Active Filter Question & Answers September 22, 2022 By WatElectronics This article lists 100 Active Filter MCQs for engineering students. All the Active Filter Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users preparing for their exams, interviews, or professionals who would like to brush up on their fundamentals on Active Filter. Electronic filters such as active filters are a class of analog type filters designed with passive components RLC and active components as an op-amp. The purpose of the op-amp in an active filter for measuring the accurate performance and predictability of the filter. Active filters are classified into 4 types: Butterworth, Chebyshev, Bessel, and Elliptical. Each of these filters is designed using RLC components and poses different characteristics according to the design and applied input. Active filters come with different configurations, such as Sallen-key, VCVC, state variable filter, dual amplifier bandpass, wien notch, multiple feedback filter, fliege, and Akerberg Mossberg configurations. HPF, LPF, BPF, and BSF are the transfer functions of active filters. Active filter benefits in terms of zero insertion loss, inter-stage isolation, zero harmonics, and zero loading time. But limits in terms of the complex based control system, complicated in handling large power and frequency limit range. The applications of active filters include feedback of phase, measurement circuits, and channel separation. 1). An active type filter is a ____ filter? Analogue Digital Electronic Both a and c None Hint 2). Which of the following are the components of an active filter? Resistor Capacitor Amplifier All the above None Hint Read more about Amplifiers. 3). Which of the following is the function of an amplifier in Active filter circuit? Increase the power Minimize noise Increase resistance All the above None Hint 4). Which of the following might be the input to amplifier? Voltage Current Resistance Both a and b None Hint 5). An amplifier has ___ number of port? 1 2 3 4 None Hint 6). Amplification of signal from amplifier is measured in terms of ___? Gain Ohms Amperes Volts None Hint 7). ___ is the ratio of output voltage to input voltage? Gain Bandwidth Peak Cut-off None Hint 8). Which of the following are the components of active filter in absence of bulk inductor? Poles Zeros Ones Both a and b None Hint 9). Which of the following characteristics of active filter can be adjusted with variable resistors? Q-point Response shape Tuned frequency All the above None Hint 10). A Q-factor is ____ parameter? Dimension Dimensionless Determinant Both b and c None Hint 11). A Q-factor describes ____ function of oscillator? Underdamped Damped Zero damped All the above None Hint 12). Which of the following are the configurations of Active filter? Wien notch Multiple feedback filters Fliege All the above None Hint 13). A sallen-key type topology of active filter is implemented with ____ order? 1st 2nd 3rd 4th None Hint 14). A sallen-key type topology of active filter is degenerated from ____ type of filter topology? Voltage-controlled Voltage source Current-controlled Current source Voltage-controlled Resistance source Current -controlled Voltage source None Hint 15). A VCVS has __ input impedance? 1 0 Infinite Constant None Hint 16). A VCVS has __ output impedance? 1 0 Infinite Constant None Hint 17). A VCVS is designed with ___ type of filters? 2-pole LPF HPF BPF All the above None Hint 18). Which of the following type of active filter consist of multiple integrator circuits? Wien notch Multiple feedback filters Fliege State variable None Hint 19). Which of the following are the applications of state variable type filter? Audio signal processing Video signal Image signal All the above None Hint 20). When value of Q of a state variable is low then its used in ___? Parametric equalizers Analog synthesizers Digital synthesizers All the above None Hint 21). When value of Q of a state variable is high then its used in ___? Parametric equalizers Analog synthesizers Digital synthesizers All the above None Hint 22). A biquad filter is a ____ response filter? Linear Non-linear Variable Both b and c None Hint 23. A biquad filter has ___ number of quadratic functions? 1 2 3 4 None Hint 24). A biquad filter is implemented using ____? Single amplifier biquad Two integrator loop topology Multi amplifier biquad Both a and b None Hint 25). A Single amplifier biquad type active filter generates ____? Complex zeros Complex poles Complex ones Both a and b None Hint Active Filter MCQs for Exams 26). A multiple feedback type topology is developed using ___ poles with transfer function? 2 3 4 5 None Hint 27). Which of the following is the low pass gain of a tow Thomas filter? G=-R2/R1 G=-R1/R2 G=R1*R2 G=R1 None Hint 28). Which of the following is the natural frequency of tow Thomas filter? Circuit w0=1/sqrt[R2R4C1C2] w0=1/sqrt[R2R4C2] w0=1/ [R2R4C1C2] w0=- [R2R4C1C2] None Hint 29). Which of the following is the low pass gain of a second order tow Thomas filter? Circuit 2 –R2/R1 –R1/R2 R2/R1 R1R2 None Hint 30). Which of the following is the band pass gain of second order tow Thomas filter? -R3/R1 -R2/R1 –R1/R3 R3/R1 None Hint 31). Which of the following is the bandwidth of a filter? wo/Q Q/w0 w0Q w0-Q None Hint 32). Which of the following is the formula of damping constant? 1/2Q 2Q 1-2Q 1+2Q None Hint 33). Which of the following are the characteristics of active filter? Good isolation High input impedance Low output impedance All the above None Hint 34). Which of the following are the advantages of active filter? Zero response issue Reliable operation Zero harmonics All the above None Hint 35). Which of the following are the disadvantages of active filter? Complex based control system Difficult in handling large power Frequency limit rage All the above None Hint 36). Which of the following are the applications of active filters? Feedback of phase Measurements circuits Channel separation All the above None Hint 37). A askerberg Mossberg topology type active filter uses ____ component? Differentiator Integrator Multiplier Adder None Hint 38). A sallen key design based active filter is a ______ polarity second order filter? Inverted Non-inverted Positive Both b and c None Hint 39). A sallen key design based active filter has ____ value of Q? High Low Zero Infinite None Hint 40). A sallen key design based active filter has ____ value of passband gain? High Low Zero Infinite None Hint 41). Identify the circuit displayed below. Circuit 3 Integrator Differentiator Adder Multiplier None Hint 42). Identify the circuit displayed below. Integrator Differentiator Adder Multiplier None Hint 43). Which of the following are the types of active filters? Butterworth Chebyshev Bessel All the above None Hint 44). A Chebyshev type active filter is also called ___? Equal ripple filter Half wave filter Full wave filter All the above None Hint 45). A Chebyshev type active filter has ___ cutoff value in pass band? Zero Sharp Variable Constant None Hint 46). The phase shift of Chebyshev type active filter at 1kHz, 5pole with 0.5dB is ___ at low frequency? 0 180 45 90 None Hint 47). The phase shift of Chebyshev type active filter at 1kHz, 5pole with 0.5dB is ___ at high frequency? 0 180 45 90 None Hint 48). Gain ripple is expressed in terms of ____? dB Hertz Farads Meters/seconds None Hint 49). Which of the following are the applications of Chebyshev type active filter? RF applications Voltage variable Current variable All the above None Hint 50). A Chebyshev type active filter are classified in to ___ number of types? 1 2 3 4 None Hint Active Filter MCQs for Students 51). A Chebyshev type active filter is a ___ filter? Analog Digital Both a and b None of the above None Hint 52). A type-1 Chebyshev type active filter has ___ parameter compared to Butterworth filter? High pass band ripple Stop band ripple Low pass band ripple Both b and c None Hint 53). A type-2 Chebyshev type active filter has ___ parameter compared to Butterworth filter? High pass band ripple Stop band ripple Low pass band ripple Both b and c None Hint 54). Which of the following is the main feature of Chebyshev type filter? High speed Performs convolution Uses Z-transformation All the above None Hint 55). Which of the following is the ripple value of type1 Chebyshev type filter? 20log10sqrt[1+e2] 20log10sqrt[1-e2] 20log10sqrt[e2] 20log10sqrt[1+e3] None Hint 56). Which of the following is the ‘e’ value of stop band attenuation of 5dB? 0.6801 0.5801 0.4801 0.3810 None Hint 57). Which of the following is the ‘e’ value of stop band attenuation of 10dB? 0.6801 0.5801 0.4801 0.333 None Hint 58). Which of the following is the formula of f0 in type1 Chebyshev type filter? w0/2π0 w/2 π0 c/ π0 π0/c None Hint 59). Which of the following is the units of frequency? Hertz Volts Amperes Farads None Hint 60). A Butterworth active type filter is also called ___? Flat filter Ripple filter Shaded filter Non-shaded filter None Hint 61). Which of the following are guaranteed from Butterworth active type filter? Flat type response in pass band High roll off Frequency response up to cut-off All the above None Hint 62). Which of the following is the Q value of Butterworth filter? 0.707 0.50 0.121 0.001 None Hint 63). Which of the following are the advantages of Butterworth filter? Smooth curves Zero ripples Good magnitude response All the above None Hint 64). Which of the following are the disadvantages of Butterworth filter? Induces phase shift Generates oscillations Depends on nature of noise All the above None Hint 65). Which of the following is the application of Butterworth filter? Audio processing Video processing Image processing All the above None Hint 66). A Butterworth filter has ____ phase response? Linear Non-linear Constant All the above None Hint 67). Amplitude in Butterworth filter is ___? Flat Curve Spike Rectangle None Hint 68). Which of the following active filter experiences propagation delay at input type frequency spectrum? Elliptical filter Bessel filter Chebyshev filter Butterworth filter None Hint 69). Which of the following is the application of Bessel filter? Audio crossover Vedio Image crossover All the above None Hint 70). Which of the following are the characteristics of Bessel filter? Maximum flat group based delay Zero overshoot Slow cut-off All the above None Hint 71). An elliptical type active filter has _____ bands? Stop band Pass band Mid band Both a and b None Hint 72). A filter that allows certain frequencies and blocks other frequencies outside the range is? Band pass filter Band stop filter Low pass filter High pass filter None Hint 73). Identify the type of active filter in the following figure. Circuit Band pass Band elimination Notch High pass None Hint 74). Identify the type of active filter in the following figure. Circuit Band pass Band elimination Notch High pass None Hint 75). Identify the type of active filter in the following figure. Circuit Band pass Band elimination Notch Low pass None Hint Active Filter MCQs for Quiz 76). Identify the type of active filter in the following figure. Circuit Band pass Band elimination Notch Low pass None Hint 77). At ___ value of Q the Band pass filter has narrow based passband? High Low Zero Constant None Hint 78). At ___ value of Q the Band pass filter has wide based passband? High Low Zero Constant None Hint 79). Which of the following are the applications of Band pass filter? Transmitters Neuroscience Atmospheric science All the above None Hint 80). An elliptical type filter is also called ____? Cauer filter Zolotarev filter Ripple filter Both a and b None Hint 81). Which of the following are the characteristics required for designing active filter? Frequency range Impedance Dynamic range All the above None Hint 82). Which of the following filter generates maximum roll-off rate? Legendre filter Gaussian filter Butterworth filter Chebyshev filter None Hint 83). Which of the following filter has zero overshoot in output when input is given? Legendre filter Gaussian filter Butterworth filter Chebyshev filter None Hint 84). Which of the following is the best example of BPF? RC circuit RL circuit CL circuit RLC circuit None Hint 85). A BPF is design using combination of ____ types of filter? LPF HPF Passive filter Both a and b None Hint 86). A BPF are of ___ types? 2 3 4 5 None Hint 87). A narrow BPF is also called _____? Multiple feedback filter Dual filter Multiple filter Both b and c None Hint 88). OP-amp in narrow BPF is operated in ____ mode? Inverted Non-inverted Positive Both b and c None Hint 89). Which of the following is the purpose of wide BPF? Sharp cutoff frequency value Sharp BW value Zero noise Both a and b None Hint 90). If the value of Q is low then the wave is ____? Over damped Under damped Zero damped All the above None Hint 91). If the value of Q is high then the wave is ____? Over damped Under damped Zero damped All the above None Hint 92). Which of the following are the signs of overdamped signal? Zero oscillation Impulse response Slower system All the above None Hint 93). Which of the following are the signs of underdamped signal? Oscillates few times Decrease in damping Infinite Q-factor All the above None Hint 94). A q-factor with intermediate vale is called ____? Over damped Under damped Zero damped Critical damping None Hint 95). Which of the following are the signs of critical damping? Zero oscillations Speed response Slow initial response All the above None Hint 96). A negative feedback is also called ______? Balancing feedback Unbalancing feedback Inverting feedback Both a and c None Hint 97). A negative feedback based devices are used in ____ fields? Mechanical Electronic Chemical Both a and b None Hint 98). Which of the following are the examples of negative feedback circuits? Mercury thermostats Servomechanisms Audio amplifiers All the above None Hint 99). Inverting terminal is a ____ polarity? Positive Negative Zero Both b and c None Hint 100). Non-inverting terminal is a ____ polarity? Positive Negative Zero Both b and c None Hint For More MCQs Matched Filter Question & Answers. Notch Filter/Band Reject Filter Question & Answers. Band Pass Filter Question & Answers. High Pass Filter Question & Answers. FIR Filter Question & Answers. 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