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