Transmission

Multiple Choice Questions Related with Transmission.

 

#1. In india, adopted for transmission of electric power is….?

#2. The higher the transmission voltage,….is the conductor material required?

#3. The higher the transmission voltage,….is the conductor material required?

#4. The economic size of conductor is determined by….?

#5. If voltage is increased by ‘n’ times, the size of the conductor would…?

incorrect

#6. A wire placed on the top of a transmission line acts as….?

#7. The highest transmission ac voltage in india is….?

#8. In a transmission system, the cost of conductor propotional to ……of conductor?

#9. In a transmission system, the cost of conductor propotional to ……of conductor?

#10. The primary distribution is done by….?

#11. Which of the following is not the advantage of high transmission voltage?

#12. If supply freaquency increase, the skin effect is…..?

#13. The material commonly used for sheaths of underground cable is….?

#14. To meet the reactive power requirements at load centres usually….?

#15. Skin effect exist only in….?

#16. 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

#17. The conductivity of aluminium is …..% of copper?

#18. Weight of the aluminium ….. weight of equivalent copper conductor?

incorrect

because specific gravity of aluminium is lower than that of copper

#19. Aluminium conductor produce greater sag because of…..?

#20. Cross arms are used on poles to provide ….to the insulators?

#21. The most commonly used insulator material for transmission line?

#22. Inorder to increase tensile strength, the aluminium conductor is reinforced with a core of galvanised ……wires?

#23. Pin type insulators are used for voltage beyond…..?

#24. Saftey factor of indulator =……

#25. Pin type insulator showing the value of saftey factor is about….?

#26. If the spacing between the conductors is increased, then corona effectis…..?

#27. 1

#28. 2

#29. 4

#30. 5

#31. 7

#32. 3

#33. 6

#34. 8

#35. 9

#36. 10

#37. The insulator is so designed that it should fail only by…..?

#38. The potential across the various discs of suspension string is different because of…….capacitance?

#39. The power loss in an over head transmission line is mainly due to…..?

#40. Length of the transmission line increases, its inductance will be….?

#41. If the power factor of the load decreases, the line losses…..?

#42. In single core cables armouring is not done inorder to avoid…..?

#43. The line constants of a transmission line are……?

#44. The length of short transmission line is upto about…..?

#45. When the regulation is positive, then recieving end voltage is ….. than sending end voltage?

#46. Voltage of low tension cables is upto…..?

#47. Which of the following insulator used at the dead end of the transmission line….?

#48. 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…..?

#49. 1

#50. 2

#51. 4

#52. 5

not depend height

#53. In low voltage transmission line, corner or sharp curve edges used which type insulator?

#54. The tendency of ac to concentrate near the surface of conductor called?

#55. The phenomenon of violet glow, hissing noise and production of ozone gas in an overhead transmission line called?

#56. The phenomenon of violet glow, hissing noise and production of ozone gas in an overhead transmission line called?

#57. Which of the following is not effect the skin effect of conductor?

#58. If the string efficiency is 100%, means…..?

#59. If shunt capacitance is reduced, then string efficiency is…..?

incorect

capacitance reduced by increase spacing

#60. If sag in an over head line increases, tension in the line…..?

#61. The discs of the strain insulators are used in which plane?

#62. Which of the following not a method of reducing corona formation?

#63. If the spacing between the conductors is increased, the inductance of the line….?

#64. 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….?

#65. 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….?

#66. 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

#67. The voltage of high tension cables upto….?

#68. Belted cables used upto….?

screened cable use 22 to 66kv

#69. If the length of cable increases, its insulation resistance …..?

#70. The minimum dielectric stresses in a cable is at….?

incorrect

maximum at conductor surface

#71. Voltage less than 66kV, a 3 phase cable used…..?

incorrect

beyond 66 use 3 single core

#72. In an insulated cable having core diameter d and overall diameter D, the ratio of maximum to minimum dielectric stress is given by….?

#73. Bundled conductor inEHV transmission system provide…..?

#74. Power distribution by cable is generally adopted for length …..?

#75. If the length of a cable is doubled, its capacitance is…..?

#76. The process of acheiving uniform electrostatic stress in the dielectric of cables is known as…..?

#77. For the same safe potential, the size of a graded cable will be…..than that of ungraded cable?

#78. For operating voltage beyond 66kv, which of the following cable is used?

#79. Voids in the layers of impregnated paper insulation ……the break down voltage of cables?

#80. The voltage of extra super tension cable is beyond…..?

#81. Which connection is best suited for 3 phase 4 wire service?

#82. Dielectric strength of air in KV/mm?

#83. The effective resistance ….. due to skin effect?

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