Key Topic 47: Filters Flashcards
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.
B. 2.1 kHz.
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.
D. A is a low pass curve and D is a band stop curve.
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. High-pass, low-pass, and band-pass.
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.
D. A filter that uses a trap to attenuate undesired frequencies too near cutoff for a constant-k filter.
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. It has high attenuation of signals at frequencies far removed from the pass band.
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.
C. It has a maximally flat response over its passband.
