Capacitors Quiz

The capacitance of a capacitor will be larger if

• all of the above.

• the area of the plates is increased.

• air replaces oil as the dielectric.

• the spacing between the plates is increased.

The major advantage of a mica capacitor over other types is

• they have the largest available capacitances.

• their voltage rating is very high

• all of the above.

• they are polarized.

Electrolytic capacitors are useful in applications where

• low leakage current is required.

• a precise value of capacitance is required.

• all of the above.

• large capacitance is required.

If a 0.015 μF capacitor is in series with a 6800 pF capacitor, the total capacitance is

• 1568 pF.

• 4678 pF.

• 6815 pF.

• 0.022 μF.

Two capacitors that are initially uncharged are connected in series with a dc source. Compared to the larger capacitor, the smaller capacitor will have

• less voltage.

• more charge.

• the same voltage.

• the same charge.

When a capacitor is connected through a resistor to a dc voltage source, the charge on the capacitor will reach 50% of its final charge in

• less than one time constant.

• exactly one time constant.

• greater than one time constant.

• answer depends on the amount of voltage.

When a capacitor is connected through a series resistor and switch to a dc voltage source, the voltage across the resistor after the switch is closed has the shape of

• none of the above.

• a falling exponential.

• a rising exponential.

• a straight line.

The capacitive reactance of a 100 μF capacitor to 60 Hz is

• 26.5 Ω.

• 265 Ω.

• 6.14 kΩ.

• 37.7 Ω.

If an sine wave from a function generator is applied to a capacitor, the current will

• be in phase with the voltage.

• lag voltage by 90o.

• lag voltage by 45o.

• none of the above.

A switched capacitor emulates a

• resistor.

• larger capacitor.

• smaller capacitor.

• battery.