Related InterviewSolutions

• Which of these is incorrect for an operational amplifier?(a) It has a high voltage gain(b) It is a direct coupled amplifier(c) It is only useful for amplifying AC signals(d) It was originally designed to perform mathematical operationsThis question was posed to me in an interview for internship.I'd like to ask this question from Operational Amplifiers topic in portion Op-amps and its Applications of Analog Circuits
• In the given block diagram of an op-amp. What are A, B, C and D?(a) A = Dual input and balanced output differential amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Power amplifier(b) A = Dual input and balanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Dual input and unbalanced output differential amplifier, D = Normal amplifier(c) A = Dual input and unbalanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Voltage regulator, D = Power amplifier(d) A = Normal amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Dual input and balanced output differential amplifierThe question was posed to me in an interview.This intriguing question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits
• Given that for an op-amp the gain is 10^3, the slew rate is 1.5V/μsec. Input is 5×10^-3sinωt, calculate maximum frequency to prevent distortion.(a) 47.7 kHz(b) 0.3 MHz(c) 477 Hz(d) 3 kHzThe question was posed to me in my homework.I want to ask this question from Operational Amplifiers topic in division Op-amps and its Applications of Analog Circuits
• A practical op-amp has a bandwidth of only 10 Hz. Gain is 10^6, and the required bandwidth is 100 kHz. How much feedback is required?(a) 0.99% negative feedback(b) 0.99% positive feedback(c) 1% negative feedback(d) 1% positive feedbackThis question was posed to me in examination.My question is based upon Operational Amplifiers in section Op-amps and its Applications of Analog Circuits
• In an ideal op-amp, which is not true?(a) Open loop voltage gain is infinite(b) Input resistance is infinite(c) Slew rate is infinite(d) CMRR is zeroThis question was addressed to me at a job interview.My query is from Operational Amplifiers in chapter Op-amps and its Applications of Analog Circuits
• Given that CMRR is 100dB. Input common-mode voltage is 12 V. Differential voltage gain is 4000. Calculate output common-mode voltage.(a) 48V(b) 0.48V(c) 20V(d) 11VThis question was posed to me during an online interview.My question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits
• The unity gain bandwidth for an op-amp having open loop gain 2×10^6 is 10 Mhz. Calculate the AC gain of op-amp at an input of 2000 Hz.(a) 2000(b) 5000(c) 10000(d) 12.5The question was asked in an interview for job.My query is from Operational Amplifiers in chapter Op-amps and its Applications of Analog Circuits
• Till what frequency do we get amplification from IC 741?(a) Unity gain bandwidth(b) 3-dB frequency(c) Infinity(d) UGB + fOLThe question was posed to me in an online quiz.The doubt is from Operational Amplifiers in portion Op-amps and its Applications of Analog Circuits
• What is the use of the compensation capacitor in op-amp?(a) Improves the amplification of op-amp(b) Decreases the slew rate of op-amp(c) Increases the bandwidth of op-amp(d) Op-amp acts as all pass filterThe question was asked at a job interview.My question is based upon Operational Amplifiers in division Op-amps and its Applications of Analog Circuits
• Which is not a difference between active and passive filter?(a) A passive filter does not use op-amp while an active filter uses an op-amp(b) A passive filter can’t use an inductor while an active filter can(c) A passive filter performs only filtering while an active filter amplifies too(d) A passive filter is used at audio frequency and an active at radio frequencyThe question was asked at a job interview.My doubt stems from Frequency Filters topic in portion Op-amps and its Applications of Analog Circuits