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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 + j150 Ω
    (B) Z = 47 Ω - j150 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 - j5 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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