Discussion
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- Question
For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
Options- A. 19.52 W
- B. 195.2 W
- C. 275 W
- D. 25 W
- Correct Answer
- 195.2 W
- 1. 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?
Options- A. 129 Ω
- B. 12.9 Ω
- C. 167 Ω
- D. 73 Ω Discuss
- 2. The complex number 6 + j6 is equivalent to
Options- A. 6∠45°
- B. 36∠45°
- C. 8.48∠45°
- D. 8.48∠90° Discuss
- 3. The complex number 40∠ 55° is equivalent to
Options- A. 55 + j55
- B. 40 + j40
- C. 45.88 + j65.52
- D. 22.94 + j32.76 Discuss
- 4. In the complex plane, the number 14 ? j5 is located in the
Options- A. first quadrant
- B. second quadrant
- C. third quadrant
- D. fourth quadrant Discuss
- 5. 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
Options- A. Z = 47 Ω + j150 Ω
- B. Z = 47 Ω ? j150 Ω
- C. Z = 197 Ω
- D. Z = 103 Ω Discuss
- 6. A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
Options- A. 0 Hz
- B. 12 kHz
- C. 6 kHz
- D. 18 kHz Discuss
- 7. What is the angular difference between +j4 and ?j4?
Options- A. 30°
- B. 90°
- C. 180°
- D. 270° Discuss
- 8. 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
Options- A. 9.2 mA
- B. 92 mA
- C. 4.6 mA
- D. 460 mA Discuss
- 9. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
Options- A. increases
- B. decreases
- C. remains the same
- D. doubles Discuss
- 10. 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
Options- A. 200 mA
- B. 100 mA
- C. 282 mA
- D. 141 mA Discuss
RC Circuits problems
Search Results
Correct Answer: 129 Ω
Correct Answer: 8.48∠45°
Correct Answer: 22.94 + j32.76
Correct Answer: fourth quadrant
Correct Answer: Z = 47 Ω ? j150 Ω
Correct Answer: 6 kHz
Correct Answer: 180°
Correct Answer: 4.6 mA
Correct Answer: increases
Correct Answer: 141 mA
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