

10 14617

two generator runnig with parallel but only one NGR on And one off Why

1 4588

what is earth-fault?when it occurs? to check where it occurs what type of test should we do?

ONGC,

1151

how tan-delta test is performed?

GE, VDL,

1 5247

why transmission voltages are in multiple of 11kv?

10 21245

what is gridrotor resistance starter

969

what is the switching substation

2 4888

tell how current tranfomer works

2 3210


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Un-Answered Questions { Electrical Engineering }

which pump used in WTP explain the function of VFD how to dtermine capacitorbank of capacity one plant

992


Atwhat condition reverse power relay will act?

1147


What are the types of transformers according to the arrangement of iron cores?

173


What are all present producing cost of Per KWH of various Fuel?

1604


How to select the cable and voltage drop in circuit?

674






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


How can we measure earthing resistance test (Earth meggar) of Transformer neutral pit while in live condition?.

1101


Why a Permanent Magnet Generator has higher frequency as compared to frequency of main alternator?

964


Why different Pressure switch used in marine boiler water circulation system

818


What current position are you holding in your current company?

1138


A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

2841


What is cross over distortion? How it can be eliminated?

212


How does a digital electronic meter work??????

1138


in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?

1171


Explain the operation carried out in thermal power stations?

165