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 In the cables sheaths are used to prevent the moisture from entering the cable provide proper insulation none of the above provide enough strength 2 / 20 The intersheaths in the cables are used to provide proper stress distribution minimize the stress none of the above avoid the requirement of good insulation 3 / 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 4 / 20 The insulating material should have high resistivity low permittivity high dielectric strength all of the above 5 / 20 The material for armouring on cable is usually any of the above steel tape none of the above galvanised steel wire 6 / 20 High tension cables are generally used up to 33kV 11kV 66 kV 132 kV 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 The breakdown of insulation of the cable can be avoided economically by the use of both and inter-sheaths none of the above insulating materials with different dielectric constants 9 / 20 PVC stands for polyvinyl chloride post varnish conductor pressed and varnished cloth positive voltage conductor 10 / 20 The advantage of oil filled cables is smaller overall size no ionisation oxidation and formation of voids more perfect impregnation all of the above 11 / 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 12 / 20 If the insulation is replaced by one of relative permittivity 2 the capacitance of the cable will become double four times one half none of the above 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 The electrostatic stress in underground cables is 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 minimum at the conductor and maximum at the sheath 15 / 20 Cables for 220 kV lines are invariably mica insulated rubber insulated paper insulated compressed oil or compressed gas insulated 16 / 20 Cables generally used beyond 66 kV are belted armoured S.L. type oil filled 17 / 20 Is a cable is to be designed for use on 1000 kV which insulation would you prefer ? Polyvinyle chloride Impregnated paper Compressed SFe gas Vulcanised rubber 18 / 20 If the length of a cable is doubled its capacitance becomes one-half becomes double becomes one-fourth remains unchanged 19 / 20 In cables the charging current lags the voltage by 180° leads the voltage by 90° leads the voltage by 180° lags the voltage by 90° 20 / 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 10 cm 2 cm 400 cm 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
