Multiple Choice Questions Related with Transmission.
#2. The higher the transmission voltage,….is the conductor material required?
#3. The economic size of conductor is determined by….?
#4. If voltage is increased by ‘n’ times, the size of the conductor would…?
incorrect
#5. A wire placed on the top of a transmission line acts as….?
#6. The highest transmission ac voltage in india is….?
#7. In a transmission system, the cost of conductor propotional to ……of conductor?
#8. The primary distribution is done by….?
#9. Which of the following is not the advantage of high transmission voltage?
#10. If supply freaquency increase, the skin effect is…..?
#11. The material commonly used for sheaths of underground cable is….?
#12. To meet the reactive power requirements at load centres usually….?
#13. Skin effect exist only in….?
#14. Which of the following is not a property of conducting material used for transmission of electric power?
incorrect
low specific gravity material used because weight per unit volume is small
#15. The conductivity of aluminium is …..% of copper?
#16. Weight of the aluminium ….. weight of equivalent copper conductor?
incorrect
because specific gravity of aluminium is lower than that of copper
#17. Aluminium conductor produce greater sag because of…..?
#18. Cross arms are used on poles to provide ….to the insulators?
#19. The most commonly used insulator material for transmission line?
#20. Inorder to increase tensile strength, the aluminium conductor is reinforced with a core of galvanised ……wires?
#21. Pin type insulators are used for voltage beyond…..?
#22. Saftey factor of indulator =……
#23. Pin type insulator showing the value of saftey factor is about….?
#24. If the spacing between the conductors is increased, then corona effectis…..?
#25. The insulator is so designed that it should fail only by…..?
#26. The potential across the various discs of suspension string is different because of…….capacitance?
#27. The power loss in an over head transmission line is mainly due to…..?
#28. Length of the transmission line increases, its inductance will be….?
#29. If the power factor of the load decreases, the line losses…..?
#30. In single core cables armouring is not done inorder to avoid…..?
#31. The line constants of a transmission line are……?
#32. The length of short transmission line is upto about…..?
#33. When the regulation is positive, then recieving end voltage is ….. than sending end voltage?
#34. Voltage of low tension cables is upto…..?
#35. Which of the following insulator used at the dead end of the transmission line….?
#36. The ratio of voltage across the whole string to the product of number of discs and the voltage across the disc nearest to the conductor is known as…..?
#37. In low voltage transmission line, corner or sharp curve edges used which type insulator?
#38. The tendency of ac to concentrate near the surface of conductor called?
#39. The phenomenon of violet glow, hissing noise and production of ozone gas in an overhead transmission line called?
#40. The phenomenon of violet glow, hissing noise and production of ozone gas in an overhead transmission line called?
#41. Which of the following is not effect the skin effect of conductor?
#42. If the string efficiency is 100%, means…..?
#43. If shunt capacitance is reduced, then string efficiency is…..?
incorect
capacitance reduced by increase spacing
#44. If sag in an over head line increases, tension in the line…..?
#45. The discs of the strain insulators are used in which plane?
#46. Which of the following not a method of reducing corona formation?
#47. If the spacing between the conductors is increased, the inductance of the line….?
#48. The capacitance measured between any two cores of a 3 core cable with the sheath earthed is 3 micro farad. the capacitance per phase will be….?
#49. The capacitance measured between any two cores of a 3 core cable with the sheath earthed is 3 micro farad. the capacitance per phase will be….?
#50. If the insulation resistance of 2m long sample of a cable is 10Mohm. then a 8 m long sample of the same will have an insulation resistance of….?
R2l2=R1l1
=R2=l1R1/l2=2×10/8=2.5
#51. The voltage of high tension cables upto….?
#52. Belted cables used upto….?
screened cable use 22 to 66kv
#53. If the length of cable increases, its insulation resistance …..?
#54. The minimum dielectric stresses in a cable is at….?
incorrect
maximum at conductor surface
#55. Voltage less than 66kV, a 3 phase cable used…..?
incorrect
beyond 66 use 3 single core
#56. In an insulated cable having core diameter d and overall diameter D, the ratio of maximum to minimum dielectric stress is given by….?
#57. Bundled conductor inEHV transmission system provide…..?
#58. Power distribution by cable is generally adopted for length …..?
#59. If the length of a cable is doubled, its capacitance is…..?
#60. The process of acheiving uniform electrostatic stress in the dielectric of cables is known as…..?
#61. For the same safe potential, the size of a graded cable will be…..than that of ungraded cable?
#62. For operating voltage beyond 66kv, which of the following cable is used?
#63. Voids in the layers of impregnated paper insulation ……the break down voltage of cables?
#64. The voltage of extra super tension cable is beyond…..?
#65. Which connection is best suited for 3 phase 4 wire service?
#66. Dielectric strength of air in KV/mm?
#67. The effective resistance ….. due to skin effect?
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