31. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is A. 5 mH B. 10 mH C. 5 H D. 10 H Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
32. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is A. 3500 mH B. 350 mH C. 250 mH D. 150 mH Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
33. Higher the self-inductance of a coil, A. Lesser its weber-turns B. Lower the e.m.f. induced C. Greater the flux produced by it D. Longer the delay in establishing steady current through it Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
34. The inductance of a coil will increase under all the following conditions except A. When more length for the same number of turns is provided B. When the number of turns of the coil increase C. When more area for each turn is provided D. When permeability of the core increases Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
35. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns. A. Yes B. No Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
36. As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it A. Lies perpendicular to the magnetic flux B. Lies in a magnetic field C. Cuts magnetic flux D. Moves parallel to the direction of the magnetic field Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
37. The coefficient of coupling between two air core coils depends on A. Self-inductance of two coils only B. Mutual inductance between two coils only C. Mutual inductance and self inductance of two coils D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
38. Air-core coils are practically free from A. Hysteresis losses B. Eddy current losses C. Both A and B D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
39. A laminated iron core has reduced eddy-current losses because A. More wire can be used with less D.C. resistance in coil B. The laminations are insulated from each other C. The magnetic flux is concentrated in the air gap of the core D. The laminations are stacked vertically Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
40. In case of an inductance, current is proportional to A. Voltage across the inductance B. Magnetic field C. Both A and B D. Neither A nor B Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
