**1. **A band pass filter is one which

**2.** A 10 kHz even-symmetric square wave is passed through a bandpass filter with the center frequency at 30 kHz and a 3 dB passband of 6 kHz. The filter output is

1. Which filter attenuates any frequency outside the passband?

A. Band-pass filter

B. Band-reject filter

C. Band-stop filter

D. All of the mentioned

2. Narrow band-pass filters are defined as

A. Q < 10

B. Q = 10

C. Q > 10

D. None of the mentioned

3. A band-pass filter has a bandwidth of 250Hz and a center frequency of 866Hz. Find the quality factor of the filter?

A. 3.46

B. 6.42

C. 4.84

D. None of the mentioned

4. Find the center frequency of wide band-pass filter

A. f_{c}= √(f_{h} ×f_{L})

B. f_{c}= √(f_{h} +f_{L})

C. f_{c}= √(f_{h} -f_{L})

D. f_{c}= √(f_{h} /f_{L})

5. Find out the voltage gain magnitude equation for the wide band-pass filter.

A. A_{Ft}×( f/f_{L})/√[(1+(f/f_{h})^{2}]×[1+(f/f_{L})^{2}].

B. A_{Ft}/ √{[1+(f/f_{h})^{2}]×[1+(f/f_{L})^{2}]}

C. A_{Ft}/ √{[1+(f/f_{h})^{2}]/[1+(f/f_{L})^{2}]}

D. [A_{Ft}/(f/f_{L})]/ √{[1+(f/f_{h})^{2}]/[1+(f/f_{L})^{2}]}

6. When a second-order high pass filter and second-order low pass sections are cascaded, the resultant filter is a

A. ±80dB/decade band-pass filter

B. ±40dB/decade band-pass filter

C. ±20dB/ decade band-pass filter

D. None of the mentioned

7. Find the voltage gain magnitude of the wide band-pass filter?

Where total passband gain is=6, input frequency = 750Hz, Low cut-off frequency =200Hz and high cut-off frequency=1khz.

A. 13.36 dB

B. 12.25 dB

C. 11.71 dB

C. 14.837dB

8. Compute the quality factor of the wide band-pass filter with high and low cut-off frequencies equal to 950Hz and 250Hz.

A. 0.278

B. 0.348

C. 0.696

D. 0.994

9. The details of low pass filter sections are given as f_{h} =10kHz, A_{F}= 2, and f=1.2kHz. Find the voltage gain magnitude of the first-order wide band-pass filter, if the voltage gain magnitude of the high pass filter section is 8.32dB.

A. 48.13dB

B. 10.02dB

C. 14.28dB

D. 65.99dB

Answer: C

10. The quality factor of a wide band-pass filter can be

A. 12.6

B. 9.1

C. 14.2

D. 10.9

12. If the gain at center frequency is 10, find the quality factor of the narrow band-pass filter

A. 1

B. 2

C. 3

D. None of the mentioned

13. The advantage of a narrow band-pass filter is

A. f_{c} can be changed without changing gain

B. f_{c} can be changed without changing bandwidth

C. f_{c} can be changed without changing resistors

D. All of the mentioned