Electrical Filter mcq questions answers part1

Q1. The type of filter which passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band
(A) low-pass filter
(B) high-pass filter
(C) band-pass filter
(D) band-stop filter

Q2. A third-order filter will have a roll off rate of
(A) 20 dB/decade
(B) 40 dB/decade
(C) 60 dB/decade
(D) 30 dB/decade

Q3. What is correct about the ripple factor of LC filter?
(A) Increases with the load current
(B) increases with the load resistance
(C) remains constant with the load current
(D) has the lowest value

Q4. The use of a capacitor filter in a rectifier circui
(A) Load current is high
(B) Load current is low
(C) Load voltage is high
(D) Load voltage is low

Q5. The basic purpose of filter at the output of a rectifier is to
(A) minimize variations in ac input signal
(B) suppress harmonics in rectified output
(C) remove ripples from the rectified output
(D) stabilize dc output voltage

Q6. Which of the following type of filters has maximum flat response?
(A) Bessel
(B) Butterworth
(C) Chebyshev
(D) all of the above

Q7. Which filter exhibits the most rapid roll off rate?
(A) Bessel
(B) Butterworth
(C) Chebyshev
(D) all of the above

Q8. Filters with which of the following characteristic provide a very flat amplitude in the pass band and a roll off rate of 20 dB/decade/pole
(A) Butterworth
(B) Chebyshev
(C) Bessel
(D) None of these

Q9. The critical frequency is the frequency at which the response drops from the passband by
(A) 20 dB
(B) 3 dB
(C) 6 dB
(D) 40 dB

Q10. In band elimination filter, the frequency of resonance of individual arms is
(A) Geometric mean of two cut-off frequencies
(B) Geometric difference of two cut-off frequencies
(C) Geometric product of two cut-off frequencies
(D) Geometric division of two cut-off frequencies

Q11. Which of the following type of filters exhibits a linear phase characteristic?
(A) Bessel
(B) Butterworth
(C) Chebyshev
(D) all of the above

Q12. For filtering pulse waveforms, the filters with which of the following characteristic is used?
(A) Butterworth
(B) Chebyshev
(C) Bessel
(D) All of these

Q13. Which of the following type of filters has a bandwidth same as the critical frequency?
(A) low-pass
(B) high-pass
(C) band-pass
(D) band-stop

Q14. Which of the following filter characteristic are useful when a rapid roll-off is required.
(A) Butterworth
(B) Chebyshev
(C) Bessel
(D) All of these

Q15. Which of the following type of filters rejects all frequencies within a specified band and passes all those outside this band?
(A) low-pass
(B) high-pass
(C) band-pass
(D) band-stop

Q16. In a certain low-pass filter, fc = 4.5 kHz. Its pass band is
(A) 0 Hz
(B) 0 Hz to 4.5 kHz
(C) 9 kHz
(D) 4.5 kHz

Q17. In a certain parallel resonant band-pass filter, the resonant frequency is 10 kHz. If the bandwidth is 4 kHz, the higher frequency
(A) 10 kHz
(B) 7 kHz
(C) 12 kHz
(D) Data insufficient

Q18. In a series resonant band-pass filter, a lower value of Q results in
(A) higher resonant frequency
(B) higher impedance
(C) smaller bandwidth
(D) larger bandwidth

Q19. m-derived filter drawback can be overcome by connecting number of sections in addition to prototype and m-derived sections with terminating
(A) One-fourth sections
(B) Half sections
(C) Square of three-fourth sections
(D) Full sections

Q20. What is the ideal value of attenuation for the frequencies in pass band especially for a cascade configuration?
(A) Zero
(B) Unity
(C) Infinity
(D) Negative