Discussion
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- Question
What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?
Options- A. 37.8 V
- B. 38 V
- C. 63 V
- D. 101 V
- Correct Answer
- 63 V
- 1. Power stored from the source and then returned to the source is called:
Options- A. apparent power
- B. impedance power
- C. reactive power
- D. true power Discuss
- 2. In a purely capacitive circuit,
Options- A. current leads voltage by 90°
- B. voltage leads current by 90°
- C. current lags voltage by 90°
- D. current and voltage have a phase relationship of 0° Discuss
- 3. If an open capacitor is checked with an ohmmeter, the needle will:
Options- A. stay on zero
- B. stay on infinity
- C. move from zero to infinity
- D. move from infinity to zero Discuss
- 4. In an RC circuit, true power (PR) equals:
Options- A.
- B. VS × I
- C. I2R
- D. VT × RT Discuss
- 5. In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?
Options- A. bandpass
- B. low-pass
- C. high-pass
- D. band-stop Discuss
- 6. The material used between the plates of a capacitor is called its:
Options- A. insulation material
- B. dielectric material
- C. separation material
- D. plate-divider material Discuss
- 7. After which time constant can a capacitor be considered to be fully charged?
Options- A. first
- B. third
- C. fifth
- D. seventh Discuss
- 8. A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is:
Options- A. an integrator
- B. a differentiator
- C. a multiplier
- D. a divider Discuss
- 9. Which of the following determines the capacitance of a capacitor?
Options- A. Plate area, dielectric strength, and plate separation
- B. Voltage rating, dielectric constant, and temperature coefficient
- C. Temperature coefficient, plate area, and plate separation
- D. Plate area, dielectric constant, and plate separation Discuss
- 10. An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?
Options- A. 1 volt
- B. 3 volts
- C. 5 volts
- D. 7 volts Discuss
Capacitors problems
Search Results
Correct Answer: reactive power
Correct Answer: current leads voltage by 90°
Correct Answer: stay on infinity
Correct Answer: I2R
Correct Answer: high-pass
Correct Answer: dielectric material
Correct Answer: fifth
Correct Answer: a differentiator
Correct Answer: Plate area, dielectric constant, and plate separation
Correct Answer: 7 volts
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