1. Which type of filter is designed to allow low frequencies to pass while attenuating high frequencies?
a) Low pass filter
b) High pass filter
c) Band pass filter
d) Band elimination filter
Answer: a) Low pass filter
Explanation: A low pass filter is designed to pass signals with frequencies lower than a certain cutoff frequency while attenuating frequencies higher than the cutoff frequency.
2. What is the defining characteristic of a high pass filter?
a) It allows high frequencies to pass
b) It attenuates low frequencies
c) It passes a range of frequencies
d) It eliminates a range of frequencies
Answer: b) It attenuates low frequencies
Explanation: A high pass filter is designed to allow high frequencies to pass while attenuating or blocking low frequencies.
3. Which filter type is effective for isolating a specific band of frequencies from a signal?
a) Low pass filter
b) High pass filter
c) Band pass filter
d) Band elimination filter
Answer: c) Band pass filter
Explanation: A band pass filter allows a specific range or band of frequencies to pass while attenuating frequencies outside that range.
4. In m-derived filters, what parameter controls the selectivity of the filter?
a) m-factor
b) Resistor value
c) Capacitor value
d) Inductor value
Answer: a) m-factor
Explanation: The m-factor in m-derived filters controls the selectivity or sharpness of the filter’s frequency response curve.
5. Which type of filter is formed by combining multiple individual filters to achieve desired characteristics?
a) Composite filter
b) Passive filter
c) Active filter
d) Resonant filter
Answer: a) Composite filter
Explanation: A composite filter is formed by combining multiple individual filters, such as low pass, high pass, and band pass filters, to achieve specific filtering characteristics.
6. What is a common objective of Butterworth, Chebyshev, and elliptic function approximations?
a) Maximizing passband ripple
b) Minimizing stopband attenuation
c) Achieving flat passband response
d) Creating non-linear frequency response
Answer: c) Achieving flat passband response
Explanation: Butterworth, Chebyshev, and elliptic function approximations are all aimed at achieving a flat passband response with different trade-offs in terms of ripple and stopband attenuation.
7. Which approximation method prioritizes minimizing the maximum passband ripple?
a) Butterworth approximation
b) Chebyshev approximation
c) Elliptic function approximation
d) Bessel approximation
Answer: a) Butterworth approximation
Explanation: Butterworth approximation prioritizes achieving a flat passband response with no ripple, thus minimizing the maximum passband ripple.
8. What is a characteristic of Chebyshev approximation compared to Butterworth approximation?
a) Chebyshev approximation has a flatter passband response
b) Chebyshev approximation has steeper rolloff
c) Chebyshev approximation has higher stopband attenuation
d) Chebyshev approximation has lower order
Answer: b) Chebyshev approximation has steeper rolloff
Explanation: Chebyshev approximation achieves steeper rolloff compared to Butterworth approximation by allowing some ripple in the passband.
9. Which filter approximation method offers the most flexibility in shaping the frequency response?
a) Butterworth approximation
b) Chebyshev approximation
c) Elliptic function approximation
d) Bessel approximation
Answer: c) Elliptic function approximation
Explanation: Elliptic function approximation offers the most flexibility in shaping the frequency response with the trade-off of increased complexity.
10. What technique involves transforming a filter’s frequency response from one type to another to meet specific requirements?
a) Frequency modulation
b) Impulse response transformation
c) Frequency transformation
d) Phase shifting
Answer: c) Frequency transformation
Explanation: Frequency transformation involves converting a filter’s frequency response from one type to another, such as from low pass to high pass or band pass, to meet desired specifications.