# 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 +**

*j*3 is located in the- (A) First
quadrant

- (B) Second
quadrant

- (C) Third
quadrant

- (D) Fourth
quadrant

**5. What is the angular difference between +**

*j*4 and -*j*4?- (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 kÎ© resistor is in series with a 0.015 Î¼F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?**

- (A) 73.4 Î© and Î¸ = -19.5°

- (B) 707 Î© and Î¸ = -19.5°

- (C) 2121 Î© and Î¸ = -19.5°

- (D) 734 Î© and Î¸ = -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 kÎ©. Current flow in the circuit is**

- (A) 9.2 mA

- (B) 92 mA

- (C) 4.6 mA

- (D) 460 mA

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