Positive Feedback Amplifier Question & AnswersMay 2, 2022 By WatElectronics This article lists 75 Positive Feedback Amplifier MCQs for engineering students. All the Positive Feedback Amplifier Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on their fundamentals on Positive Feedback Amplifier.The feedback system is a circuit in which the output signal is sampled and feedback to the input to form an error signal for driving the system. Feedback systems are used in oscillators, timing circuits as well as other types of electronic circuits. Basic feedback systems are classified as sensing, controlling, and actuating. Mainly exists two types of feedback: Negative feedback and Positive feedback. Positive feedback or a Regenerative amplifier increases the system gain and the possibility of instability may lead to self-oscillation.The overall gain with positive feedback applied will be greater than the gain without feedback. An increase in the system gain would give rise to oscillatory circuit responses, as it increases the effect of the input signal due to magnitude. A positive feedback amplifier can also be an electronic amplifier, based on Op-amplifier. Positive feedback control is obtained by applying an output signal back to the non-inverting terminal via a feedback resistor.1). A network in which, the output is fed back to the input of second circuit is called______. Feedback Inverting Summing Amplification HintResponse is obtained.2). Feedback circuits are classified as _____ types? Three One Two Four HintDual role.3). Positive feedback is a______ feedback. Degenerative Indirect Regenerative Negative HintCan be used again and again.4). When the feedback signal is in phase with the input signal then the amplifier is known as_____. Degenerative Indirect Negative feedback Positive feedback HintProductive response.5). Because of increased gain, ______ parameter also increases in a positive fed-back circuit. Distortion Summing Regeneration Degeneration HintDeformation of signa mean?6). Positive feedback is deployed in _______. Analyzers Oscillators Decoders Timers HintWaveguide.7). How many types of feedback connections exists in amplifier? 2 3 4 5 HintQuadruple. Read more about Differential Amplifier8). Which of the following metrics can be fed back to input using a series connection. Current Voltage Capacitance Both a and b Hint2 metrics.9). _________ and Current series are series type feedback connections. Voltage series feedback Current series feedback Voltage shunt feedback Current shunt feedback HintPotential difference in side by side.10). _________ and Current shunt feedback are shunt type feedback connections. Voltage series feedback Current series feedback Voltage shunt feedback Current shunt feedback HintPotential difference in parallel.11). _______ feedback generally increases input impedance. Shunt Series Hybrid None of the above HintOutput of other component is given as input to next component.12) _______ feedback generally decreases input impedance. Shunt Series Hybrid None of the above HintParallel connection mean.13)._______ feedback generally increases output impedance. Voltage Current Series Shunt HintBoth the parameters are inversely proportional.14). _______ feedback generally decreases output impedance. Voltage Current Series Shunt HintPotential difference.15)._______ amplifiers require high input and low output impedances. Feedback Multistage Operational Negative HintHas more than one stages.16). When there is no feedback then the voltage gain is known as______. High gain Low gain Internal gain External gain HintZero feedback circuit.17). Voltage gain is represented by _____? A V B C Hint"Alpha “ first alphabet".18). Voltage gain of positive feedback circuit formula is, A=______? A=V_O/V_S A=〖1+V〗_O/V_S A=V_O/〖2V〗_S A=〖V2〗_O/V_S HintRatio of terms.19). In positive feedback amplifiers, gain stability is________ with increase in applied input? Increases Decreases Constant Null HintInversely proportional.20). Bandwidth will be ______ in positive feedback amplifiers. Increases Decreases Constant Null HintNarrow.21). V_O is defined as______? Output voltage Input voltage Constant voltage None of the above HintAlso know as production potential difference.22). Where as V_S is defined as______? Output voltage Signal voltage Constant voltage None of the above HintApplied voltage.23). Feedback circuit is represented by_____? α δ β µ Hintvoiced bilabial fricative24). Feedback signal and input signal has a phase shift of________ in a PFA. 0^0 〖180〗^0 〖90〗^0 〖360〗^0 Hint90+90.25)._______ resultant phase shift, will be finally in phase with the input signal in a PFA.. 0^0 〖180〗^0 〖90〗^0 〖360〗^0 Hint270+90=?Positive Feedback Amplifier Quiz Questions and Answers.26). Feedback ratio is also known as _______. Feedback amplifier Feedback fraction Feedback gain None of the above HintRatio of terms.27). Feedback ratio is represented by______. µ β δ α HintRepresents Beta.28). Feedback ratio formula, β=_______? V_f/V_0 1+V_f/V_0 V_f V_0 V_0/V_f HintFeedback potential difference to the output voltage.29). Gain of the amplifier with feedback , A_f=________? A/(1+Aβ). A(1+Aβ). (1+Aβ). (1+Aβ)/A HintTransfer gain to the feedback gain.30). Example of positive feedback will be______? Feedback amplifier Electronic amplifier Negative amplifier Wavelet HintAuto electronic.31). V_out of an Op-amp is applied to the non-inverting input terminal via, ______? V_f R_f I_f L_f HintFeedback resistance.32). As Op-amp amplifies positive input signal, then the output becomes more______. Null Negative Positive Infinity HintNon-inverted polarity value.33). Output becomes _______ at positive supply rail. Non-saturation Saturated Mono saturated Poly saturated HintDrenched one.34). If loop gain is positive, then the transfer function A will be_______. G/1-GH G/1+GH 1+GH/G 1-GH/G HintGain to the difference of transfer gain.35). If GH=1, the system gain A_Vwill be_______? Increase Decrease Null Infinity HintImmensity.36). Positive feedback amplifiers are used in _______ type of circuits. Unilateral Bilateral Active Timing HintScheduled circuits.37). Possibility of instability leads to ______? Forced oscillation Self oscillation Resonance None of the above HintOperates on own.38). Series shunt configuration is a ________? Current Controlled Voltage Source Voltage Controlled Current Source Current Controlled Current Source Voltage Controlled Voltage Source HintPotentially controlled potential difference origin. Read more about Voltage Regulator39). Shunt-Shunt Configuration is a_____________? Current Controlled Voltage Source Voltage Controlled Current Source Current Controlled Current Source Voltage Controlled Voltage Source HintPresently controlled potential difference origin.40). Series-Series Configuration is a __________? Current Controlled Voltage Source Voltage Controlled Current Source Current Controlled Current Source Voltage Controlled Voltage Source HintExpressed in volts, amperes.41). Shunt-Series Configuration is a __________? Current Controlled Voltage Source Voltage Controlled Current Source Current Controlled Current Source Voltage Controlled Voltage Source HintExpressed in ampers.42). Inverting and non- inverting Op-amp circuits operate with series-shunt feedback producing is known as______? Voltage amplifier Current amplifier Negative feedback amplifier Positive feedback amplifier HintPotential difference amp.43). Transfer gain of series-shunt feedback configuration A_(V ) is __________? V_in / V_out V_out / V_in V_out V_in 〖1+V〗_in / V_out HintOutput voltage to input voltage.44). Shunt series feedback is known as _______ feedback. Series current Shunt voltage Series voltage Shunt current HintParallel current response.45). Feedback signal is _______ to the output current flowing in the load. Inversely proportional Proportional Related None of the above HintInput follows output.46). In shunt-series feedback, the feedback signal is fed-back in _______ with the input. Series Parallel Hybrid None of the above HintLow current flows.47). Shunt-series feedback configuration is also known as ______ amplifier? Voltage Current Resistance None Of The Above HintPresent amp.48). Transfer function A_iof Shunt series configuration is _________? I_in / I_out -I_out / I_in I_out I_in 〖1+I〗_in / I_out HintRatio of terms.49). Units of Shunt-series feedback is ____________? Voltage/Amperes Amperes/Amperes Amperes/Voltage Voltage/Voltage HintElectric current to the current50). Units of Series-shunt feedback system is_____? Volts/Amperes Amperes/Amperes Amperes/Volts Volts/Volts HintPotential to the potential difference.Positive Feedback Amplifier Interview Questions and Answers51). In Shunt-series feedback system, the series connection at the output _______ , output resistance R_out. Decreases Increases Infinity Constant HintLess current flow.52). In Shunt-series feedback system, the shunt connection at the input _______, the input resistance R_in. Decreases Increases Infinity Constant HintMore current flow.53). In Shunt-series feedback system, input signal is _____? Current Voltage Inductance Resistance HintAmperes.54). In series-series feedback system, configuration is defined as ________current to the input voltage. Output Input Inverting Non-inverting HintProduction.55). Series-series feedback system works as a ____________ amplifier. Voltage Current Trans conductance Trans resistance HintMeasured in siemens.56). Trans conductance is represented by_____? I_m V_m G_m None of the above Hint“Gamma” first alphabet.57). Transfer gain of series-series feedback circuit G_m is_____? V_in / I_out I_out / V_in I_out V_in None of the above HintCurrent out to input volt.58). In Series-series feedback configuration input signal is ______? Voltage Current Trans conductance Trans resistance HintPotential difference.59). In Series-series feedback configuration output signal is__________? Voltage Current Trans conductance Trans resistance HintAmperes.60). The ideal output resistance is very ____in series-series feedback. Low Null High Infinity HintZero current flow.61). Shunt connection in shunt-series feedback ________ the input resistance. Increases Decreases Inverting Constant HintMore current flow.Positive Feedback Amplifier MCQs for Exams62). Shunt-shunt feedback systems also known as ________? Shunt-series feedback Shunt-voltage feedback Series voltage feedback Series current feedback HintParallel potential difference.63). Shunt-shunt feedback systems operates as a ________ feedback system? Voltage-current controlled Current-voltage controlled Voltage-voltage controlled Current-current controlled HintPresent flow potential difference64). Transfer gain of shunt-shunt feedback circuit R_m is_____? V_out / I_in I_out / V_in I_out V_in None of the above HintOutput volt to input present flow.65). Shunt voltage configuration works as ______________type. Trans conductance Trans resistance Conductance Amplifier HintInverse of trans conductance.66). Ideal input resistance of shunt-shunt feedback system then Rin will be ________? Large Small Constant Null HintMore current flows.67). In shunt-shunt feedback system, the output _________ is fed back as a current to current driven-port. Inductance Current Voltage Amplifier HintPotential difference.68). As ideal input resistance is very small, then the ideal output resistance will also be___? Large Small Constant Null HintMore current flow.69).Shunt connections at both input and output terminals reduce the ______impedance. Output Inverting Non-inverting Amplifier HintLoad is connected to which end of a circuit?70). Feedback output signal is sampled and fed back to input to form _____ signal. Input Output Error Source HintInaccuracy.71). Degenerative feedback reduce _________ property. System gain Bandwidth Timing Clock pulse HintThe “output signal divided by the input signal”.72). Negative feedback system is used to improve _____ systems stability. Control Impedance Resistance Susceptance HintOutput depends on provided input.73). Processing of feedback systems ranges from simple to ________ circuits. Simple Complex Easy Infinite HintMany components exists.74). Feedback circuit characteristics can be independent of _______? Frequency Operating conditions Wavelength Source HintWorking situations.75). Complex digital feedback systems are formed using_____? ICs Transistors Resistors Controllers HintDIP is a ___? Read more about Difference between IC and Electronic Devices.. Please fill in the comment box below. Time is Up! Time's up
