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