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RELAY 1. REF RELAY : • OPERATION WITH CT CURRENT FLOW DIRECTION. • WHY REF RELAY WHEN DIFFERENTIAL RELAY IS THERE. • REF RELAY STABILITY CHECK BY PRIMARY INJECTION – WHICH POINT FOR CUR RENT INJECTION. • WHY REF RELAY NEED STABILISING RESISTOR. IF RESISTOR SHORTED OR BYPASSED, WHAT WILL HAPPEN. • WHICH TYPE OF RELAY FOR REF, HIGH IMPEDANCE OR LOW IMPEDANCE. • IF NEUTRAL CT IS NOT CONNECTED IN THE CIRCUIT, WHAT WILL HAPPEN. • REF PROTECTION ACTS ON WHICH OF FOLLOWING: SINGLE PH. TO E/F; PH-PH TO E/F; THREE PH. TO E/F. 2. DISTANCE RELAY : • BASIC PRINCIPLE AND TYPES • SWITCHED MODE PROTECTION – WHY IS IT CALLED SO. • SCHEMES USED • WHY ZONE-1 SET AT 80% • SETTING RANGE FOR ZONE-2 AND ZONE-3 • HOW SINGLE PHASE TO GROUND FAULT MEASUREMENT IS DONE. • 3. WHAT IS POLARITY. CT LOCATION IF INTERCHANGED WHAT WILL HAPPEN. 4. SOLKOR RELAY: 1. WHY SOLKOR IS USED. 2. CIRCUIT DIAGRAM OF SOLKOR RELAY 3. DIFFERENT PARTS OF RELAY 4. HOW IT WORKS. 5. EXPLAIN BY VECTOR DIGRAM. 6. WHAT ADVANTAGE FOR USING SUMMATION TR. 7. DIFFERENCE BETWEEN R & RF WITH CIRCUIT. 8. ADJUSTMENT OF PADDING RESISTANCE. 9. WHAT IS LEAKAGE CURRENT AND HOW TO MEASURE. 10. WHAT HAPPEN IF LINK IS LEFT OPEN. 11. 5KV/15KV INSULATION TR. ARE USED IN WHICH SYSTEM. 12. WHAT PRECAUTION TAKEN DURING TESTING. Relay Page 1 of 5 13. PROCEDURE BEFORE TESTING AND AFTER NORMALISATION. 14. HOW RELAY IS TESTED IN LIVE CONDITION. 15. RANGE OF SPILL CURRENT ANS SETTING OF RELAY 16. IF MEASURED CURRENT IS 5MILLI AMPS, CAN RELAY OPERATE. 17. EACH FAULT APPROXIMATE VALUE OF PICK UP. 18. WHAT IS THE REASON SOLKOR-R MODE PILOT SHORTED CONDITION RELAY CURRENT PRESENT. 19. AFTER SHUTDOWN, WHY NEED TO OPEN SOLKOR PILOT, IF NOT WHAT WILL HAPPEN. 20. AFTER NORMALISING WHAT CURRENT TO BE MEASURED, WHAT IS ACCEPTABLE LIMIT. 21. WHAT HAPPENS IF PILOT OPENS FROM RELAY, WHEN FEEDER IS LOADED. 22. CAN WE USE THIS RELAY AS O/C OR E/F RELAY. 23. ANY RELAY OTHER THAN PILOT CABLE TYPE. 24. IF FEEDER TRIPS ON SOLKOR, WHAT TO DO. 25. WHAT HAPPENS IF PILOT POLARITY REVERSE. 26. WHAT HAPPENS WHEN CT SHORTED AT ONE END. 27. WHAT HAPPENS IF PILOT SHORTED – STATUS OF RELAY 28. WHAT HAPPENS TO RELAY ,IF POWER CABLE GETS OPEN. 29. WHAT HAPPEN IF PADDING RESISTOR IS SHORTED AT ONE END. 5. TR. DIFFERENTIAL: 1. CIRCUIT DIAGRAM 2. DIRECTION OF FAULT CURRENT. 3. WHEN THE FAULT IS IN ZONE AND OUT OF ZONE. 4. CT CONNECTION IN PY. AND SY. SIDE. 5. BIAS SETTING AND BIAS CURRENT. 6. WHICH BIAS SETTING USED IN TRS. FOR HIGHER TAPS. 7. PURPOSE OF RESTRAINING BIAS COIL. 8. WHY BIASING REQUIRED. 9. EXPLAIN IPCT, FOR EXAMPLE, DYN10 VECTOR GROUP. WHY MATCHING TR. USED. 10. WHY NEED 2ND HARMONIC BLOCKING DURING INRUSH. 11. WHICH HARMONIC IS MORE 2ND OR 3RD. 12. HOW TO AVOID FALSE TRIPPING IN DIFF. PROTECTION WHEN INRUSH CURRENT FLOW DURING TR. IS ENERGISED. Relay Page2 of5 6. DIRECTIONAL RELAY: 1. CIRCUIT FOR USE OF DIRECTIONAL PROTECTION SYSTEM. 2. WORKING ZONE / NON-WORKING ZONE. 3. HOW THE CORRECT DIRECTION OF FLOW OF CURRENT IS DETERMINED. 4. CT & PT CONNECTION DIAGRAM. 5. SETTING OF PHASE & EARTH FAULT ANGLE AND OPERATING REGION. 6. WHICH DIRECTION IT IS PROTECTING. 7. WHAT PROTECTION AVAILABLE FOR POWER TR. 8. WHY CT CONNECTION IS STAR, IF TR. WINDING IS DELTA. 9. DIFFERENCE BETWEEN REF AND DIFF. RELAY 10. WHERE IS O/C & E/F RELAY CONNECTED EITHER HV SIDE OR LV SIDE AND HOW E/F RELAY WORKS IF TR. WINDING IS DELTA CONNECTED. 11. IN DELTA WINDING OF TR., IF ONE WINDING IS CUT AND NOT EARTHED, WHICH PROTECTION WILL ACT. 12. IF DIFF. & REF RELAY ARE NOT WORKING, WHAT IS BACK UP PROTECTION IN TR. 13. WHAT IS PURPOSE OF NGR AND HOW STANDBY E/F RELAY WORKING, TESTING PRECAUTIONS IF COMMON NGR IS USED. 14. WHAT IS PROTECTIVE ZONE OF STANDBY E/F RELAY. 15. WHAT ARE PROTECTION AVAILABLE FOR FEEDER. 16. AFTER TR. IS NORMALISED, WHAT CURRENT TO BE MEASURED. 17. BUSBAR PROTECTION: a. BASIC PRINCIPLE AND DIAGRAM WITH CURRENT DIRECTION. b. WHY OVER LAPPING CT’S REQUIRED, IF NOT WHAT WILL BE THE EFFECT. c. WHY CT SUPERVISION REQUIRED, HOW TRIPPING IS AVOIDED, WHAT IS CT SUPERVISION SETTING VALUE. d. HIGH IMPEDANCE & LOW IMPEDANCE TYPE e. TEST PROCEDURE(STEP BY STEP) f. AFTER NORMALISING, SPILL CURRENT VALUE AND LIMIT. Relay Page3of5 18. CIRCUIT BREAKER FAILURE – FUNCTION, WHY NEEDED, HOW TRIPPING ARRANGEMENT. 19. WHY INSTANTANEOUS ELEMENT IS NOT USED IN THE NETWORK. 20. WHEN FEEDER IS LIVE AND BY MISTAKE LINE EARTH SWITCH IS CLOSED, WHICH RELAY OPERATES – O/C OR E/F. 21. DURING TR. SWITCHING ON, IF DIFF. RELAY IS BLOCKED BY 2ND HARMONICS, WHAT ARE THE OTHER PROTECTION IN SERVICE. 22. WHICH OF FOLLOWING PROTECTION OPERATES FAST, WHEN 11KV CABLE COMPARTMENT GET FLASH OVER: CABLE DIFFERENTIAL; OVERCURRENT & EARTH FAULT; ARC PROTECTION. 23. WHICH PROTECTION OPERATES WHEN ANY ONE OF THE OHL PHASE IS CUT AND HANGING, NOT TOUCHED WITH EARTH. 24. WHAT ARE DIFFERENT TTB ALARMS – HOW YOU KNOW THERE IS ANY ALARM. 25. WHAT IS CIRCULATING CURRENT AND HOW IT WILL COME. 26. IF ONE TR. TRIPPED ON DIFF. RELAY WHAT YOU WILL DO. 27. IF SUB-STATION TRIP ON BUSBAR PROTECTION, HOW YOU WILL RESTORE. 28. WHAT IS CT SATURATION. HOW IT IS CARRIED OUT. 29. D.C EARTH FAULT – HOW YOU WILL FIND OUT. Relay Page 4 of5 30. PILOT WIRE SUPERVISION – HOW IT WORKS 31. IN 11KV SWITCHGEAR DBB SCHEME, ONE E/F RELAY IS FAULTY IN ONE FEEDER AND THERE IS NO SPARE FEEDER – HOW YOU WILL NORMALISE THE FEEDER. 32. WHICH PROTECTION IS USED FOR LONG CABLE FEEDER 33. DIFFERENCE BETWEEN TRAFO. DIFF. AND CABLE DIFF. PROTECTION. 34. WHAT TYPE CHARACTERISTIC AVAILABLE FOR O/C AND E/F RELAY. 35. WHAT IS THE DIFFERENCE BETWEEN STATIC AND ELECTRO- MECHANICAL O/C RELAYS. 36. WHAT IS DEAD ZONE 37. HOW TRIPPING OF OTHER ZONE AVOIDED WHEN BUS SECTION CB IN OPEN CONDITION FOR DEAD ZONE FAULT. 38. IF OUT OF STEP ALARM COMES WHILE ALL TR. IN SAME TAP POSITION, WHAT YOU WILL DO. 39. WHAT YOU WILL DO IF AN 11KV FEEDER FAILED TO TRIP ON: O/C or E/F or SOLKOR. HOW YOU RESTORE THE SUPPLY. Relay Page 5 of5
2 15861TRAFO 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
2351By just seeing a transmission tower, how can we knew the voltage it carries..?[110kv, 220kv, 400kv...]???
5 8963is there any difference in reading or error in value, if we connect the R phase in Y terminal and Y phase in R terminal of electronic energy meter of 11 kv feerders???
1 4515we all know that both the generator and motor are electromechanical conversion devices.....then why we rate motor in kw and generator in kva????
4 7640Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?
3 6506IN THE CASE OF AN ELCB, IF THERE IS ANY UNSTABILITY BETWEEN PHASE AND NEUTRAL IT MAY TRIP. BUT MY QUESTION IS WHEN A LOAD IS CONNECTED IN BETWEEN P AND N, THE LOAD CONSUMES SOME POWER AND THERE IS A DIFFERENCE IN NEUTRAL WITH RESPECT TO THE PHASE. THUS ACCORDING TO ME, THE ELCB WILL AUTOMATICALLY OPERATES WHEN EVER THE LOAD CONSUMES-- I KNOW IT IS WRONG. BUT THE SOLUTION IS?????????
1 4263phase association of 3PH L&T static CT meter is wrong. means 1PH & 1 CT connected properly and other 2 voltage and CT's inter changed. what would be the impact in the reading?
3 8639Post New KSEB Interview Questions
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PAPER 1--GENERAL APTITUDE Directions:Each question given below consists of a word, followed by four words or phrases. Choose the lettered word or phrase that is most nearly opposite in meaning to the word in the question. ANTONYMS 1. Disregarded (a) heed (b) hopeful (c) evade (d) dense Ans. (a) 2. Obviate (a) becloud (b) necessitate (c) rationalize (d) execute Ans. (b) 3. Superficial (a) profound (b) exaggerated (c) subjective (d) spirited Ans. (a) 4. Abide (a) retract an offer (b) refuse to endure (c) shield from harm (d) exonerate Ans. (b) 5. Acerbity (a) noteworthiness (b) hypocrisy (c) mildness of temperament (d) lack of anxiety Ans. (c) Directions: Each question or group of questions is based on a passage or set of conditions. For each question, select the best answer choice given. Quesitions 6-9 In a certain society, there are two marriage groups, Red and Brown. No marriage is permitted within a group. On marriage, males become part of their wife's group: women remain in their own group. Children belong to the same group as their parents. Widowers and divorced males revert to the group of their birth. Marriage to more than one person at the same time and marriage to a direct descendant are forbidden. 6. A Brown female could have had I. a grandfather born Red II. a grandmother born Red III. two grandfathers born Brown (a) I only (b) II only (c) I and II only (d) II and III only (e) I,II and III Ans. (c) 7. A male born into the Brown group may have (a) an uncle in either group (b) a Brown daughter (c) a Brown son (d) a son-in-law born into the Red group (e) a daughter-in-law in the Red group Ans. (a) 8. Which of the following is not permitted under the rules stated? (a) A Brown male marrying his father's sister (b) A Red female marrying her mother's brother (c) A man born Red, who is now a widower, marrying his brother's widow (d) A widower marrying his wife's sister (e) A widow marrying her divorced daughter's ex-husband Ans. (b) 9. If widowers and divorced males retained the group they had upon marrying, which of the following would have been permissible?(Assume no previous marriages occurred) (a) A woman marrying her dead sister's husband (b) A woman marrying her divorced daughter's ex-husband. (c) A widower marrying his brother's daughter (d) A woman marrying her mother's brother, who is a widower (e) A divorced male marrying his ex-wife's divorced sister Ans. (d) Questions 10-13 Tom wishes to enroll in Latin AA, Sanskrit A, Armenian Literature 221, and Celtic Literature 701. Latin AA meets five days a week, either from 9 to 11 A.M or from 2 to 4 P.M. Sanskrit A meets either Tuesday and Thursday from 12 noon to 3 P.M., or Monday, Wednesday, and Friday from 10 A.M to 12 noon. Armenian Literature 221 meets either Monday, Wednesday, and Friday from 12:30 to 2 P.M., or Tuesday and Thursday from 10:30 A.M to 12:30 P.M Celtic Literature 701 meets by arrangement with the instructor, the only requirement being that it meet for one four-hour session or two two-hour sessions per week, between 9A.M and 4 P.M from Monday to Friday, beginning on the hour. 10. Which combination is impossible for Tom? (a) Latin in the morning, Sanskrit on Tuesday and Thursday, and Armenian Literature on Monday, Wednesday, Friday (b) Latin in the afternoon and Sanskrit and Armenian Literature on Monday, Wednesday, and Friday. (c) Latin in the afternoon, Sanskrit on Monday, Wednesday, and Friday,and Armenian Literature on Tuesday and Thursday (d) Latin in the morning and Sanskrit and Armenian Literature on Monday, Wednesday, and Friday (e) Latin in the afternoon, Armenian Literature on Monday, Wednesda and Friday, and Celtic Literature on Tuesday Ans. (d) 11. Which of the following gives the greatest number of alternatives for scheduling Celtic Literature, assuming that all other courses (a) Latin in the afternoon and Armenian Literature Monday, Wednesday and Friday (b) Sanskrit on Tuesday and Thursday and Armenian Literature on Monday, Wednesday and Friday (c) Latin in the afternoon and Armenian Literature Tuesday and Thursday (d) Latin in the morning and Sanskrit on Tuesday and Thursday (e) Sanskrit on Monday, Wednesday, and Friday. and Armenian Literature on Tuesday and Thursday Ans. (a) 12. If the Celtic instructor insists on holding at least one session on Friday, in which of the following can Tom enroll? (I) Armenian Literature on Monday, Wednesday, and Friday (II) Sanskrit on Monday, Wednesday, and Friday (a) I only (b) II only (c) both I and II (d) I or II but not both (e) neither I nor II Ans. (d) 13. Which of the following additional courses, meeting as indicated, can Tom take? (a) Maths--Monday, Wednesday, and Friday from 10A.M to 12 noon (b) French--Monday, Wednesday, and Friday from 11A.M to 12:30 P.M (c) English--Tuesday and Thursday from 2 to 4 P.M (d) Japenese--Tuesday and Thursday from 1 to 3 P.M (e) Old Norse-Icelandic--Monday only from 12 to 3 P.M Ans. (b) Questions 14-18 (1) Ashland is north of East Liverpool and west of Coshocton (2) Bowling Green is north of Ashland and west of Fredericktown (3) Dover is south and east of Ashland (4) East Liverpool is north of Fredricktown and east of Dover (5) Fredricktown is north of Dover and west of Ashland (6) Coshocton is south of Fredricktown and west of Dover 14. Which of the towns mentioned is furthest to the northwest ? (a) Ashland (b) Bowling Green (c) Coshocton (d) East Liverpool (e) Fredericktown Ans. (b) 15. Which of the following must be both north and east of Fredricktown? (I) Ashland (II) Coshocton (III) East Liverpool (a) I only (b) II only (c) III only (d) I and II (e) I and III Ans. (e) 16. Which of the following towns must be situated both south and west of at least one other town? (a) Ashland only (b) Ashland and Fredricktown (c) Dover and Fredricktown (d) Dover,Coshocton and Fredricktown (e) Dover,Coshocton and East Liverpool Ans. (d) 17. Which of the following statements, if true, would make the information in the numbered statements more specific? (a) Coshocton is north of Dover (b) East Liverpool is north of Dover (c) Ashland is east of Bowling Green (d) Coshocton is east of Fredericktown (e) Bowling Green is north of Fredericktown Ans. (a) 18. Which of the numbered statements gives information that can be deduced from one or more of the other statement? (a) (1) (b) (2) (c) (3) (d) (4) (e) (6) Ans. (c) Questions 19-22 Spelunkers International offers exploring tours in eight caves: Abbott, Benny, Caeser, Dangerfield, Ewell, Fields, Guinness, and Hope (1) Class 1 spelunkers may not attempt cave Ewell, Fields or Hope (2) Class 2 spelunkers may not attempt Hope (3) Class 3 spelunkers may attempt any cave (4) Cave Caesar may be attempted only by spelunkers who have previously explored cave Benny (5) Cave Fields may be attempted only by spelunkers who have previously explored cave Ewell (6) Only two of caves Benny, Caeser, Ewell, Fields, and Hope may be attempted by any explorer in a single tour 19. A class 2 spelunker who has previously explored cave Ewell may be restricted in choosing a tour by which rule(s)? (I) Rule(4) (II) Rule(5) (III) Rule(6) (a) I only (b) II only (c) I and III only (d) II and III only (e) I, II and III Ans. (c) 20. In how many different ways may a class 1 spelunker who has never explored any of the eightcaves before set up a tour of three caves, if she wishes to explore caves Abbott and Caesar? (a) 2 (b) 3 (c) 4 (d) 5 (e) 6 Ans. (b) 21. What is the maximum number of caves that a class 3 spelunker who has previously explored only cave Benny may include in a single tour? (a) 4 (b) 5 (c) 6 (d) 7 (e) 8 Ans. (b) 22. If x + y = 3 and y/x= 2 then y = ? (a) 0 (b) 1/2 (c) 1 (d) 3/2 (e) 2 Ans. (e) 23. How many squares with sides 1/2 inch long are needed to cover a rectangle that is 4 ft long and 6 ft wide (a) 24 (b) 96 (c) 3456 (d) 13824 (e) 14266 24. If a=2/3b , b=2/3c, and c=2/3d what part of d is b/ (a) 8/27 (b) 4/9 (c) 2/3 (d) 75% (e) 4/3 Ans. (b) 25. Successive discounts of 20% and 15% are equal to a single discount of (a) 30% (b) 32% (c) 34% (d) 35% (e) 36 Ans. (b) 26. The petrol tank of an automobile can hold g liters.If a liters was removed when the tank was full, what part of the full tank was removed? (a)g-a (b)g/a (c) a/g (d) (g-a)/a (e) (g-a)/g Ans. (c) 27.If x/y=4 and y is not '0' what % of x is 2x-y (a)150% (b)175% (c)200% (d)250% Ans. (b) 28.If 2x-y=4 then 6x-3y=? (a)15 (b)12 (c)18 (d)10 Ans. (b) 29.If x=y=2z and xyz=256 then what is the value of x? (a)12 (b)8 (c)16 (d)6 Ans. (b) 30. (1/10)18 - (1/10)20 = ? (a) 99/1020 (b) 99/10 (c) 0.9 (d) none of these Ans. (a) 31. Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the time taken to fill the tank (a) 17 1/7 mins (b) 20 mins (c) 8 mins (d) none of these Ans. (a) 32. Thirty men take 20 days to complete a job working 9 hours a day.How many hour a day should 40 men work to complete the job? (a) 8 hrs (b) 7 1/2 hrs (c) 7 hrs (d) 9 hrs Ans. (b) 33. Find the smallest number in a GP whose sum is 38 and product 1728 (a) 12 (b) 20 (c) 8 (d) none of these Ans. (c) 34. A boat travels 20 kms upstream in 6 hrs and 18 kms downstream in 4 hrs.Find the speed of the boat in still water and the speed of the water current? (a) 1/2 kmph (b) 7/12 kmph (c) 5 kmph (d) none of these Ans. (b) 35. A goat is tied to one corner of a square plot of side 12m by a rope 7m long.Find the area it can graze? (a) 38.5 sq.m (b) 155 sq.m (c) 144 sq.m (d) 19.25 sq.m Ans. (a)
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