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
- (A) First
quadrant
- (B) Second
quadrant
- (C) Third
quadrant
- (D) Fourth
quadrant
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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