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