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 breakdown of insulation of the cable can be avoided economically by the use of inter-sheaths both and insulating materials with different dielectric constants none of the above 2 / 20 Cables for 220 kV lines are invariably paper insulated rubber insulated compressed oil or compressed gas insulated mica insulated 3 / 20 The intersheaths in the cables are used to avoid the requirement of good insulation none of the above provide proper stress distribution minimize the stress 4 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Polyvinyle chloride Compressed SF6 gas Impregnated paper Vulcanised rubber 5 / 20 The insulating material should have high resistivity all of the above high dielectric strength low permittivity 6 / 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° 7 / 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 30 kV/mm 15 kV/mm 10 kV/mm 8 / 20 PVC stands for positive voltage conductor pressed and varnished cloth polyvinyl chloride post varnish conductor 9 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Polyvinyle chloride Compressed SFe gas Impregnated paper Vulcanised rubber 10 / 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 11 / 20 The electrostatic stress in underground cables is minimum at the conductor and maximum at the sheath maximum at the conductor and minimum at the sheath same at the conductor and the sheath zero at the conductor as well as on the sheath 12 / 20 The advantage of oil filled cables is no ionisation oxidation and formation of voids all of the above more perfect impregnation smaller overall size 13 / 20 Solid type cables are considered unreliable beyond 66 kV because insulation may melt due to higher temperature there is a danger of breakdown of insulation due to the presence of voids skin effect dominates on the conductor of corona loss between conductor and sheath material 14 / 20 If a power cable and a communication cable are to run parallel the minimum distance between the two to avoid interference should be 50 cm 2 cm 400 cm 10 cm 15 / 20 The insulation of the cable decreases with either or the increase in length of the insulation the decrease in the length of the insulation none of the above 16 / 20 High tension cables are generally used up to 132 kV 11kV 66 kV 33kV 17 / 20 In the cables sheaths are used to prevent the moisture from entering the cable provide proper insulation none of the above provide enough strength 18 / 20 If the length of a cable is doubled its capacitance becomes double becomes one-half remains unchanged becomes one-fourth 19 / 20 The material for armouring on cable is usually galvanised steel wire steel tape none of the above any of the above 20 / 20 Cables generally used beyond 66 kV are armoured belted oil filled S.L. type 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
