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