FCC Commercial Element 3 pool, section 20

Subelement C

Components

Section 20

Capacitors

320C1

What factors determine the capacitance of a capacitor?

A.
Voltage on the plates and distance between the plates.
B.
Voltage on the plates and the dielectric constant of the material between the plates.
C.
Amount of charge on the plates and the dielectric constant of the material between the plates.
Correct Answer
D.
Distance between the plates and the dielectric constant of the material between the plates.

320C1

What factors determine the capacitance of a capacitor?

Distance between the plates and the dielectric constant of the material between the plates.

The capacitance, measured in Farads depends on:

How big are the plates
Distance between the plates
How much the material making up the plates can handle the electrostatic charges.

\[\frac{\text{ ℇ A }}{\text{ d}} = \text{ Capacitance, in F }\]

A - an area the plates are in the same space, could touch
ℇ - it is the dielectric's permittivity
d - a distance between the plates
C - is the capacitance, measured in Farads

For more information, please see All About Circuits site for the article Factors Affecting Capacitance.

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320C2

In Figure 3C4, if a small variable capacitor were installed in place of the dashed line, it would?

A.
Increase gain.
B.
Increase parasitic oscillations.
Correct Answer
C.
Decrease parasitic oscillations.
D.
Decrease crosstalk.

320C2

In Figure 3C4, if a small variable capacitor were installed in place of the dashed line, it would?

Decrease parasitic oscillations.

See Wikipedia's article on Parasitic oscillation

Also, see the Cadence site for the article Power Amplifier Oscillation: Parasitics and Effects on Amplifiers

And, see In Compliance site for the article Parasitic Oscillations and EMI Emissions

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320C3

In Figure 3C4, which component (labeled 1 through 4) is used to provide a signal ground?

A.
1
Correct Answer
B.
2
C.
3
D.
4

320C3

In Figure 3C4, which component (labeled 1 through 4) is used to provide a signal ground?

sammylandler:

Option number 2 on this diagram is correct because it is located next to the ground schematic symbol.

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320C4

In Figure 3C5, which capacitor (labeled 1 through 4) is being used as a bypass capacitor?

A.
1
B.
2
Correct Answer
C.
3
D.
4

320C4

In Figure 3C5, which capacitor (labeled 1 through 4) is being used as a bypass capacitor?

The number 3 capacitor bypasses the 100 ohms resistor.

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320C5

In Figure 3C5, the 1 μF capacitor is connected to a potentiometer that is used to:

A.
Increase gain.
B.
Neutralize amplifier.
C.
Couple.
Correct Answer
D.
Adjust tone.

320C5

In Figure 3C5, the 1 μF capacitor is connected to a potentiometer that is used to:

Adjust tone.

It is connected to an adjustable resistors, so it adjusts the tone.

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320C6

What is the purpose of a coupling capacitor?

Correct Answer
A.
It blocks direct current and passes alternating current.
B.
It blocks alternating current and passes direct current.
C.
It increases the resonant frequency of the circuit.
D.
It decreases the resonant frequency of the circuit.

320C6

What is the purpose of a coupling capacitor?

It blocks direct current and passes alternating current.

From wp2ahg:

A coupling capacitor connects two circuits. The capacitor allows only AC to pass, and DC is blocked.

See Wikipedia's article Capacitive coupling

Please see the Learning About Electronics site for the article What is a Coupling Capacitor?

YouTube Videos:

From Gaurav J - TheElectricalGuy channel, the video Introduction to Coupling capacitor (CC) | Video #10 2:42 minutes

From Simply Put channel, the video Decoupling Capacitors - Simply Put 17:58 minutes

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