# Practice Test: Question Set - 03

**1. A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is**

- (A)

*Z*= 47 Ω +

*j*150 Ω

- (B)

*Z*= 47 Ω -

*j*150 Ω

- (C)

*Z*= 197 Ω

- (D)

*Z*= 103 Ω

**2. In a parallel**

*RC*circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is- (A) 200 mA

- (B) 100 mA

- (C) 282 mA

- (D) 141 mA

**3. A 6 kHz sinusoidal voltage is applied to a series**

*RC*circuit. The frequency of the voltage across the resistor is- (A) 0 Hz

- (B) 12 kHz

- (C) 6 kHz

- (D) 18 kHz

**4. A complex number represents a phasor quantity.**

- (A) True

- (B) False

**5. In the complex plane, the number 14 -**

*j*5 is located in the- (A) First
quadrant

- (B) Second
quadrant

- (C) Third
quadrant

- (D) Fourth
quadrant

**6. A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance,**

*Z*?- (A) 129 Ω

- (B) 12.9 Ω

- (C) 167 Ω

- (D) 73 Ω

**7. The resistor voltage is always out of phase with the current.**

- (A) True

- (B) False

**8. 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

**9. The capacitor voltage always leads the current by 90°.**

- (A) True

- (B) False

**10. A 2 kΩ resistor and a 0.002 μF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is**

- (A) 84.5 mW

- (B) 845 mW

- (C) 13 mW

- (D) 130 mW

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