OBJECTIVE –QUESTIONS ON TRD (PART - 8 )
451. In a TSS, concrete wall between both the transformers is known as Baffel –Wall. (true/false).
452. Transformer oil is a mineral-oil used as fuel .( true/false)
453. Synthetic oils can also be used as Transformer –Oil.(true/false)
454. Sampling of transformer oil should be done in dry, hot and clear atmosphere. (true/false)
455. PRD is used to protect the transformer from high internal pressure.(true/false)
456. Drain Cork is used to protect the transformer from high internal pressure.(true/false)
457. In context of transformer, copper loss means wear & tear of winding. (true/false)
458. In context of transformer, Iron-loss means wear & tear of Core. (true/false)
459. Step-up transformer increases voltage. (true/false)
460. Step-down transformer reduces electrical power. (true /false)
461. Transformer is a device which bridges high and low voltage circuits. (true/fase)
462. Periodicity of POH of Power transformer is 4 years. (true/false)
463. New transformer oil is clear and transparent in colour. ( true/ false) 464. Out put voltage of a transformer can be controlled by tap-changer. ( true/false)
465. There is no relation between turn ratio and voltage ratio of a transformer.(true/false) 466. Transformers may also be classified on number of phases. (true/fase)
467. In case of Auto transformer, both the primary and secondary terminals are connected with the same winding.(true/false)
468. A transformer works only in one direction that is , imposing voltage to primary voltage appears on secondary terminals but imposing voltage to secondary no voltage appears on primary terminals. (true/false)
469. Transformer work in both directions, i.e. primary to secondary and vice-versa. (true/false)
470. If an ONAN transformer is turned to ONAF, its capacity improves. (true/false)
471. Normally HT bushing is oil filled type. (true/false)
472. HT bushing is always shield type. (true/false)
473. On BDV test, if the results are less than the standard one, oil filtration should be done. (true/false)
474. It indicates some thing abnormal if there is considerable rise in readings of OTI/WTI from that of last readings. (true/false)
475. That actions are not required during the half yearly maintenance which are done in monthly maintenance.( true/false)
476. Before meggering it is compulsory to make the bushing free from dust and moisture. (true /false)
477. In case of single phase traction transformer, it is not compulsory to open terminal connections prior to meggering of the transformer. ( true/false)
478. Tan –δ test indicates the quality of the insulating material. (true/false)
479. For transformer bushing, value of tan-δ should not be less than 0.007. (true/false)
480. Capacitance value for transformer bushing should not be less than 110% of factory set value.(true/false)
481. CB controls the supply of ---------------.( Sector, Sub-Sector,Elementry Section)
482. BM controls the supply of ---------------.( Sector, Sub-Sector,Elementry Section)
483. Isolator controls the supply of -----------.( Sector, Sub-Sector,Elementry Section)
484. On faults---------------------- trips automatically. (CB, BM, OHE, PT-II)
485. OFF load hand operated switch is well known as ---------- (CB,BM, MCB,Isolator) 486. What is not controlled by TPC through remote control? (CB, BM, DPI)
487. What is common among TPI, DPI, SPI and BPI? a) A CB is connected to all of them. b) All of them is used for transformer isolation. c) All are located in a FP. d) Each of them is a type of isolator.
488. When 25KV isolator is in opened condition, what should be the clearance between its fixed and moving contact?
489. Code ----------- is prefixed before number of isolator connected with main line OHE.
490. Out of the following, what is not there in the pole unit of CB/BM? a) Fix and Moving Contact. b) Arc quenching medium. c) Main and Arcing Contact. d) Auxiliary contact.
491. Out of the following, what is not the type operating mechanism of a CB or BM? a) Air open/ Air Close b) Spring open / spring close c) Air open / spring close. d) ONAN / ONAF
492. What is not compulsory for maintenance of CB / BM? a) To obtain PTW from TPC. b) To open SPI/DPI from both sides. c) To keep switch gear on local control. d) To keep 110 volt DC supply switched off during the work. e) Non of the above.
493. Normally gas pressure in SF6 type CB/BM is maintained at --------------.
494. Low gas pressure alarm operates at ----------- kg/cm² for SF6 CB/BM ,where normal gas pressure is 5 Kg/cm²
495. SF6 CB/BM(5Kg/cm²) locks-out at low gas pressure of ----------------- kg/cm².
496. Which component of SF6 CB/BM generates low gas pressure alarm/lock-out signals?
497. Function of Gas Density switch is – a) to check purity of SF6 gas. b) to control total break time . c) to generate signal according to gas pressure in pole unit.
452. Transformer oil is a mineral-oil used as fuel .( true/false)
453. Synthetic oils can also be used as Transformer –Oil.(true/false)
454. Sampling of transformer oil should be done in dry, hot and clear atmosphere. (true/false)
455. PRD is used to protect the transformer from high internal pressure.(true/false)
456. Drain Cork is used to protect the transformer from high internal pressure.(true/false)
457. In context of transformer, copper loss means wear & tear of winding. (true/false)
458. In context of transformer, Iron-loss means wear & tear of Core. (true/false)
459. Step-up transformer increases voltage. (true/false)
460. Step-down transformer reduces electrical power. (true /false)
461. Transformer is a device which bridges high and low voltage circuits. (true/fase)
462. Periodicity of POH of Power transformer is 4 years. (true/false)
463. New transformer oil is clear and transparent in colour. ( true/ false) 464. Out put voltage of a transformer can be controlled by tap-changer. ( true/false)
465. There is no relation between turn ratio and voltage ratio of a transformer.(true/false) 466. Transformers may also be classified on number of phases. (true/fase)
467. In case of Auto transformer, both the primary and secondary terminals are connected with the same winding.(true/false)
468. A transformer works only in one direction that is , imposing voltage to primary voltage appears on secondary terminals but imposing voltage to secondary no voltage appears on primary terminals. (true/false)
469. Transformer work in both directions, i.e. primary to secondary and vice-versa. (true/false)
470. If an ONAN transformer is turned to ONAF, its capacity improves. (true/false)
471. Normally HT bushing is oil filled type. (true/false)
472. HT bushing is always shield type. (true/false)
473. On BDV test, if the results are less than the standard one, oil filtration should be done. (true/false)
474. It indicates some thing abnormal if there is considerable rise in readings of OTI/WTI from that of last readings. (true/false)
475. That actions are not required during the half yearly maintenance which are done in monthly maintenance.( true/false)
476. Before meggering it is compulsory to make the bushing free from dust and moisture. (true /false)
477. In case of single phase traction transformer, it is not compulsory to open terminal connections prior to meggering of the transformer. ( true/false)
478. Tan –δ test indicates the quality of the insulating material. (true/false)
479. For transformer bushing, value of tan-δ should not be less than 0.007. (true/false)
480. Capacitance value for transformer bushing should not be less than 110% of factory set value.(true/false)
481. CB controls the supply of ---------------.( Sector, Sub-Sector,Elementry Section)
482. BM controls the supply of ---------------.( Sector, Sub-Sector,Elementry Section)
483. Isolator controls the supply of -----------.( Sector, Sub-Sector,Elementry Section)
484. On faults---------------------- trips automatically. (CB, BM, OHE, PT-II)
485. OFF load hand operated switch is well known as ---------- (CB,BM, MCB,Isolator) 486. What is not controlled by TPC through remote control? (CB, BM, DPI)
487. What is common among TPI, DPI, SPI and BPI? a) A CB is connected to all of them. b) All of them is used for transformer isolation. c) All are located in a FP. d) Each of them is a type of isolator.
488. When 25KV isolator is in opened condition, what should be the clearance between its fixed and moving contact?
489. Code ----------- is prefixed before number of isolator connected with main line OHE.
490. Out of the following, what is not there in the pole unit of CB/BM? a) Fix and Moving Contact. b) Arc quenching medium. c) Main and Arcing Contact. d) Auxiliary contact.
491. Out of the following, what is not the type operating mechanism of a CB or BM? a) Air open/ Air Close b) Spring open / spring close c) Air open / spring close. d) ONAN / ONAF
492. What is not compulsory for maintenance of CB / BM? a) To obtain PTW from TPC. b) To open SPI/DPI from both sides. c) To keep switch gear on local control. d) To keep 110 volt DC supply switched off during the work. e) Non of the above.
493. Normally gas pressure in SF6 type CB/BM is maintained at --------------.
494. Low gas pressure alarm operates at ----------- kg/cm² for SF6 CB/BM ,where normal gas pressure is 5 Kg/cm²
495. SF6 CB/BM(5Kg/cm²) locks-out at low gas pressure of ----------------- kg/cm².
496. Which component of SF6 CB/BM generates low gas pressure alarm/lock-out signals?
497. Function of Gas Density switch is – a) to check purity of SF6 gas. b) to control total break time . c) to generate signal according to gas pressure in pole unit.
498. -------------- is used to check gas pressure in pole-unit. (Gas density switch, Gas pressure gauge, Compressor)
499. Normal working air pressure for 25KV CB/BM is --------------------------.
499. Normal working air pressure for 25KV CB/BM is --------------------------.
500. Air pressure alarm, for 25KV CB/BM, operates at -------------------------.
ANSWER – OBJECTIVE QUESTION ON TRD
451. True 452. False 453. True 454. true 455. True 456. False 457. False 458. False 459. True 460. False 461. True 462. False 463. True 464. True 465. False 466. True 467. True 468. False 469. True 470. True 471. True 472. False 473. True 474. True 475. False 476. True 477. False 478. True 479. False 480. False 481. Sector 482. Sub-Sector 483. Elementry section 484. CB 485. Isolator 486. DPI 487. d 488. 500mm 489. SM 490. d 491. d 492. e 493. 5.5 Kg/cm² 494. 4.5 Kg/cm² 495. 4.0 Kg/cm² 496. Gas Density switch 497. c 498. Gas Density switch 499. 15 Kg/cm² 500. 13 Kg/cm²
