11. In a series RC circuit, when the frequency and the resistance are halved, the impedance A. Doubles B. Is halved C. Is reduced to one-fourth D. Cannot be determined without values 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
12. A 2 kΩ resistor is in series with a 0.015 µF capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle? A. 73.4 Ω and θ = -19.5° B. 707 Ω and θ = -19.5° C. 2121 Ω and θ = -19.5° D. 734 Ω and θ = -38.9° 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
13. What is the angular difference between +j4 and -j4? A. 30° B. 90° C. 180° D. 270° 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
14. The impedance of a series RC circuit varies directly with frequency. 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
15. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance A. Increases B. Decreases C. Remains the same D. Doubles 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
16. The circuit phase angle is the angle between the total current and the applied (source) voltage. 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
17. A capacitor with 150 ohm of capacitive reactance is across an ac source. The impedance, expressed in polar form, is A. Z = 150 ohm B. Z = 150 ∠90° ohm C. Z = 150 ∠-90° ohm D. Z = 150 ∠180° ohm 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
18. A 12 kΩ resistor is in series with a 0.02 µF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 ∠0° mA, what is the source voltage expressed in polar form? A. 45.6 V B. 411.3 V C. 0.411 V D. 4.11 V 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
19. An imaginary number is one that exists only in the mind of the mathematician. 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
20. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is A. 19.52 W B. 195.2 W C. 275 W D. 25 W 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
