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 If a cable of homogeneous insulation has a maximum stress of 10 kV/mm then the dielectric strength of insulation should be 5 kV/mm 10 kV/mm 15 kV/mm 30 kV/mm 2 / 20 The insulating material should have all of the above high dielectric strength high resistivity low permittivity 3 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Vulcanised rubber Impregnated paper Compressed SFe gas Polyvinyle chloride 4 / 20 Solid type cables are considered unreliable beyond 66 kV because insulation may melt due to higher temperature of corona loss between conductor and sheath material there is a danger of breakdown of insulation due to the presence of voids skin effect dominates on the conductor 5 / 20 If the length of a cable is doubled its capacitance remains unchanged becomes one-fourth becomes double becomes one-half 6 / 20 The intersheaths in the cables are used to minimize the stress provide proper stress distribution avoid the requirement of good insulation none of the above 7 / 20 In cables the charging current leads the voltage by 90° leads the voltage by 180° lags the voltage by 90° lags the voltage by 180° 8 / 20 Cables for 220 kV lines are invariably mica insulated rubber insulated compressed oil or compressed gas insulated paper insulated 9 / 20 High tension cables are generally used up to 11kV 33kV 66 kV 132 kV 10 / 20 The breakdown of insulation of the cable can be avoided economically by the use of none of the above both and insulating materials with different dielectric constants inter-sheaths 11 / 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 50 cm 2 cm 10 cm 12 / 20 In the cables sheaths are used to provide enough strength prevent the moisture from entering the cable none of the above provide proper insulation 13 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Compressed SF6 gas Polyvinyle chloride Impregnated paper Vulcanised rubber 14 / 20 PVC stands for pressed and varnished cloth positive voltage conductor polyvinyl chloride post varnish conductor 15 / 20 The material for armouring on cable is usually steel tape none of the above galvanised steel wire any of the above 16 / 20 If the insulation is replaced by one of relative permittivity 2 the capacitance of the cable will become none of the above double four times one half 17 / 20 The advantage of oil filled cables is smaller overall size all of the above no ionisation oxidation and formation of voids more perfect impregnation 18 / 20 The insulation of the cable decreases with either or none of the above the decrease in the length of the insulation the increase in length of the insulation 19 / 20 Cables generally used beyond 66 kV are armoured oil filled S.L. type belted 20 / 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 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
