Operational Amplifier Question & AnswersSeptember 1, 2021 By Wat Electrical Leave a Comment This article lists 100 Operational Amplifier MCQs for engineering students. All the Operational Amplifier Questions & Answers given below includes solution and link wherever possible to the relevant topic.The basic task of the operational amplifier is to amplify the input signal. In the early days when digital computers were not evolved at that time the different mathematical functions like integration, subtraction, addition, and differentiation were performed using the operational amplifier.So, just by connecting a few resistors and capacitors, it is possible to perform the different mathematical operations, that is why this amplifier is known as the operational amplifier. Most of the amplifiers consist of two power supplies the positive and the negative power supply. 1). How many input terminals does an operational amplifier have?OneTwoFourThreeHintAn operational amplifier has two input terminals they are inverting and non-inverting terminals 2). If the input terminal of an op-amp is positive then that terminal is known as ____________InvertingNon-invertingBoth a and bNone of the aboveHintIf the input terminal of an op-amp is positive then that terminal is known as a non-inverting terminal 3). The operational amplifiers are used in __________Waveform converterOscillatorActive filtersAll of the aboveHintThe operational amplifiers are used in waveform converter, oscillator, active filters, etc 4). The ideal operational amplifiers slew rate should be equal to _______OneZeroInfinityNone of the aboveHintThe ideal operational amplifiers slew rate should be equal to infinity 5). If the input terminal of an op-amp is negative then that terminal is known as ____________InvertingNon-invertingBoth a and bNone of the aboveHintIf the input terminal of an op-amp is negative then that terminal is known as inverting terminal 6). How many output terminals does an operational amplifier have?OneTwoFourThreeHintAn operational amplifier has only one output terminal 7). What is the standard form of CMRR?Common Module Rejection RatioCommon Mode Rejection RatioComplex Mode Rejection RatioNone of the aboveHintThe standard form of CMRR is Common Mode Rejection Ratio 8). For an ideal op-amp, the value of the common-mode rejection ratio should be equal to _______OneZeroInfinityNone of the aboveHintFor an ideal op-amp, the value of the common-mode rejection ratio should be equal to infinity 9). Common mode rejection ratio is defined as a ratio of _________Differential gain/common modeDifferential gain-common modeDifferential gain*common modeNone of the aboveHintCommon mode rejection ratio is defined as a ratio of differential gain/common mode 10). The ideal op-amp has _______Open-loop gain is InfiniteZero output impedance, the input impedance is infiniteSlew rate and infinite bandwidthAll of the aboveHintThe input impedance, open-loop gain, and the bandwidth in ideal operational amplifiers is infinite and it has zero output impedance and slew rate 11). Whenever the input is equal to zero in an ideal op-amp then at that time the output is equal to ________OneZeroInfinityNone of the aboveHintWhenever the input is equal to zero in an ideal op-amp then at that time the output is equal to zero 12). The input impedance value of an op-amp 741 is _____________2MΩ4MΩ5MΩ7MΩHintThe input impedance value of an op-amp 741 is 2MΩ 13). The output impedance value of an op-amp 741 is _________2MΩ4MΩ75MΩ7MΩHintThe output impedance value of an op-amp 741 is 75MΩ 14). The feedback from output to the non-inverting input terminal is known as ___________Positive feedbackNegative feedbackBoth a and bNone of the aboveHintThe feedback from output to the non-inverting input terminal is known as positive feedback 15). The offset voltage value of an ideal op-amp 741 is _________1mV2mV5mV4mVHintThe offset voltage value of an ideal op-amp 741 is 1mV 16). In how many ways we can apply input to an op-amp?OneTwoThreeFourHintIn three ways we can apply input to an op-amp, by applying an input to both the Inverting & non-inverting terminals, only to inverting, and to the only non-inverting terminal 17). For general purpose op-amps, the value of the input bias current is in the range of ______Nano- amperesMicro- amperesFemto-amperesAll of the aboveHintFor general purpose op-amps, the value of the input bias current is in the range of nano amperes, microamperes, and femto-amperes, but for high-speed op-amps, the range is micro amperes & Femto amperes for precise amplifiers 18). The CMRR value of an ideal op-amp 741 is _______70-100dB70-80dB70-90dB70-110dBHintThe CMRR value of an ideal op-amp 741 is 70-90dB 19). The input bias current value of the LT6273 op-amp is in the range of ____Nano- amperesMicro- amperesFemto-amperesNone of the aboveHintThe input bias current value of the LT6273 op-amp is in the range of micro- amperes 20). The input bias current value of the LM741 op-amp is in the range of ____Nano- amperesMicro- amperesFemto-amperesNone of the aboveHintThe input bias current value of the LM741 op-amp is in the range of nano-amperes 21). The input bias current value of the AD549 op-amp is in the range of ____Nano- amperesMicro- amperesFemto-amperesNone of the aboveHintThe input bias value of the AD549 op-amp is in the range of femto-amperes 22). The slew rate value of an ideal op-amp 741 is _______7.0V/µs0.5V/µs1V/µs0.2V/µsHintThe slew rate value of an ideal op-amp 741 is 0.5V/µs 23). An op-amp is a _______Multistage amplifierHigh gain differential amplifierPerforms mathematical operationsAll of the aboveHintAn op-amp is a multistage amplifier, high gain differential amplifier, and performs mathematical operations 24). An operational amplifiers are categorized into ______OneTwoThreeFourHintAn operational amplifiers are categorized into two types they are open loop and close loop op-amps 25). The feedback is provided in ____ op-ampOpen-loopClose loopBoth a and bNone of the aboveHintThe feedback is provided in close loop op-ampOperational Amplifiers MCQs for Interviews 26). The slew rate value of an ideal op-amp LF411 is _______7.0V/µs0.5V/µs15V/µs0.2V/µsHintThe slew rate value of an ideal op-amp LF411is 15V/µs 27). How many types of feedbacks are there in close loop op-amp?OneTwoThreeFourHintThere are two types of feedbacks are there in close loop op-amp they are positive and negative feedback 28). __________ is an op-amp attributeZero impedanceZero bias currentZero offset voltageNone of the aboveHintZero impedance is an op-amp attribute 29). ___________ are the op-amp input attributesInfinite impedanceZero bias currentRespond to differential voltagesAll of the aboveHintInfinite impedance, zero bias current, and response to differential voltages are the op-amp input attributes 30). _______ are the ideal op-amp attributesZero common-mode gainZero bias currentZero offset voltageAll of the aboveHintzero common-mode gain, zero bias current, and zero offset voltage are the ideal op-amp attributes 31). The slew rate value of an op-amp LM318 is _______70V/µs0.5V/µs15V/µs0.2V/µsHintThe slew rate value of an op-amp LM318 is 70V/µs 32). How many pins does an op-amp 741 IC have?FourteenTwoEightFourHintAn op-amp 741 IC has eight pins 33). The input resistance value of an op-amp 741 IC is _______1MΩ to 3MΩ1MΩ to 2MΩ1MΩ to 4MΩ1MΩ to 5MΩHintThe input resistance value of an op-amp 741 IC is 1MΩ to 2MΩ 34). The offset voltage of an op-amp 741 is _________<3mV<4mV<50mV<10mVHintThe offset voltage of an op-amp 741 is <10mV 35). The offset current of an op-amp 741 is _________1nA2nA10nA5nAHintThe offset current of an op-amp 741 is 10nA 36). The slew rate value of an op-amp LM6364 is _______300V/µs0.5V/µs15V/µs0.2V/µsHintThe slew rate value of an op-amp LM6364 is 300V/µs 37). The output resistance value of an op-amp 741 IC is ________50Ω to 60Ω50Ω to 70Ω50Ω to 80Ω50Ω to 100ΩHintThe output resistance value of an op-amp 741 IC is 50Ω to 100Ω 38). The average of two currents that flow into inverting and non-inverting terminals of an op-amp is known as input __________Bias currentOffset currentOffset voltageAll of the aboveHintThe average of two currents that flow into inverting and non-inverting terminals of an op-amp is known as input bias current 39). The algebraic difference between the currents into an inverting and non-inverting terminal is known as _______Input bias currentInput offset currentInput offset voltageNone of the aboveHintThe algebraic difference between the currents into inverting and non-inverting terminals is known as input offset current 40). In the feedback amplifier the negative feedback exit in how many ways?OneTwoThreeFourHintIn feedback amplifier the negative feedback exit in four ways such as VCVS, ICVS, VCIS, and ICIS 41). The voltage-controlled voltage source is also known as ____________Voltage amplifierTransresistance amplifierTransconductance amplifierCurrent amplifierHintThe voltage-controlled voltage source is also known as a voltage amplifier 42). ________ is an input in current-controlled voltage source amplifierCurrentVoltageBoth a and bNone of the aboveHintCurrent is input in current-controlled voltage source amplifier 43). A circuit that amplifies the difference between two signals is called ______ amplifierDifferentialInvertingNon-invertingNone of the aboveHintA circuit that amplifies the difference between two signals is called the differential amplifier 44). ________ is a circuit that compares two input voltagesIntegratorComparatorDifferentiatorNone of the aboveHintComparator is a circuit that compares two input voltages 45). A circuit that performs integration of input signals is known as _________IntegratorComparatorDifferentiatorNone of the aboveHintA circuit that performs the integration of input signals is known as an integrator 46). ________ is an output in a current-controlled voltage source amplifierCurrentVoltageBoth a and bNone of the aboveHintVoltage is an output in a current-controlled voltage source amplifier 47). The current-controlled voltage source amplifier is also known as ________Voltage amplifierTransresistance amplifierTransconductance amplifierCurrent amplifierHintThe current-controlled voltage source amplifier is also known as a trans-resistance amplifier 48). A circuit that performs mathematical differentiation of an input signal is called a ________IntegratorComparatorDifferentiatorNone of the aboveHintA circuit that performs mathematical differentiation of an input signal is called a differentiator 49). When two input voltages are equal then the output of an op-amp should be equal to ________OneZeroInfinityNone of the aboveHintWhen two input voltages are equal then the output of an op-amp should be equal to zero 50). An op-amp MAX4238 IC is _________Gain is highBandwidth is highNoise is lowAll of the aboveHintIn an op-amp MAX4238 IC the bandwidth and gain is high and the noise is lowOperational Amplifiers MCQs for Quiz 51). An op-amp IC MAX4238 provides current of _________150µA160µA600µA190µAHintAn op-amp IC MAX4238 provides a current of 600µA 52). The voltage-controlled current source is also known as ___________Voltage amplifierTransresistance amplifierTransconductance amplifierCurrent amplifierHintThe voltage-controlled current source is also known as a transconductance amplifier 53). The input offset current of an op-amp MAX4238 IC is ___________1µV2µV5µV4µVHintThe input offset current of an op-amp MAX4238 IC is 2µV 54). ____________ are the applications of an op-amp MAX4238 ICMedical instrumentsStrain gaugesThermocoupleAll of the aboveHintThe medical instruments, strain gauges, thermocouple, etc are the applications of an op-amp MAX4238 IC 55). ____________ are the applications of an op-amp OP07 ICOscillatorsStrain gaugesThermocoupleLow VOS composite amplifierHintThe low VOS composite amplifier is the applications of an op-amp OP07 IC 56). The current-controlled current source amplifier is also known as ____________Voltage amplifierTrans-resistance amplifierTrans-conductance amplifierCurrent amplifierHintThe current-controlled current source amplifier is also known as a current amplifier 57). How many pins does an op-amp IC OP07 have?EightTwoFourteenFourHintAn op-amp IC OP07 has eight pins 58). An op-amp OP07 IC has voltage gain of _________450V/mV550V/mV650V/mV750V/mVHintAn op-amp OP07 IC has voltage gain of 450V/mV 59). The output resistance value of an op-amp OP07 IC is __________50Ω60Ω80Ω70ΩHintThe output resistance value of an op-amp OP07 IC is 60Ω 60). The bandwidth of an op-amp OP07 IC is __________0.8MHz0.5MHz0.6MHz0.7MHzHintThe bandwidth of an op-amp OP07 IC is 0.6MHz 61). The slew rate of an op-amp MAX4238 IC is __________0.8V/µs0.35 V/µs0.6 V/µs0.7 V/µsHintThe slew rate of an op-amp MAX4238 IC is 0.35 V/µs 62). The maximum voltage supply of an op-amp MAX4238 IC is _____5V6V8V9VHintThe maximum voltage supply of an op-amp MAX4238 IC is 6V 63). The operating temperature range of an IC OP07 is ___________-40 to 95 deg-40 to 75 deg-40 to 65 deg-40 to 85 degHintThe operating temperature range of an IC OP07 is -40 to 85 deg 64). The slew rate of an op-amp OP07 IC is __________0.8V/µs0.3 V/µs0.6 V/µs0.7 V/µsHintThe slew rate of an op-amp OP07 IC is 0.3 V/µs 65). The CMRR value of an op-amp OP07 IC is __________103dB max104dB max105dB max106dB maxHintThe CMRR value of an op-amp OP07 IC is 106dB max 66). In common mode the input resistance of an op-amp OP07 IC is ____________50Ω60Ω80Ω70ΩHintIn common mode the input resistance of an op-amp OP07 IC is 50Ω 67). The CMRR value of an op-amp IC MAX4238 is _________140dB104dB105dB106dBHintThe CMRR value of an op-amp IC MAX4238 is 140dB 68). The bandwidth of an op-amp IC MAX4238 is _________1.5MHz10 MHz15 MHz1MHzHintThe bandwidth of an op-amp IC MAX4238 is 1MHz 69). In differential mode the input resistance value of an op-amp OP07 IC is __________150GΩ160GΩ180GΩ170GΩHintIn differential mode the input resistance value of an op-amp OP07 IC is 160GΩ 70). ____________ are the applications of an op-amp IC NE5532Audio mixerAV receiversHigh-performance audio preamplifiersAll of the aboveHintThe applications of an op-amp IC NE5532 are audio mixer, high-performance audio preamplifiers, av receivers, etc 71). How many pins does an op-amp IC TL074C have?EightTwoFourteenFourHintAn op-amp IC TL074C has 14 pins 72). The low offset voltage of an op-amp MAX4238 is _________1µV2µV5µV4µVHintThe low offset voltage of an op-amp MAX4238 is 2µV 73). _____________ are the applications of an op-amp IC TL074Square wave oscillatorOscillatorsHigh-Q Notch filterAll of the aboveHintSquare wave oscillator, oscillators, high-q notch filter are the applications of an op-amp IC TL074 74). An op-amp IC uA709M is a _______Quad amplifierMono amplifierDual amplifierNone of the aboveHintAn op-amp IC uA709M is a mono amplifier 75). Which IC is a bipolar op-amp?IC 741IC NE531IC CA313OEBoth a and bHintIC 741 & IC NE531 are bipolar op-ampsOperational Amplifiers MCQs With Hints 76). Which IC is a MOSFET op-amp?IC 741IC NE531IC CA3140EBoth a and bHintIC CA3140E is a MOSFET op-amp 77). ________ is a type of JFET op-ampIC TL081IC NE531IC CA3130EBoth a and bHintIC TL081 is a type of JFET op-amp 78). For an ideal op-amp the voltage gain value is _________ZeroOneInfinityNone of the aboveHintFor an ideal op-amp the voltage gain value is infinity 79). For a low noise 5534 op-amp the output impedance value is _____________5.0Ω0.4Ω0.3Ω0.7ΩHintFor a low noise 5534 op-amp the output impedance value is 0.3Ω 80). The large signal voltage gain of an op-amp IC 741 is ___________50 dB to 106dB60 dB to 106dB70 dB to 106dBNone of the boveHintThe large signal voltage gain of an op-amp IC 741 is 50 dB to 106dB 81). The large signal voltage gain of an op-amp IC TLC271 is ___________50 dB to 106dB60 dB to 106dB74 dB to 93dBNone of the boveHintThe large signal voltage gain of an op-amp IC TLC271is 74 dB to 93dB 82). The large signal voltage gain of an op-amp IC LMC660 is ___________92 dB to 126dB60 dB to 106dB74 dB to 93dBNone of the boveHintThe large signal voltage gain of an op-amp IC LMC660 is 92 dB to 126dB 83). How many types of gains are there in op-amps?OneTwoThreeFourHintThere are four types of gains are there in op-amps they are voltage gain, current gain, trans-conductance gain, and trans-resistance gain 84). ________ are the requirements for op-ampOffset nulling, feedbackStrobing or phase compensationBoth a and bNone of the aboveHintAn offset nulling, feedback, strobing, or phase compensation are the requirements for op-amp 85). __________ are the specifications of an audio power amplifierMaximum output powerFrequency responseNoise, distortionAll of the aboveHintThe maximum output power, frequency response, noise, distortion are the specifications of an audio power amplifier Read more about Amplifiers 86). The frequency range of an op-amp is from _________0Hz to 1MHz1Hz to 2MHz2Hz to 3MHzNone of the aboveHintThe frequency range of an op-amp is from 0Hz to 1MHz 87). The applications of an IC LM358N are _________PLCsActive filtersUninterruptible power supplyAll of the aboveHintThe applications of an IC LM358N are PLCs, active filters, and uninterruptible power supply 88). _____________ are the applications of an IC LM1458Portable devicesSumming amplifiersIntegrators, comparatorsAll of the aboveHintThe portable devices, summing amplifiers, integrators, comparators are the applications of an IC LM1458 89). The max voltage supply of an op-amp LM1458 IC is _________15V10V±18VNone of the aboveHintThe max voltage supply of an op-amp LM1458 IC is ±18V 90). The MOSFET op-amp CA3130E supply ________ current1.2mA1.5mA1.7mA1.8mAHintThe MOSFET op-amp CA3130E supplies 1.8mA current 91). The input voltage of the MOSFET op-amp s around ________4mv6mv7mv8mvHintThe input voltage of the MOSFET op-amp s around 8mv 92). The voltage gain of the JFET op-amp LF351 is _________88dB68dB78dB98dBHintThe voltage gain of the JFET op-amp LF351 is 88dB 93). The slew rate of JFET op-amp LF441 IC is __________10V/µs15 V/µs11 V/µs12 V/µsHintThe slew rate of JFET op-amp LF441 IC is 15 V/µs 94). An IC LM7171 useful as an _______Instrumentation amplifierHas high gain CMRRHas low gain CMRRBoth a and bHintAn IC LM7171 useful as an instrumentation amplifier and it has a high gain CMRR 95). The gain-bandwidth product of an op-amp FHP3130 is ________50MHz60MHz70MHz80MHzHintThe gain-bandwidth product of an op-amp FHP3130 is 60MHz 96). The gain-bandwidth product of an op-amp OPA369 is ________50MHz0.012MHz70MHz80MHzHintThe gain-bandwidth product of an op-amp OPA369is 0.012MHz 97). An op-amp FHP3350 is used as___________Video amplifierInstrumentation amplifierAudio amplifierNone of the aboveHintAn op-amp FHP3350 is used as a video amplifier and it has high speed 98). Which one is a Quad operational amplifier?AD8626AD8627AD8567None of the aboveHintIC AD8567 is a Quad operational amplifier 99). Which one is a dual operational amplifier?OP113OP162AD8065AD8034HintIC AD8034 is a dual operational amplifier 100). Who invented the operational amplifier?Karl D. SwartzelWilliam SturgeonEmily DavenportNone of the aboveHintThe operational amplifier invented by Karl D. Swartzel Read more about Operational Amplifiers Time is Up! Time's up
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