RC Circuits Online MCQ Practice Test - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. 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
(A) 3 V
(B) 27 V
(C) 19.2 V
(D) 1.9 V

2. Point +4 on the complex plane is
(A) 4 units above the origin on the j axis
(B) 4 units below the origin on the j axis
(C) 4 units right of the origin on the real axis
(D) 4 units left of the origin on the real axis

3. Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.
(A) True
(B) False

4. In the complex plane, the number 4 + j3 is located in the

5. What is the angular difference between +j4 and -j4?
(A) 30°
(B) 90°
(C) 180°
(D) 270°

6. The circuit phase angle is the angle between the total current and the applied (source) voltage.
(A) True
(B) False

7. 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°

8. 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

9. In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.
(A) True
(B) False

10. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is
(A) 9.2 mA
(B) 92 mA
(C) 4.6 mA
(D) 460 mA

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