Home Chapter 9 Multiple Choice

# Multiple Choice

This activity contains 13 questions.

## A capacitor has 25 V across its plates and a stored charge of 1500 C. What is the capacitance value?

 60 pF 60 F 16.67 mF 37.5 mF

## Which of the following determines the capacitance of a capacitor?

 Plate area, dielectric strength, and plate separation Voltage rating, dielectric constant, and temperature coefficient Temperature coefficient, plate area, and plate separation Plate area, dielectric constant, and plate separation

## What is the capacitance of the circuit shown in Figure 1?

 0.066 F 0.9 F 65.97 pF 900 pF

## Which of the following statements is true?

 The voltage a capacitor is charged to can change instantaneously. The current in a capacitive circuit takes time to change. A fully charged capacitor appears as a short to dc current. An uncharged capacitor appears as a short to an instantaneous change in current.

## How long would it take the capacitor in Figure 2 to completely charge if the switch was in position 1?

 22 ms 69 ms 345 ms 440 ms

## How long would it take the capacitor in Figure 2 to completely discharge if the switch was in position 2?

 22 ms 69 ms 345 ms 420 ms

## In a purely capacitive circuit,

 current leads voltage by 90° voltage leads current by 90° current lags voltage by 90° current and voltage have a phase relationship of 0°

## The quantity that represents an ideal capacitor dissipating 0 W of power is

 instantaneous power true power reactive power resistive power

## What is the reactive power in Figure 3?

 0 VAR 691 VAR 44.23 mVAR 1.45 kVAR

## Which material has the highest dielectric strength?

 Air Paper Mica Oil

## In a capacitive circuit, current flow is limited to

 charging periods discharging periods neither charging periods nor discharging periods both charging periods and discharging periods

## What is the value of a capacitor labeled 102?

 10,000 pF 1000 pF 1000 F 10,000 F

## 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