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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