RC Circuits Online Test – Multiple Choice Questions and Answers 1. What is the effect of increasing the resistance in a series RC circuit? The current will increase There will be no effect at all The input voltage will increase The phase shift will decrease 2. In the complex plane, the number 14 – j5 is located in the third quadrant first quadrant fourth quadrant second quadrant 3. In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is 1.9 V 19.2 V 27 V 3 V 4. Power that is measured in volt-amperes is called true power impedance power reactive power apparent power 5. What is the angular difference between +j4 and –j4? 30° 90° 180° 270° 6. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is 19.52 W 195.2 W 275 W 25 W 7. In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is 45 Vac 50 Vac 60 Vac 65 Vac 8. Which statement about a series RC circuit is true? The capacitor’s voltage drop is in phase with the resistor’s voltage drop The current leads the source voltage The resistor voltage lags the current The current lags the source voltage 9. The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency must be decreased has no effect must be increased is held constant 10. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit decreases to zero increases does not change decreases Loading … Question 1 of 10
