Key Topic 47: Filters Flashcards Preview

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Flashcards in Key Topic 47: Filters Deck (6)
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1
Q

3-47F1: A good crystal band-pass filter for a single-sideband phone would be?

A. 5 kHz.
B. 2.1 kHz.
C. 500 Hz.
D. 15 kHz.

A

B. 2.1 kHz.

2
Q

3-47F2: Which statement is true regarding the filter output characteristics shown in Figure 3F16?

A. C is a low pass curve and B is a band pass curve.
B. B is a high pass curve and D is a low pass curve.
C. A is a high pass curve and B is a low pass curve.
D. A is a low pass curve and D is a band stop curve.

A

D. A is a low pass curve and D is a band stop curve.

3
Q

3-47F3: What are the three general groupings of filters?

A. High-pass, low-pass, and band-pass.
B. Inductive, capacitive, and resistive.
C. Audio, radio, and capacitive.
D. Hartley, Colpitts, and Pierce.

A

A. High-pass, low-pass, and band-pass.

4
Q

3-47F4: What is an m-derived filter?

A. A filter whose input impedance varies widely over the design bandwidth.
B. A filter whose product of the series- and shunt-element inpedances is a constant for all frequencies.
C. A filter whose schematic shape is the letter “M”.
D. A filter that uses a trap to attenuate undesired frequencies too near cutoff for a constant-k filter.

A

D. A filter that uses a trap to attenuate undesired frequencies too near cutoff for a constant-k filter.

5
Q

3-47F5: What is an advantage of a constant-k filter?

A. It has high attenuation of signals at frequencies far removed from the pass band.
B. It can match impedances over a wide range of frequencies.
C. It uses elliptic functions.
D. The ratio of the cutoff frequency to the trap frequency can be varied.

A

A. It has high attenuation of signals at frequencies far removed from the pass band.

6
Q

3-47F6: What are the distinguishing features of a Butterworth filter?

A. A filter whose product of the series- and shunt-element impedances is a constant for all frequencies.
B. It only requires capacitors.
C. It has a maximally flat response over its passband.
D. It requires only inductors.

A

C. It has a maximally flat response over its passband.

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