By Surendra | June 11, 2020 0 Comment 0% 0 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 Lenz Faraday Coulomb Newton 2 / 20 Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be halved unaffected doubled quadrupled 3 / 20 The magnitude of the induced e.m.f. in a conductor depends on the flux density of the magnetic field amount of flux cut amount of flux linkages rate of change of flux-linkages 4 / 20 The inductance of a coil will increase under all the following conditions except when more length for the same number of turns is provided when the number of turns of the coil increase when more area for each turn is provided when permeability of the core increases 5 / 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 mutual inductance series aiding inductance capacitance self-inductance 6 / 20 As per Faraday’s laws of electromagnetic induction an e.m.f. is induced in a conductor whenever it lies in a magnetic field moves parallel to the direction of the magnetic field lies perpendicular to the magnetic flux cuts magnetic flux 7 / 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 decrease increase remain the same 8 / 20 Which of the following circuit element stores energy in the electromagnetic field ? Inductance Variable resistor Condenser Resistance 9 / 20 A crack in the magnetic path of an inductor will result in zero inductance increased inductance reduced inductance unchanged inductance 10 / 20 Mutually inductance between two magnetically-coupled coils depends on all of the above cross-sectional area of their common core permeability of the core the number of their turns 11 / 20 Air-core coils are practically free from both and none of the above eddy current losses hysteresis losses 12 / 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 coil current the resistance of magnetic path variation in voltage to the coil change of number of turns of coil 13 / 20 In case of an inductance current is proportional to both and magnetic field voltage across the inductance neither nor 14 / 20 Higher the self-inductance of a coil greater the flux produced by it lower the e.m.f. induced lesser its weber-turns longer the delay in establishing steady current through it 15 / 20 Which of the following is not a unit of inductance ? All of the above Henry Volt second per ampere Coulomb/volt ampere 16 / 20 Which circuit element(s) will oppose the change in circuit current ? Inductance and capacitance Capacitance only Resistance only Inductance only 17 / 20 A laminated iron core has reduced eddy-current losses because more wire can be used with less D.C. resistance in coil the magnetic flux is concentrated in the air gap of the core the laminations are stacked vertically the laminations are insulated from each other 18 / 20 Which of the following circuit elements will oppose the change in circuit current ? Resistance All of the above Capacitance Inductance 19 / 20 Which of the following inductor will have the least eddy current losses ? Iron core Air core Laminated iron core Powdered iron core 20 / 20 An open coil has zero resistance and inductance infinite resistance and zero inductance infinite resistance and normal inductance zero resistance and high inductance 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
