Electronics-Capacitor Question and Answer
Electronics-Capacitor Question and Answer
31. If a charged capacitor is disconnected from a circuit, it will:
- immediately discharge
- recharge
- remain charged
- leak the charge
32. The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:
- plate separation
- negative plate only
- field strength
- charge difference
33. How is ac current related to ac voltage in a purely capacitive circuit?
- AC current is 0.707 of the ac voltage.
- AC current lags ac voltage.
- AC current is 0.637 of the ac voltage.
- AC current leads ac voltage.
34. For a given charge difference, electrostatic field strength varies according to:
- plate differential
- plate area
- plate distance
- dielectric quantity
35. A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is:
- an integrator
- a differentiator
- a multiplier
- a divider
36. Capacitive reactance values connected in series offer
- an increase in total XC
- a decrease in total XC
- no change in total XC
- total opposition to voltage in the circuit
37. The quantity that represents an ideal capacitor dissipating 0 W of power is
- instantaneous power
- true power
- reactive power
- resistive power
38. If a capacitor is placed across a 20 V source, what will be the amount of charge after 5 tc?
- 5.0 V
- 12.8 V
- 13.5 V
- 20 V
39. What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms?
- 0.2 ohms
- 3.5 ohms
- 4.6 ohms
- 13 ohms
40. What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?
- 0.001
- 50
- 80
- 4.0