PHY 102 Pre Test 0% 0 Created by Oladeji Timilehin Daramola PHY 102 NOTE: The quiz is meant for revision purpose only! Join the 100 level group to access other quiz CLICK TO JOIN 1 / 20 The value of E within the field due to a point charge can be found with the help of Faraday's laws Kirchhoff s laws Coulomb's laws none of the above 2 / 20 For which of the following parameter variation,the capacitance of the capacitor remains unaffected ? Thickness of the plates Nature of dielectric Area of the plate Distance between plate 3 / 20 The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed". The above statement is associated with Coulomb's square law Gauss's law Maxwell's second law 4 / 20 Which of the following statements is incorrect ? The leakage resistance of ceramic capacitors is generally high The stored energy in a capacitor decreases with reduction in value of capacitance The stored energy in a capacitor increases with applied voltage A wire cable has distributed capacitance between the conductors 5 / 20 Ceramic capacitors must be connected incorrect polarity Electrolytic capacitors must be connected incorrect polarity Air capacitors have a black band to indicate the outside foil Mica capacitors are available in capacitance values of 5 to 20 uF 6 / 20 A single core cable used on33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is 62 x105 V/m 72 x105 V/m 82 x105 V/m 92 x105 V/m 7 / 20 The electric field at a point situated at a distance d from straight charged conductor is proportional to inversely proportional to d inverse to d None of the above 8 / 20 An electrolytic capacitor is generally made to provide Low capacitance fixed capacitance variable capacitance large value of capacitance 9 / 20 The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value. 37,initial 62,initial 62,final 37,final 10 / 20 The bridge used for the measurement of the value of the capacitance is ? Wien's bridge Wheatstone bridge Schering bridge Hay's bridge 11 / 20 Which of the following capacitors will have the least variation? Paper capacitor Ceramic capacitor Silver plated mica capacitor None of the above 12 / 20 is that property of a capacitor which delays any change of voltage across it. Inductance Capacitance Potential gradient None of the above 13 / 20 A condenser suitable for D.C. only is ? metallic plate variable gang condense metallic paper capacitor oil impregnated paper condenser poled aluminium electrolytic condenser 14 / 20 Inorder to remove static electricity from machinery construct insulated cabins insulate the machinery ground the framework humidify the surroundings 15 / 20 A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is 150 joules 50 joules 200 joules 250 joules 16 / 20 Mica capacitors are characterised by all of the following except low losses low leakage reactance accurate value stable stable operation 17 / 20 The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be 36 x10 N 36 x107 N 36 x108 N 36 x109 N 18 / 20 The presence of an uncharged conductor near a charged one increases the All of the above potential of the charged conductor capacity of the charged conductor charge of the charged conductor 19 / 20 What will happen to an insulating medium if voltage more than the breakdown voltage is applied onit ? It will become magnetic It will melt It will get punctured or cracked Its molecular structure will get changed 20 / 20 In a capacitor,the electric charge is stored in metal plates dielectric dielectric as well as metal plates none of the above Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback
