Which of the following circuit elements will oppose the change in circuit current? Capacitance Inductance All of the listed here Resistance TRUE ANSWER : ? YOUR ANSWER : ?
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is 6 mH 12 mH 36 mH 18 mH TRUE ANSWER : ? YOUR ANSWER : ?
The magnitude of the induced e.m.f. in a conductor depends on the Amount of flux cut Rate of change of flux-linkages Flux density of the magnetic field Amount of flux linkages TRUE ANSWER : ? YOUR ANSWER : ?
An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be 4 A/s 12 A/s 16 A/s 20 A/s TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following inductor will have the least eddy current losses? Laminated iron core Powdered iron core Air core Iron core TRUE ANSWER : ? YOUR ANSWER : ?
An open coil has Infinite resistance and zero inductance Zero resistance and inductance Zero resistance and high inductance Infinite resistance and normal inductance TRUE ANSWER : ? YOUR ANSWER : ?
If current in a conductor increases then according to Lenz's law self-induced voltage will Aid the increasing current Produce current opposite to the increasing current Aid the applied voltage Tend to decrease the amount of current TRUE ANSWER : ? YOUR ANSWER : ?
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by The resistance of magnetic path Variation in voltage to the coil Change of number of turns of coil Variation in coil current TRUE ANSWER : ? YOUR ANSWER : ?
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is 0.02 wb 20 wb 0.2 wb 2 wb TRUE ANSWER : ? YOUR ANSWER : ?
The law that the induced e.m.f. and current always oppose the cause producing them is due to Faraday Coulomb Newton Lenz TRUE ANSWER : ? YOUR ANSWER : ?