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