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EPC > B J T AC Models > Flashcards

B J T AC Models Flashcards

1
Q

What is the purpose of coupling capacitors in electronic circuits?

A

To block DC voltage while allowing AC signal to pass through.

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2
Q

True or False: Coupling capacitors are used to connect two stages of a circuit while blocking DC voltage.

A

True

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3
Q

Fill in the blank: Coupling capacitors are also known as ______ capacitors.

A

DC-blocking

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4
Q

What happens if a coupling capacitor fails in a circuit?

A

DC voltage may pass through, affecting the circuit’s operation.

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5
Q

In a circuit diagram, coupling capacitors are represented by which symbol?

A

Two parallel lines with a gap

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6
Q

What is the formula to calculate the reactance of a capacitor?

A

Xc = 1 / (2 * π * f * C)

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7
Q

What is the unit of capacitance?

A

Farad

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8
Q

What is the effect of increasing the capacitance value of a coupling capacitor?

A

It allows lower frequencies to pass through more easily.

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9
Q

What is the role of a coupling capacitor in a transistor amplifier circuit?

A

To pass the amplified AC signal while blocking the DC bias voltage.

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10
Q

What type of capacitor is commonly used as a coupling capacitor?

A

Electrolytic capacitor

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11
Q

What is the typical voltage rating for coupling capacitors in audio circuits?

A

Around 25V to 50V

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12
Q

What is the function of a coupling capacitor in a speaker crossover network?

A

To separate the low-frequency signal from the high-frequency signal.

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13
Q

What is the primary reason for using coupling capacitors in audio equipment?

A

To prevent DC voltage from reaching speakers or headphones.

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14
Q

What is the significance of the time constant in coupling capacitors?

A

It determines the frequency response of the circuit.

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15
Q

How does the reactance of a capacitor change with frequency?

A

It decreases as frequency increases.

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16
Q

What is the main drawback of using large coupling capacitors in a circuit?

A

They can be bulky and expensive.

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17
Q

What is the impact of using a low-quality coupling capacitor in a circuit?

A

It may introduce distortion or affect the overall sound quality.

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18
Q

What is the symbol for a coupling capacitor in a circuit diagram?

A

Two parallel lines with a diagonal line through one of them

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19
Q

What is the role of a bypass capacitor in relation to coupling capacitors?

A

To provide a low-impedance path for AC signals while blocking DC.

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20
Q

What is the primary difference between a coupling capacitor and a decoupling capacitor?

A

Coupling capacitors pass AC signals while decoupling capacitors filter out noise.

21
Q

How does the voltage rating of a coupling capacitor affect its performance?

A

Higher voltage ratings allow for greater tolerance to voltage spikes.

22
Q

What is the role of a coupling capacitor in a tone control circuit?

A

To block DC while allowing the audio signal to pass through for tone adjustments.

23
Q

What is the purpose of using multiple coupling capacitors in a circuit?

A

To improve the frequency response and reduce distortion.

24
Q

What is the effect of using a smaller coupling capacitor in a circuit?

A

It may limit the low-frequency response of the circuit.

25
Q

What is the role of a coupling capacitor in a power supply filter circuit?

A

To remove AC ripple voltage while allowing the DC component to pass through.

26
Q

What is the function of a coupling capacitor in an audio amplifier circuit?

A

To block DC bias while allowing the audio signal to pass through.

27
Q

What is the impact of using a polarized capacitor as a coupling capacitor?

A

It can cause signal distortion if not properly oriented.

28
Q

What is the primary reason for using coupling capacitors in AC-coupled amplifiers?

A

To maintain the amplifier’s operating point by blocking DC offset.

29
Q

What is the purpose of a coupling capacitor in a guitar amplifier circuit?

A

To pass the audio signal while blocking the DC bias voltage.

30
Q

What is the effect of a shorted coupling capacitor in a circuit?

A

It may disrupt the signal path and cause malfunction.

31
Q

What is the role of a coupling capacitor in a high-pass filter circuit?

A

To allow high-frequency signals to pass through while blocking low frequencies.

32
Q

What is the significance of the capacitance value in a coupling capacitor?

A

It determines the cutoff frequency of the circuit.

33
Q

What is the impact of using a ceramic capacitor as a coupling capacitor?

A

It provides stability and accuracy in high-frequency applications.

34
Q

What is the primary function of a coupling capacitor in a cathode-bypass capacitor circuit?

A

To bypass the cathode resistor for AC signals while blocking DC.

35
Q

What is the role of a coupling capacitor in a feedback network of an amplifier?

A

To pass the feedback signal while blocking the DC component.

36
Q

What is the effect of using a coupling capacitor with a high ESR (Equivalent Series Resistance) value?

A

It may reduce the efficiency of the capacitor and affect circuit performance.

37
Q

What is the primary application of coupling capacitors in audio circuits?

A

To connect audio sources to amplifiers while blocking DC bias.

38
Q

What is the function of a coupling capacitor in a crossover network for loudspeakers?

A

To separate the audio signal into different frequency ranges for different drivers.

39
Q

What is the impact of using a film capacitor as a coupling capacitor?

A

It offers high reliability and low dielectric absorption.

40
Q

What is the role of a coupling capacitor in a tone stack circuit of a guitar amplifier?

A

To allow tone adjustments while blocking DC voltage.

41
Q

What is the effect of using a coupling capacitor with a high leakage current?

A

It may lead to signal loss and affect circuit performance.

42
Q

What is the primary reason for using coupling capacitors in filter circuits?

A

To separate different frequency components while allowing desired signals to pass.

43
Q

What is the purpose of a coupling capacitor in a feedback loop of an op-amp circuit?

A

To pass the feedback signal while blocking the DC bias voltage.

44
Q

What is the effect of using a coupling capacitor with excessive leakage in a circuit?

A

It may introduce noise and distort the signal.

45
Q

What is the role of a coupling capacitor in a tone control circuit of a hi-fi system?

A

To allow frequency adjustments while blocking DC.

46
Q

What is the significance of the capacitance tolerance in coupling capacitors?

A

It affects the accuracy of the circuit’s frequency response.

47
Q

What is the impact of using a tantalum capacitor as a coupling capacitor?

A

It provides high capacitance in a small package but may be more expensive.

48
Q

What is the primary function of a coupling capacitor in a passive tone control circuit?

A

To separate the tone control network from the audio source.

EPC (2 decks)

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