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- Question
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
Options- A. 84.5 mW
- B. 845 mW
- C. 13 mW
- D. 130 mW
- Correct Answer
- 84.5 mW
- 1. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
Options- A. R = XC
- B. R > XC
- C. R < XC
- D. R = 5XC Discuss
- 2. Point +4 on the complex plane is
Options- 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 Discuss
- 3. 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?
Options- A. 45.6 V
- B. 411.3 V
- C. 0.411 V
- D. 4.11 V Discuss
- 4. In the complex plane, the number 4 + j3 is located in the
Options- A. first quadrant
- B. second quadrant
- C. third quadrant
- D. fourth quadrant Discuss
- 5. A positive angle of 30° is equivalent to a negative angle of
Options- A. ?30°
- B. ?330°
- C. ?60°
- D. ?180° Discuss
- 6. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
Options- A. increases
- B. decreases
- C. does not change
- D. decreases to zero Discuss
- 7. A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is
Options- A. 212 Ω
- B. 2.12 mS + j3.14 mS
- C. 3.14 mS + j2.12 mS
- D. 318.3 Ω Discuss
- 8. 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
Options- A. 3 V
- B. 27 V
- C. 19.2 V
- D. 1.9 V Discuss
- 9. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
Options- A. 4.24
- B. 3.46
- C. 2.16
- D. 21.63 Discuss
- 10. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
Options- A. Z = 150
- B. Z = 150∠90°Ω
- C. Z = 150 ∠?90°Ω
- D. Z = 150∠180°Ω Discuss
RC Circuits problems
Search Results
Correct Answer: R < XC
Correct Answer: 4 units right of the origin on the real axis
Correct Answer: 4.11 V
Correct Answer: first quadrant
Correct Answer: ?330°
Correct Answer: increases
Correct Answer: 2.12 mS + j3.14 mS
Correct Answer: 19.2 V
Correct Answer: 21.63
Correct Answer: Z = 150 ∠?90°Ω
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