By Surendra | June 11, 2020 0 Comment 0% 1 Created by Surendra Electromagnetic Induction Quiz in English Set 1 All Important Question Answers for Electrician Related Exams 1 / 20 The law that the induced e.m.f. and current always oppose the cause producing them is due to Faraday Lenz Newton Coulomb 2 / 20 A crack in the magnetic path of an inductor will result in zero inductance reduced inductance unchanged inductance increased inductance 3 / 20 Air-core coils are practically free from eddy current losses none of the above hysteresis losses both and 4 / 20 As per Faraday’s laws of electromagnetic induction an e.m.f. is induced in a conductor whenever it lies perpendicular to the magnetic flux cuts magnetic flux moves parallel to the direction of the magnetic field lies in a magnetic field 5 / 20 The inductance of a coil will increase under all the following conditions except when permeability of the core increases when more length for the same number of turns is provided when more area for each turn is provided when the number of turns of the coil increase 6 / 20 Which of the following inductor will have the least eddy current losses ? Air core Iron core Powdered iron core Laminated iron core 7 / 20 Mutually inductance between two magnetically-coupled coils depends on cross-sectional area of their common core the number of their turns all of the above permeability of the core 8 / 20 Which circuit element(s) will oppose the change in circuit current ? Inductance only Capacitance only Inductance and capacitance Resistance only 9 / 20 Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be halved quadrupled doubled unaffected 10 / 20 The magnitude of the induced e.m.f. in a conductor depends on the amount of flux linkages flux density of the magnetic field rate of change of flux-linkages amount of flux cut 11 / 20 A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by variation in voltage to the coil change of number of turns of coil variation in coil current the resistance of magnetic path 12 / 20 An open coil has zero resistance and inductance infinite resistance and normal inductance zero resistance and high inductance infinite resistance and zero inductance 13 / 20 A laminated iron core has reduced eddy-current losses because the laminations are insulated from each other the laminations are stacked vertically more wire can be used with less D.C. resistance in coil the magnetic flux is concentrated in the air gap of the core 14 / 20 Which of the following is not a unit of inductance ? All of the above Volt second per ampere Coulomb/volt ampere Henry 15 / 20 In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will initially increase and then decrease remain the same increase decrease 16 / 20 Higher the self-inductance of a coil longer the delay in establishing steady current through it greater the flux produced by it lesser its weber-turns lower the e.m.f. induced 17 / 20 Which of the following circuit elements will oppose the change in circuit current ? Resistance Capacitance All of the above Inductance 18 / 20 The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as self-inductance capacitance mutual inductance series aiding inductance 19 / 20 Which of the following circuit element stores energy in the electromagnetic field ? Inductance Resistance Condenser Variable resistor 20 / 20 In case of an inductance current is proportional to magnetic field both and voltage across the inductance neither nor कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। NameEmailPhone NumberDistrictSchool/Coaching Name Your score is LinkedIn Facebook VKontakte 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
