Multiple Choice Questions Related with Transmission.
#2. The higher the transmission voltage,....is the conductor material required?
#3. Suspension type insulator used for voltage beyond value of...?
#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. The greater the power to be transmitted ,.....is the transmission voltage? ?
#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 upto.....?
#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. The tendency of alternating current to concentrate near the surface of a conductor is called....?
#28. A mettalic sheath is provided over the insulation to protect the cable from.....?
#29. The most commonly used insulation in high voltage cables is....?
#30. In any transmission line, AD-BC=......?
#31. The length of the long transmission line is beyond......?
#32. Which of the following is not used for improving the string efficiency?
#33. If capacitance between two conductors of a 3 phase line is 4 microfarad, then capacitance to each conductor to neutral is....?
#34. Equalising inductance and capacitance of the three phases by a method of .....?
#35. Skin effect is reduced by use of....?
#36. In lightly loaded transmission line having receiving end voltage more than the sending end voltage called.....?
#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. The ratio of line to line capacitance and line to neutral capacitance is....?
#50. Advantage of transmitting power at high voltage....?
#51. The presence of earth in the case of over head lines....?
#52. The sag of the conductors of a transmission line is 2.5 m when the span is 250m. now if the height of supporting towers is increased by 25%, the sag will....?
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. Which of the following is not affect the corona effect?
#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?
Recent Comments