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? One Two Four Three HintAn operational amplifier has two input terminals they are inverting and non-inverting terminals2). If the input terminal of an op-amp is positive then that terminal is known as ____________ Inverting Non-inverting Both a and b None of the above HintIf the input terminal of an op-amp is positive then that terminal is known as a non-inverting terminal3). The operational amplifiers are used in __________ Waveform converter Oscillator Active filters All of the above HintThe operational amplifiers are used in waveform converter, oscillator, active filters, etc4). The ideal operational amplifiers slew rate should be equal to _______ One Zero Infinity None of the above HintThe ideal operational amplifiers slew rate should be equal to infinity5). If the input terminal of an op-amp is negative then that terminal is known as ____________ Inverting Non-inverting Both a and b None of the above HintIf the input terminal of an op-amp is negative then that terminal is known as inverting terminal6). How many output terminals does an operational amplifier have? One Two Four Three HintAn operational amplifier has only one output terminal7). What is the standard form of CMRR? Common Module Rejection Ratio Common Mode Rejection Ratio Complex Mode Rejection Ratio None of the above HintThe standard form of CMRR is Common Mode Rejection Ratio8). For an ideal op-amp, the value of the common-mode rejection ratio should be equal to _______ One Zero Infinity None of the above HintFor an ideal op-amp, the value of the common-mode rejection ratio should be equal to infinity9). Common mode rejection ratio is defined as a ratio of _________ Differential gain/common mode Differential gain-common mode Differential gain*common mode None of the above HintCommon mode rejection ratio is defined as a ratio of differential gain/common mode10). The ideal op-amp has _______ Open-loop gain is Infinite Zero output impedance, the input impedance is infinite Slew rate and infinite bandwidth All of the above HintThe input impedance, open-loop gain, and the bandwidth in ideal operational amplifiers is infinite and it has zero output impedance and slew rate11). Whenever the input is equal to zero in an ideal op-amp then at that time the output is equal to ________ One Zero Infinity None of the above HintWhenever the input is equal to zero in an ideal op-amp then at that time the output is equal to zero12). The input impedance value of an op-amp 741 is _____________ 2MΩ 4MΩ 5MΩ 7MΩ HintThe input impedance value of an op-amp 741 is 2MΩ13). The output impedance value of an op-amp 741 is _________ 2MΩ 4MΩ 75MΩ 7MΩ HintThe output impedance value of an op-amp 741 is 75MΩ14). The feedback from output to the non-inverting input terminal is known as ___________ Positive feedback Negative feedback Both a and b None of the above HintThe feedback from output to the non-inverting input terminal is known as positive feedback15). The offset voltage value of an ideal op-amp 741 is _________ 1mV 2mV 5mV 4mV HintThe offset voltage value of an ideal op-amp 741 is 1mV16). In how many ways we can apply input to an op-amp? One Two Three Four HintIn 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 terminal17). For general purpose op-amps, the value of the input bias current is in the range of ______ Nano- amperes Micro- amperes Femto-amperes All of the above HintFor 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 amplifiers18). The CMRR value of an ideal op-amp 741 is _______ 70-100dB 70-80dB 70-90dB 70-110dB HintThe CMRR value of an ideal op-amp 741 is 70-90dB19). The input bias current value of the LT6273 op-amp is in the range of ____ Nano- amperes Micro- amperes Femto-amperes None of the above HintThe input bias current value of the LT6273 op-amp is in the range of micro- amperes20). The input bias current value of the LM741 op-amp is in the range of ____ Nano- amperes Micro- amperes Femto-amperes None of the above HintThe input bias current value of the LM741 op-amp is in the range of nano-amperes21). The input bias current value of the AD549 op-amp is in the range of ____ Nano- amperes Micro- amperes Femto-amperes None of the above HintThe input bias value of the AD549 op-amp is in the range of femto-amperes22). The slew rate value of an ideal op-amp 741 is _______ 7.0V/µs 0.5V/µs 1V/µs 0.2V/µs HintThe slew rate value of an ideal op-amp 741 is 0.5V/µs23). An op-amp is a _______ Multistage amplifier High gain differential amplifier Performs mathematical operations All of the above HintAn op-amp is a multistage amplifier, high gain differential amplifier, and performs mathematical operations24). An operational amplifiers are categorized into ______ One Two Three Four HintAn operational amplifiers are categorized into two types they are open loop and close loop op-amps25). The feedback is provided in ____ op-amp Open-loop Close loop Both a and b None of the above HintThe feedback is provided in close loop op-ampOperational Amplifiers MCQs for Interviews26). The slew rate value of an ideal op-amp LF411 is _______ 7.0V/µs 0.5V/µs 15V/µs 0.2V/µs HintThe slew rate value of an ideal op-amp LF411is 15V/µs27). How many types of feedbacks are there in close loop op-amp? One Two Three Four HintThere are two types of feedbacks are there in close loop op-amp they are positive and negative feedback28). __________ is an op-amp attribute Zero impedance Zero bias current Zero offset voltage None of the above HintZero impedance is an op-amp attribute29). ___________ are the op-amp input attributes Infinite impedance Zero bias current Respond to differential voltages All of the above HintInfinite impedance, zero bias current, and response to differential voltages are the op-amp input attributes30). _______ are the ideal op-amp attributes Zero common-mode gain Zero bias current Zero offset voltage All of the above Hintzero common-mode gain, zero bias current, and zero offset voltage are the ideal op-amp attributes31). The slew rate value of an op-amp LM318 is _______ 70V/µs 0.5V/µs 15V/µs 0.2V/µs HintThe slew rate value of an op-amp LM318 is 70V/µs32). How many pins does an op-amp 741 IC have? Fourteen Two Eight Four HintAn op-amp 741 IC has eight pins33). The input resistance value of an op-amp 741 IC is _______ 1MΩ to 3MΩ 1MΩ to 2MΩ 1MΩ to 4MΩ 1MΩ to 5MΩ HintThe input resistance value of an op-amp 741 IC is 1MΩ to 2MΩ34). The offset voltage of an op-amp 741 is _________ <3mV <4mV <50mV <10mV HintThe offset voltage of an op-amp 741 is <10mV35). The offset current of an op-amp 741 is _________ 1nA 2nA 10nA 5nA HintThe offset current of an op-amp 741 is 10nA36). The slew rate value of an op-amp LM6364 is _______ 300V/µs 0.5V/µs 15V/µs 0.2V/µs HintThe slew rate value of an op-amp LM6364 is 300V/µs37). The output resistance value of an op-amp 741 IC is ________ 50Ω to 60Ω 50Ω to 70Ω 50Ω to 80Ω 50Ω to 100Ω HintThe output resistance value of an op-amp 741 IC is 50Ω to 100Ω38). The average of two currents that flow into inverting and non-inverting terminals of an op-amp is known as input __________ Bias current Offset current Offset voltage All of the above HintThe average of two currents that flow into inverting and non-inverting terminals of an op-amp is known as input bias current39). The algebraic difference between the currents into an inverting and non-inverting terminal is known as _______ Input bias current Input offset current Input offset voltage None of the above HintThe algebraic difference between the currents into inverting and non-inverting terminals is known as input offset current40). In the feedback amplifier the negative feedback exit in how many ways? One Two Three Four HintIn feedback amplifier the negative feedback exit in four ways such as VCVS, ICVS, VCIS, and ICIS41). The voltage-controlled voltage source is also known as ____________ Voltage amplifier Transresistance amplifier Transconductance amplifier Current amplifier HintThe voltage-controlled voltage source is also known as a voltage amplifier42). ________ is an input in current-controlled voltage source amplifier Current Voltage Both a and b None of the above HintCurrent is input in current-controlled voltage source amplifier43). A circuit that amplifies the difference between two signals is called ______ amplifier Differential Inverting Non-inverting None of the above HintA circuit that amplifies the difference between two signals is called the differential amplifier44). ________ is a circuit that compares two input voltages Integrator Comparator Differentiator None of the above HintComparator is a circuit that compares two input voltages45). A circuit that performs integration of input signals is known as _________ Integrator Comparator Differentiator None of the above HintA circuit that performs the integration of input signals is known as an integrator46). ________ is an output in a current-controlled voltage source amplifier Current Voltage Both a and b None of the above HintVoltage is an output in a current-controlled voltage source amplifier47). The current-controlled voltage source amplifier is also known as ________ Voltage amplifier Transresistance amplifier Transconductance amplifier Current amplifier HintThe current-controlled voltage source amplifier is also known as a trans-resistance amplifier48). A circuit that performs mathematical differentiation of an input signal is called a ________ Integrator Comparator Differentiator None of the above HintA circuit that performs mathematical differentiation of an input signal is called a differentiator49). When two input voltages are equal then the output of an op-amp should be equal to ________ One Zero Infinity None of the above HintWhen two input voltages are equal then the output of an op-amp should be equal to zero50). An op-amp MAX4238 IC is _________ Gain is high Bandwidth is high Noise is low All of the above HintIn an op-amp MAX4238 IC the bandwidth and gain is high and the noise is lowOperational Amplifiers MCQs for Quiz51). An op-amp IC MAX4238 provides current of _________ 150µA 160µA 600µA 190µA HintAn op-amp IC MAX4238 provides a current of 600µA52). The voltage-controlled current source is also known as ___________ Voltage amplifier Transresistance amplifier Transconductance amplifier Current amplifier HintThe voltage-controlled current source is also known as a transconductance amplifier53). The input offset current of an op-amp MAX4238 IC is ___________ 1µV 2µV 5µV 4µV HintThe input offset current of an op-amp MAX4238 IC is 2µV54). ____________ are the applications of an op-amp MAX4238 IC Medical instruments Strain gauges Thermocouple All of the above HintThe medical instruments, strain gauges, thermocouple, etc are the applications of an op-amp MAX4238 IC55). ____________ are the applications of an op-amp OP07 IC Oscillators Strain gauges Thermocouple Low VOS composite amplifier HintThe low VOS composite amplifier is the applications of an op-amp OP07 IC56). The current-controlled current source amplifier is also known as ____________ Voltage amplifier Trans-resistance amplifier Trans-conductance amplifier Current amplifier HintThe current-controlled current source amplifier is also known as a current amplifier57). How many pins does an op-amp IC OP07 have? Eight Two Fourteen Four HintAn op-amp IC OP07 has eight pins58). An op-amp OP07 IC has voltage gain of _________ 450V/mV 550V/mV 650V/mV 750V/mV HintAn op-amp OP07 IC has voltage gain of 450V/mV59). The output resistance value of an op-amp OP07 IC is __________ 50Ω 60Ω 80Ω 70Ω HintThe output resistance value of an op-amp OP07 IC is 60Ω60). The bandwidth of an op-amp OP07 IC is __________ 0.8MHz 0.5MHz 0.6MHz 0.7MHz HintThe bandwidth of an op-amp OP07 IC is 0.6MHz61). The slew rate of an op-amp MAX4238 IC is __________ 0.8V/µs 0.35 V/µs 0.6 V/µs 0.7 V/µs HintThe slew rate of an op-amp MAX4238 IC is 0.35 V/µs62). The maximum voltage supply of an op-amp MAX4238 IC is _____ 5V 6V 8V 9V HintThe maximum voltage supply of an op-amp MAX4238 IC is 6V63). The operating temperature range of an IC OP07 is ___________ -40 to 95 deg -40 to 75 deg -40 to 65 deg -40 to 85 deg HintThe operating temperature range of an IC OP07 is -40 to 85 deg64). The slew rate of an op-amp OP07 IC is __________ 0.8V/µs 0.3 V/µs 0.6 V/µs 0.7 V/µs HintThe slew rate of an op-amp OP07 IC is 0.3 V/µs65). The CMRR value of an op-amp OP07 IC is __________ 103dB max 104dB max 105dB max 106dB max HintThe CMRR value of an op-amp OP07 IC is 106dB max66). In common mode the input resistance of an op-amp OP07 IC is ____________ 50Ω 60Ω 80Ω 70Ω HintIn common mode the input resistance of an op-amp OP07 IC is 50Ω 67). The CMRR value of an op-amp IC MAX4238 is _________ 140dB 104dB 105dB 106dB HintThe CMRR value of an op-amp IC MAX4238 is 140dB 68). The bandwidth of an op-amp IC MAX4238 is _________ 1.5MHz 10 MHz 15 MHz 1MHz HintThe bandwidth of an op-amp IC MAX4238 is 1MHz69). In differential mode the input resistance value of an op-amp OP07 IC is __________ 150GΩ 160GΩ 180GΩ 170GΩ HintIn differential mode the input resistance value of an op-amp OP07 IC is 160GΩ70). ____________ are the applications of an op-amp IC NE5532 Audio mixer AV receivers High-performance audio preamplifiers All of the above HintThe applications of an op-amp IC NE5532 are audio mixer, high-performance audio preamplifiers, av receivers, etc71). How many pins does an op-amp IC TL074C have? Eight Two Fourteen Four HintAn op-amp IC TL074C has 14 pins72). The low offset voltage of an op-amp MAX4238 is _________ 1µV 2µV 5µV 4µV HintThe low offset voltage of an op-amp MAX4238 is 2µV73). _____________ are the applications of an op-amp IC TL074 Square wave oscillator Oscillators High-Q Notch filter All of the above HintSquare wave oscillator, oscillators, high-q notch filter are the applications of an op-amp IC TL07474). An op-amp IC uA709M is a _______ Quad amplifier Mono amplifier Dual amplifier None of the above HintAn op-amp IC uA709M is a mono amplifier75). Which IC is a bipolar op-amp? IC 741 IC NE531 IC CA313OE Both a and b HintIC 741 & IC NE531 are bipolar op-ampsOperational Amplifiers MCQs With Hints76). Which IC is a MOSFET op-amp? IC 741 IC NE531 IC CA3140E Both a and b HintIC CA3140E is a MOSFET op-amp77). ________ is a type of JFET op-amp IC TL081 IC NE531 IC CA3130E Both a and b HintIC TL081 is a type of JFET op-amp78). For an ideal op-amp the voltage gain value is _________ Zero One Infinity None of the above HintFor an ideal op-amp the voltage gain value is infinity79). For a low noise 5534 op-amp the output impedance value is _____________ 5.0Ω 0.4Ω 0.3Ω 0.7Ω HintFor a low noise 5534 op-amp the output impedance value is 0.3Ω80). The large signal voltage gain of an op-amp IC 741 is ___________ 50 dB to 106dB 60 dB to 106dB 70 dB to 106dB None of the bove HintThe large signal voltage gain of an op-amp IC 741 is 50 dB to 106dB81). The large signal voltage gain of an op-amp IC TLC271 is ___________ 50 dB to 106dB 60 dB to 106dB 74 dB to 93dB None of the bove HintThe large signal voltage gain of an op-amp IC TLC271is 74 dB to 93dB82). The large signal voltage gain of an op-amp IC LMC660 is ___________ 92 dB to 126dB 60 dB to 106dB 74 dB to 93dB None of the bove HintThe large signal voltage gain of an op-amp IC LMC660 is 92 dB to 126dB83). How many types of gains are there in op-amps? One Two Three Four HintThere are four types of gains are there in op-amps they are voltage gain, current gain, trans-conductance gain, and trans-resistance gain84). ________ are the requirements for op-amp Offset nulling, feedback Strobing or phase compensation Both a and b None of the above HintAn offset nulling, feedback, strobing, or phase compensation are the requirements for op-amp85). __________ are the specifications of an audio power amplifier Maximum output power Frequency response Noise, distortion All of the above HintThe maximum output power, frequency response, noise, distortion are the specifications of an audio power amplifier Read more about Amplifiers86). The frequency range of an op-amp is from _________ 0Hz to 1MHz 1Hz to 2MHz 2Hz to 3MHz None of the above HintThe frequency range of an op-amp is from 0Hz to 1MHz87). The applications of an IC LM358N are _________ PLCs Active filters Uninterruptible power supply All of the above HintThe applications of an IC LM358N are PLCs, active filters, and uninterruptible power supply88). _____________ are the applications of an IC LM1458 Portable devices Summing amplifiers Integrators, comparators All of the above HintThe portable devices, summing amplifiers, integrators, comparators are the applications of an IC LM145889). The max voltage supply of an op-amp LM1458 IC is _________ 15V 10V ±18V None of the above HintThe max voltage supply of an op-amp LM1458 IC is ±18V90). The MOSFET op-amp CA3130E supply ________ current 1.2mA 1.5mA 1.7mA 1.8mA HintThe MOSFET op-amp CA3130E supplies 1.8mA current 91). The input voltage of the MOSFET op-amp s around ________ 4mv 6mv 7mv 8mv HintThe input voltage of the MOSFET op-amp s around 8mv92). The voltage gain of the JFET op-amp LF351 is _________ 88dB 68dB 78dB 98dB HintThe voltage gain of the JFET op-amp LF351 is 88dB93). The slew rate of JFET op-amp LF441 IC is __________ 10V/µs 15 V/µs 11 V/µs 12 V/µs HintThe slew rate of JFET op-amp LF441 IC is 15 V/µs94). An IC LM7171 useful as an _______ Instrumentation amplifier Has high gain CMRR Has low gain CMRR Both a and b HintAn IC LM7171 useful as an instrumentation amplifier and it has a high gain CMRR95). The gain-bandwidth product of an op-amp FHP3130 is ________ 50MHz 60MHz 70MHz 80MHz HintThe gain-bandwidth product of an op-amp FHP3130 is 60MHz96). The gain-bandwidth product of an op-amp OPA369 is ________ 50MHz 0.012MHz 70MHz 80MHz HintThe gain-bandwidth product of an op-amp OPA369is 0.012MHz97). An op-amp FHP3350 is used as___________ Video amplifier Instrumentation amplifier Audio amplifier None of the above HintAn op-amp FHP3350 is used as a video amplifier and it has high speed98). Which one is a Quad operational amplifier? AD8626 AD8627 AD8567 None of the above HintIC AD8567 is a Quad operational amplifier99). Which one is a dual operational amplifier? OP113 OP162 AD8065 AD8034 HintIC AD8034 is a dual operational amplifier100). Who invented the operational amplifier? Karl D. Swartzel William Sturgeon Emily Davenport None of the above HintThe operational amplifier invented by Karl D. Swartzel Read more about Operational Amplifiers Time is Up! Time's up

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