By Surendra | June 11, 2020 0 Comment 0% 2 Created by Surendra Electrician Cables Quiz in English Set 1 All Important Question Answers for Electrician Related Exams 1 / 20 The insulation of the cable decreases with the decrease in the length of the insulation none of the above either or the increase in length of the insulation 2 / 20 In cables the charging current leads the voltage by 180° leads the voltage by 90° lags the voltage by 180° lags the voltage by 90° 3 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Impregnated paper Vulcanised rubber Compressed SF6 gas Polyvinyle chloride 4 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Compressed SFe gas Polyvinyle chloride Impregnated paper Vulcanised rubber 5 / 20 The advantage of oil filled cables is all of the above no ionisation oxidation and formation of voids smaller overall size more perfect impregnation 6 / 20 PVC stands for polyvinyl chloride post varnish conductor pressed and varnished cloth positive voltage conductor 7 / 20 High tension cables are generally used up to 132 kV 33kV 66 kV 11kV 8 / 20 In the cables sheaths are used to provide enough strength none of the above provide proper insulation prevent the moisture from entering the cable 9 / 20 The insulating material should have low permittivity high dielectric strength high resistivity all of the above 10 / 20 The material for armouring on cable is usually steel tape none of the above any of the above galvanised steel wire 11 / 20 Cables for 220 kV lines are invariably compressed oil or compressed gas insulated mica insulated rubber insulated paper insulated 12 / 20 The electrostatic stress in underground cables is maximum at the conductor and minimum at the sheath minimum at the conductor and maximum at the sheath same at the conductor and the sheath zero at the conductor as well as on the sheath 13 / 20 The intersheaths in the cables are used to provide proper stress distribution avoid the requirement of good insulation minimize the stress none of the above 14 / 20 If the length of a cable is doubled its capacitance remains unchanged becomes one-fourth becomes one-half becomes double 15 / 20 Cables generally used beyond 66 kV are belted oil filled armoured S.L. type 16 / 20 Solid type cables are considered unreliable beyond 66 kV because there is a danger of breakdown of insulation due to the presence of voids of corona loss between conductor and sheath material skin effect dominates on the conductor insulation may melt due to higher temperature 17 / 20 If a power cable and a communication cable are to run parallel the minimum distance between the two to avoid interference should be 400 cm 2 cm 50 cm 10 cm 18 / 20 If a cable of homogeneous insulation has a maximum stress of 10 kV/mm then the dielectric strength of insulation should be 15 kV/mm 30 kV/mm 5 kV/mm 10 kV/mm 19 / 20 The breakdown of insulation of the cable can be avoided economically by the use of none of the above insulating materials with different dielectric constants inter-sheaths both and 20 / 20 If the insulation is replaced by one of relative permittivity 2 the capacitance of the cable will become double four times none of the above one half कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। NameEmailPhone NumberDistrictSchool/Coaching Name Your score is LinkedIn Facebook VKontakte 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
