Active and Passive Filters – Exercise – 1

41. One important application of a state-variable ________ filter with a summing amplifier is to minimize the 60 Hz “hum” in audio systems.

(a) low-pass
(b) high-pass
(c) band-pass
(d) band-stop

Answer
Answer : (d)
Explanation
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42. Filters with the ________ characteristic are used for filtering pulse waveforms.

(a) Butterworth
(b) Chebyshev
(c) Bessel
(d) Neither Chebyshev nor Bessel

Answer
Answer : (c)
Explanation
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43. Filters with the ________ characteristic provide a very flat amplitude in the passband and a roll-off rate of –20 dB/decade/pole.

(a) Butterworth
(b) Chebyshev
(c) Bessel
(d) Either Chebyshev or Bessel

Answer
Answer : (a)
Explanation
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44. A ________ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.

(a) low-pass
(b) high-pass
(c) band-pass
(d) band-stop

Answer
Answer : (c)
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45. In a series resonant band-pass filter, a lower value of Q results in ________.

(a) a higher resonant frequency
(b) a smaller bandwidth
(c) a higher impedance
(d) a larger bandwidth

Answer
Answer : (d)
Explanation
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