Electronics-Capacitor Question and Answer
Electronics-Capacitor Question and Answer
21. What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?
- 37.8 V
- 38 V
- 63 V
- 101 V
22. Power stored from the source and then returned to the source is called:
- apparent power
- impedance power
- reactive power
- true power
24. A source voltage across a capacitor will:
- lead the current by 90 degrees
- lead the current by 180 degrees
- lag the current by 90 degrees
- lag the current by 180 degrees
25. An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?
- 1 volt
- 3 volts
- 5 volts
- 7 volts
26. The material used between the plates of a capacitor is called its:
- insulation material
- dielectric material
- separation material
- plate-divider material
27. When a circuit consists of a capacitor and a resistor in series with a voltage source, and the voltage across the resistor is zero, then the capacitor is:
- charging
- discharging
- fully charged
- fully discharged
29. 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?
- bandpass
- low-pass
- high-pass
- band-stop
30. A practical capacitor
- is a short to dc
- looks like a capacitor in parallel with a resistor
- is an open to ac
- stores energy in a magnetic field