Operational Amplifier Question & Answers September 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 Hint 2). 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 Hint 3). The operational amplifiers are used in __________ Waveform converter Oscillator Active filters All of the above Hint 4). The ideal operational amplifiers slew rate should be equal to _______ One Zero Infinity None of the above Hint 5). 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 Hint 6). How many output terminals does an operational amplifier have? One Two Four Three Hint 7). What is the standard form of CMRR? Common Module Rejection Ratio Common Mode Rejection Ratio Complex Mode Rejection Ratio None of the above Hint 8). For an ideal op-amp, the value of the common-mode rejection ratio should be equal to _______ One Zero Infinity None of the above Hint 9). 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 Hint 10). 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 Hint 11). 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 Hint 12). The input impedance value of an op-amp 741 is _____________ 2MΩ 4MΩ 5MΩ 7MΩ Hint 13). The output impedance value of an op-amp 741 is _________ 2MΩ 4MΩ 75MΩ 7MΩ Hint 14). 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 Hint 15). The offset voltage value of an ideal op-amp 741 is _________ 1mV 2mV 5mV 4mV Hint 16). In how many ways we can apply input to an op-amp? One Two Three Four Hint 17). 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 Hint 18). The CMRR value of an ideal op-amp 741 is _______ 70-100dB 70-80dB 70-90dB 70-110dB Hint 19). 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 Hint 20). 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 Hint 21). 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 Hint 22). The slew rate value of an ideal op-amp 741 is _______ 7.0V/µs 0.5V/µs 1V/µs 0.2V/µs Hint 23). An op-amp is a _______ Multistage amplifier High gain differential amplifier Performs mathematical operations All of the above Hint 24). An operational amplifiers are categorized into ______ One Two Three Four Hint 25). The feedback is provided in ____ op-amp Open-loop Close loop Both a and b None of the above Hint Operational Amplifiers MCQs for Interviews 26). The slew rate value of an ideal op-amp LF411 is _______ 7.0V/µs 0.5V/µs 15V/µs 0.2V/µs Hint 27). How many types of feedbacks are there in close loop op-amp? One Two Three Four Hint 28). __________ is an op-amp attribute Zero impedance Zero bias current Zero offset voltage None of the above Hint 29). ___________ are the op-amp input attributes Infinite impedance Zero bias current Respond to differential voltages All of the above Hint 30). _______ are the ideal op-amp attributes Zero common-mode gain Zero bias current Zero offset voltage All of the above Hint 31). The slew rate value of an op-amp LM318 is _______ 70V/µs 0.5V/µs 15V/µs 0.2V/µs Hint 32). How many pins does an op-amp 741 IC have? Fourteen Two Eight Four Hint 33). The input resistance value of an op-amp 741 IC is _______ 1MΩ to 3MΩ 1MΩ to 2MΩ 1MΩ to 4MΩ 1MΩ to 5MΩ Hint 34). The offset voltage of an op-amp 741 is _________ <3mV <4mV <50mV <10mV Hint 35). The offset current of an op-amp 741 is _________ 1nA 2nA 10nA 5nA Hint 36). The slew rate value of an op-amp LM6364 is _______ 300V/µs 0.5V/µs 15V/µs 0.2V/µs Hint 37). The output resistance value of an op-amp 741 IC is ________ 50Ω to 60Ω 50Ω to 70Ω 50Ω to 80Ω 50Ω to 100Ω Hint 38). 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 Hint 39). 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 Hint 40). In the feedback amplifier the negative feedback exit in how many ways? One Two Three Four Hint 41). The voltage-controlled voltage source is also known as ____________ Voltage amplifier Transresistance amplifier Transconductance amplifier Current amplifier Hint 42). ________ is an input in current-controlled voltage source amplifier Current Voltage Both a and b None of the above Hint 43). A circuit that amplifies the difference between two signals is called ______ amplifier Differential Inverting Non-inverting None of the above Hint 44). ________ is a circuit that compares two input voltages Integrator Comparator Differentiator None of the above Hint 45). A circuit that performs integration of input signals is known as _________ Integrator Comparator Differentiator None of the above Hint 46). ________ is an output in a current-controlled voltage source amplifier Current Voltage Both a and b None of the above Hint 47). The current-controlled voltage source amplifier is also known as ________ Voltage amplifier Transresistance amplifier Transconductance amplifier Current amplifier Hint 48). A circuit that performs mathematical differentiation of an input signal is called a ________ Integrator Comparator Differentiator None of the above Hint 49). When two input voltages are equal then the output of an op-amp should be equal to ________ One Zero Infinity None of the above Hint 50). An op-amp MAX4238 IC is _________ Gain is high Bandwidth is high Noise is low All of the above Hint Operational Amplifiers MCQs for Quiz 51). An op-amp IC MAX4238 provides current of _________ 150µA 160µA 600µA 190µA Hint 52). The voltage-controlled current source is also known as ___________ Voltage amplifier Transresistance amplifier Transconductance amplifier Current amplifier Hint 53). The input offset current of an op-amp MAX4238 IC is ___________ 1µV 2µV 5µV 4µV Hint 54). ____________ are the applications of an op-amp MAX4238 IC Medical instruments Strain gauges Thermocouple All of the above Hint 55). ____________ are the applications of an op-amp OP07 IC Oscillators Strain gauges Thermocouple Low VOS composite amplifier Hint 56). The current-controlled current source amplifier is also known as ____________ Voltage amplifier Trans-resistance amplifier Trans-conductance amplifier Current amplifier Hint 57). How many pins does an op-amp IC OP07 have? Eight Two Fourteen Four Hint 58). An op-amp OP07 IC has voltage gain of _________ 450V/mV 550V/mV 650V/mV 750V/mV Hint 59). The output resistance value of an op-amp OP07 IC is __________ 50Ω 60Ω 80Ω 70Ω Hint 60). The bandwidth of an op-amp OP07 IC is __________ 0.8MHz 0.5MHz 0.6MHz 0.7MHz Hint 61). 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 Hint 62). The maximum voltage supply of an op-amp MAX4238 IC is _____ 5V 6V 8V 9V Hint 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 deg Hint 64). 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 Hint 65). The CMRR value of an op-amp OP07 IC is __________ 103dB max 104dB max 105dB max 106dB max Hint 66). In common mode the input resistance of an op-amp OP07 IC is ____________ 50Ω 60Ω 80Ω 70Ω Hint 67). The CMRR value of an op-amp IC MAX4238 is _________ 140dB 104dB 105dB 106dB Hint 68). The bandwidth of an op-amp IC MAX4238 is _________ 1.5MHz 10 MHz 15 MHz 1MHz Hint 69). In differential mode the input resistance value of an op-amp OP07 IC is __________ 150GΩ 160GΩ 180GΩ 170GΩ Hint 70). ____________ are the applications of an op-amp IC NE5532 Audio mixer AV receivers High-performance audio preamplifiers All of the above Hint 71). How many pins does an op-amp IC TL074C have? Eight Two Fourteen Four Hint 72). The low offset voltage of an op-amp MAX4238 is _________ 1µV 2µV 5µV 4µV Hint 73). _____________ are the applications of an op-amp IC TL074 Square wave oscillator Oscillators High-Q Notch filter All of the above Hint 74). An op-amp IC uA709M is a _______ Quad amplifier Mono amplifier Dual amplifier None of the above Hint 75). Which IC is a bipolar op-amp? IC 741 IC NE531 IC CA313OE Both a and b Hint Operational Amplifiers MCQs With Hints 76). Which IC is a MOSFET op-amp? IC 741 IC NE531 IC CA3140E Both a and b Hint 77). ________ is a type of JFET op-amp IC TL081 IC NE531 IC CA3130E Both a and b Hint 78). For an ideal op-amp the voltage gain value is _________ Zero One Infinity None of the above Hint 79). For a low noise 5534 op-amp the output impedance value is _____________ 5.0Ω 0.4Ω 0.3Ω 0.7Ω Hint 80). 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 Hint 81). 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 Hint 82). 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 Hint 83). How many types of gains are there in op-amps? One Two Three Four Hint 84). ________ are the requirements for op-amp Offset nulling, feedback Strobing or phase compensation Both a and b None of the above Hint 85). __________ are the specifications of an audio power amplifier Maximum output power Frequency response Noise, distortion All of the above Hint Read more about Amplifiers 86). The frequency range of an op-amp is from _________ 0Hz to 1MHz 1Hz to 2MHz 2Hz to 3MHz None of the above Hint 87). The applications of an IC LM358N are _________ PLCs Active filters Uninterruptible power supply All of the above Hint 88). _____________ are the applications of an IC LM1458 Portable devices Summing amplifiers Integrators, comparators All of the above Hint 89). The max voltage supply of an op-amp LM1458 IC is _________ 15V 10V ±18V None of the above Hint 90). The MOSFET op-amp CA3130E supply ________ current 1.2mA 1.5mA 1.7mA 1.8mA Hint 91). The input voltage of the MOSFET op-amp s around ________ 4mv 6mv 7mv 8mv Hint 92). The voltage gain of the JFET op-amp LF351 is _________ 88dB 68dB 78dB 98dB Hint 93). The slew rate of JFET op-amp LF441 IC is __________ 10V/µs 15 V/µs 11 V/µs 12 V/µs Hint 94). An IC LM7171 useful as an _______ Instrumentation amplifier Has high gain CMRR Has low gain CMRR Both a and b Hint 95). The gain-bandwidth product of an op-amp FHP3130 is ________ 50MHz 60MHz 70MHz 80MHz Hint 96). The gain-bandwidth product of an op-amp OPA369 is ________ 50MHz 0.012MHz 70MHz 80MHz Hint 97). An op-amp FHP3350 is used as___________ Video amplifier Instrumentation amplifier Audio amplifier None of the above Hint 98). Which one is a Quad operational amplifier? AD8626 AD8627 AD8567 None of the above Hint 99). Which one is a dual operational amplifier? OP113 OP162 AD8065 AD8034 Hint 100). Who invented the operational amplifier? Karl D. Swartzel William Sturgeon Emily Davenport None of the above Hint Read more about Operational Amplifiers Time's up

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