CHAPTER 11: CAPACITANCE

If the value (capacitance) of a capacitor remains constant when the temperature changes

within a reasonable range, then its temperature coefficient is

(a) zero.

(b) unity.

(c) infinite.

(d) undefined.

A

You can increase the value of a mica-dielectric capacitor, assuming all other factors remain

constant, by replacing the mica with

(a) strontium titanate.

(b) polyethylene.

(c) paper.

(d) air.

A

Fill in the blank to make the following sentence true: "As you reduce the value of a capacitor,

it ________ to completely charge after you connect a 6-V battery to its plates, assuming all other

factors remain constant."

(a) takes more time

(b) becomes more difficult

(c) takes less time

(d) takes more energy

C

Which of the following values would you most likely find in an air-variable capacitor?

(a) 1000 μF

(b) 68 pF

(c) 3.3 μF

(d) 50,000 pF

B

Which of the following values would you least likely find in a single-layer disk-ceramic

capacitor?

(a) 150 pF

(b) 680 pF

(c) 0.01 μF

(d) 330 μF

D

A capacitance of 0.01 nanofarad is the same as a capacitance of

(a) 0.1 pF.

(b) 1 pF.

(c) 10 pF.

(d) 100 pF.

C

If you connect four 100-pF capacitors in series, you get a net capacitance of

(a) 25 pF.

(b) 50 pF.

(c) 100 pF.

(d) 400 pF.

A

If you connect four 100-pF capacitors in parallel, you get a net capacitance of

(a) 25 pF.

(b) 50 pF.

(c) 100 pF.

(d) 400 pF.

D

If you connect four 100-pF capacitors in a 2 x 2 series-parallel matrix, you get a net

capacitance of

(a) 25 pF.

(b) 50 pF.

(c) 100 pF.

(d) 400 pF.

C

If you connect nine 100-pF capacitors in a 3 x 3 series-parallel matrix, you get a net

capacitance of

(a) 25 pF.

(b) 50 pF.

(c) 100 pF.

(d) 400 pF.

C

The main advantage of air as a dielectric material for capacitors is the fact that air

(a) allows for a lot of capacitance in a small volume.

(b) exhibits low loss.

(c) works well at low voltages.

(d) has a high dielectric constant.

B

A capacitance of 6800 nF is the same as

(a) 0.06800 μF.

(b) 0.6800 μF.

(c) 6.800 μF.

(d) 68.00 μF.

C

Which of the following properties is characteristic of tantalum capacitors?

(a) High reliability

(b) High capacitance per unit of volume

(c) High efficiency

(d) All of the above

D

Which of the following values would you most expect to find in an electrolytic capacitor?

(a) 0.100 pF

(b) 100 pF

(c) 0.100 μF

(d) 100 μF

D

You connect a 10-pF capacitor in parallel with a 20-pF capacitor. What's the net capacitance?

(a) 30 pF

(b) 15 pF

(c) 6.7 pF

(d) 5.5 pF

A

You connect a 10-pF capacitor in series with a 20-pF capacitor. What's the net capacitance?

(a) 30 pF

(b) 15 pF

(c) 6.7 pF

(d) 5.5 pF

C

You find a capacitor rated at 220 pF ±10%. Which of the following capacitance values lies

outside the acceptable range?

(a) 180 pF

(b) 195 pF

(c) 246 pF

(d) All of the above

D

A capacitor, rated at 330 pF, shows an actual value of 340 pF. By how much does its actual

capacitance differ from its rated capacitance?

(a) +2.94%

(b) +3.03%

(c) -2.94%

(d) -3.03%

B

Which of the following values would you most expect to see in a paper capacitor?

(a) 0.001 nF

(b) 1.00 pF

(c) 0.01 μF

(d) 100 μF

C

If the number of plates in an air-variable capacitor decreases while all other factors remain

constant,

(a) the capacitance goes up.

(b) the capacitance goes down.

(c) the capacitance stays the same.

(d) You'll need more information to answer this question.

B