21. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is A. Good B. Open C. Shorted D. Partly shorted 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
22. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field A. Increases B. Decreases C. Remains the same D. Doubles 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
23. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field A. Is quartered B. Quadruples C. Doubles D. Does not change 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
24. The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately A. 6.9 µH B. 14 µH C. 2.2 µH D. 155 µH 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
25. Inductors add in parallel. A. True B. False 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
26. A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value? A. 0.48 s B. 0.48 ms C. 0.48 µs D. 48 s 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
27. A 240 µH inductor is equivalent to a A. 0.240 mH inductor B. 0.000240 mH inductor C. 240 mH inductor D. 240 H inductor 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
28. The inductance of an iron-core coil decreases if A. The number of turns is decreased B. The iron core is removed C. The length of the coil decreases D. None of the above 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
29. The permeability of a core material is an indication of the ability of the material to establish a magnetic field. A. True B. False 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
30. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is A. 87 mA B. 870 mA C. 87 A D. 337 mA 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
