Question 10. When the difference of the two inputs applied to the two terminals of a differential amplifier is amplified, the resultant gain is termed as differential gain. Question 31. The CMMR of differential amplifier using BJT with emitter resistance at the common terminal where the emitters of both the BJT’s meet and output taken across the collector terminals is given as. The frequency response of the direct coupled amplifier is similar to low pass filter and is characterized by rise time. It is used as high frequency amplifier combined with common emitter amplifier. Integrators are widely used in ramp or sweep generators, filters, analog computers etc. Finite, Accurate and Stable Gain: Since the instrumentation amplifiers are required to amplify very low-level signals from the transducer device, high and finite gain is the basic requirement.The gain also needs to be accurate and the closed-loop gain must be stable. Following are the some of the characteristic parameters of CB amplifier neglecting the output resistance of amplifier (which accounts for early effect) are, Common emitter amplifier is on in which the emitter terminal is common to both input and output circuit. For n Non-interacting stages with each stage having lower and upper cut-off frequencies as fl, fh the upper and lower cut-off frequencies are given as follows. For a common collector amplifier, current gain is as high as for CE amplifier, voltage gain is less than unity, input resistance is the highest and the output resistance is the lowest of all the three (CE, ,CC and CB) configurations. use it to save in pdf. Explain What Is An Adder Or Summing Amplifier? Voltage follower is an electronic circuits in which output voltage tracts the input voltage both in sign and magnitude. What is an op-amp? Question 21. Such amplifiers are called cascade amplifiers. The band width, in a feedback amplifier. It is a device which converts a non electrical quantity into an … 72. Question 1. The formula for non inverting amplifier is given as 1+Rf/R1. In this condition it is known as perfect balance. Mention monolithic instumentaional amplifier? What are the important CPU registers in the 8085 microprocessor? The upper cut-off frequency of n interacting stages with each stage having upper cut-off frequencies fh is, 1/fh” = 1.1*((1/f1^2)+(1/f2^2)+……..+(1/fn^2))^(1/2). Explain What Is Transistor Biasing? Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry.He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. The process of determining the amount, degree, or capacity by comparison (direct or indirect) with the accepted standards of the system units being used. 2. what is accuracy of a measurement? 75. Analog and Digital Communication Viva Questions; Microwave Lab - Viva Questions; 8085 Microprocessor Lab - Viva Questions; Optical Communication Lab - Viva Questions 2018 (147) December (14) November (21) October (28) September (26) August (21) June (1) 2. Answer : An operational amplifier, abbreviated as op-amp, … Explain Why Open-loop Op-amp Configurations Are Not Used In Linear Applications? These capacitance’s introduce negative feedback from output to input which reduces the amplifier gain at high frequencies. Question 14. It is obvious from the expression of CMMR that increase in emitter degeneration resistance increases CMMR. Briefly discuss about a transistor? menu ExamSIDE Questions. There are mainly three types of coupling which are. kindly tell ,how to save the document. Question No. Adder or summing amplifier is a circuit that provides an output voltage proportional to or equal to the algebraic sum of two or more input voltages multiplied by a constant gain factor. 5. Alternatively in the improvised versions of differential amplifiers a constant current source is kept in emitter lead to provide very high resistance (Theoretically infinite). Electrical Measurements VIVA questions :-1. what is measurement? An instrumentation amplifier is a closed-loop gain block that has a differential input and an output that Making a great Resume: Get the basics right, Have you ever lie on your resume? Following are the some of the characteristic amplifiers of CC amplifier are, Gv = (Rb/(Rb+Rsig))*( ro//Rl/(Rsig//Rb/(β+1))+re+(ro//Rl))). How to Convert Your Internship into a Full Time Job? Voltage follower has three unique characteristics viz. Instrumentation Lab Viva Questions S Bharadwaj Reddy December 16, 2015 March 24, 2019 Are you preparing for instrumentation lab exams or instrumentation workshops ? Explain what is a rectifier? Question 26. Also it avoids the amplifiers going into DC saturation. Define Offset Voltage As Applied To An Op-amp? What is the upper cut-off for interacting stages? Does chemistry workout in job interviews? a) CB amplifiers have better frequency response than CE amplifier. How will you test IC741 for proper working? Question 20. 15 signs your job interview is going horribly, Time to Expand NBFCs: Rise in Demand for Talent, Nil drift of characteristics with temperature, Characteristics not drifting with temperature. Important Interview questions on OPAMP. Desensitivity factor is defined as the factor with which the feedback desensitizes the gain. An amplifier is an electronic device which increases the input signal's voltage, current, or power. It is the product of loop gain and feedback factor in positive feedback amplifiers. CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). OPAMP it is a direct coupled high gain differential input amplifier. This website uses cookies to improve your experience. What are the applications of transistor amplifiers? What is servo mechanisms? Explain the operation of Wheatstone bridge. Question 30. It is also known as the quiescent or Q-point. Question 12. Answer : Instrumentation engineering is the engineering specialization focused on the principle and operation of measuring instruments which are used in design and configuration of automated systems in … The main function of this amplifier is to diminish surplus noise that is chosen by the circuit. In addition, several dif-ferent categories of instrumentation amplifiers are addressed in this guide. Operational Amplifier's Previous Year Questions with solutions of Analog Electronics from GATE EE subject wise and chapter wise with solutions. Explain What Is An Operational Amplifier? This set of Linear Integrated Circuit Multiple Choice Questions & Answers (MCQs) focuses on “Ideal Operational Amplifier”. Amplifiers are of two types: power amplifiers or weak-signal amplifiers. Adder, subtractor, differentiator, integrator fall under the category of linear circuits. This resistance has to be high in order that the CMMR of differential amplifier to be high. An integrator is a circuit that performs a mathematical operation called integration. The proper flow of zero signal collector current and the maintenance of proper collector emitter voltage during the passage of signal is called the transistor biasing. Electronics and Communications Engineering Interview Questions, Electrical Engineering Interview Questions, Electronic Devices and Circuits Interview Questions, Electrical Power System Interview Questions, Electronics and Communications Engineering Practice Tests, Business administration Interview questions, Cheque Truncation System Interview Questions, Principles Of Service Marketing Management, Business Management For Financial Advisers, Challenge of Resume Preparation for Freshers, Have a Short and Attention Grabbing Resume. An Amplifier engineer is responsible for describing integrated circuit (IC) and solutions for customer products by converting the customer's requirements into the complete design and test specifications used to direct the design of the IC, Play an essential role in designing next-generation devices for audio amplifier business and make sure that those devices meet customer needs. Explain What Is An Integrator? instrumentation amplifiers commonly known as INAMPS are differantial amplifiers having high input impedane, low output impedance. Explain What Is An Ac Emitter Resistance? Looking to crack the Amplifier Job interview? Question 33. The main applications of amplifiers are: in wireless communications and broadcasting, audio devices etc. Then wisdom jobs is the best place to get started. Dear sir, List The Parameters That Should Be Considered For Ac And Dc Applications? In wireless receivers, weak-signal amplifiers are mainly used. Assumptions made for analyzing ideal op-amp are: Question 3. OPAMP is called direct coupled because the input of one OPAMP is inserted into the input of another OPAMP. P. $$\,\,\,\... GATE EE 2015 Set 1. A Transformer coupling is one in which the output stage of one amplifier is coupled to the input stage of next amplifier through a transformer. An instrumentation amplifier (InAmp) is an integrated circuit or operational amplifier topology that has high input impedance differential inputs and a low impedance single-sided output. Op-amp Is Used Mostly As An Integrator Than A Differentiation. Go through our Amplifier job interview questions and answers page to prepare well for the best job in reputed organizations. By choosing the appropriate turns ratio a transformer can be used to provide impedance matching with the load. Question 19. Darlington pair is a better buffer compared to single stage emitter follower circuit. Feed back is the parameter which quantifies the amount of feedback given in a feedback amplifier. There is a capacitor withinor outside of an op-ampto prevent oscillation. Why amplifier gains will reduce at higher frequency? A differential amplifier provides high gain for differential input signals and low gain for common mode signals. This makes the circuit analysis and design simplified and each stage can be considered as isolated as far as DC signals are considered. (a) remains unaffected (b) decreases by the same amount as the gain increase (c) increases by the sane saaaajajt as the gain decrease Additional characteristics include very low DC offset, low drift, low noise, very high open-loop gain, very high common-mode rejection ratio, and very high input impedances. Question 17. What Is The Formula For Non Inverting Amplifier? Instrumentation amplifier using opamp. Ltd. Wisdomjobs.com is one of the best job search sites in India. The extent to which the measured value deviates from the true value of the measurand. Inverting amplifier is a very versatile component and can be used for performing number of mathematical stimulation such as analog inverter, paraphrase amplifier, phase shifter, adder, integrator, and differentiator. We'll assume you're ok with this, but you can opt-out if you wish. What is linear regulator? Question 25. Such coupling is used in high frequency amplification. The differential amplifier implemented using BJT’s are shown below, The resistance in the emitter lead plays a crucial role in the functioning of differential amplifier. GO TO QUESTION. Question 2. Often amplifier with common emitter multi stages is referred to as Cascade amplifier. 2. It is designed to achieve wider bandwidth but dc gain approximately equal o that of common emitter amplifier. Explain What Is The Effect Of Removal Of Bypass Capacitor In A Ce Amplifier Circuit? If feedback from output to input is given in such in a way that the introduction of feedback in the amplifier decreases the overall gain, then the feedback is termed as negative feedback. IN-AMPS vs. OP AMPS: WHAT ARE THE DIFFERENCES? increases; decreases; is not affected; depends on R i; Answer : 1 Question 5. The gain and feedback factor in an amplifier are often functions of frequency, so the feedback may lead to positive feedback. 2. Question 24. 106 TOP CONTROL SYSTEMS LAB VIVA Questions and Answers PDF lab viva interview questions answers pdf jntu mcqs eee ece students. High CMRR ensures that the common mode signals such as noise are rejected successfully and the output voltage is proportional only to the differential input voltage. The closed-loop voltage gain of an inverting amplifier equals: A. the ratio of the input resistance to the feedback resistance B. the open-loop voltage gain C. the feedback resistance divided by the input resistance D. the input resistance Answer: C. 47. VIVA QUESTIONS: 1. Question 38. of what an instrumentation amplifier is, how it operates, and how and where to use it. If the feedback resistor in Q15 (above question) is open, the voltage gain ……. What are the applications of op-amps? 3. Explain What Is An Operational Amplifier? Explain Why Common-collector Circuit Is Known As An Emitter Follower? Read This, Top 10 commonly asked BPO Interview questions, 5 things you should never talk in any job interview, 2018 Best job interview tips for job seekers, 7 Tips to recruit the right candidates in 2018, 5 Important interview questions techies fumble most. The CC circuit amplifier is called an emitter follower because in this circuit the output voltage at the emitter terminal follows the input signal applied to the base terminal. State Assumptions Made For Analyzing Ideal Op-amp? Explain What Is Meant By Phase Reversal? Amplifier is a device that makes sound louder and signal level greater. Question 32. Question 15. Question No. 6 things to remember for Eid celebrations, 3 Golden rules to optimize your job search, Online hiring saw 14% rise in November: Report, Hiring Activities Saw Growth in March: Report, Attrition rate dips in corporate India: Survey, 2016 Most Productive year for Staffing: Study, The impact of Demonetization across sectors, Most important skills required to get hired, How startups are innovating with interview formats. Question 36. 3. infinite input impedance. Q16. Slew rate of an op-amp is defined as the maximum rate of change of output voltage per unit time and is expresses in V/µs. Desensitivity factor = (dAfb/Afb)/(dA/A) = 1/(1+A*β). Explain What Is Faithful Amplification? 4. The coupling capacitor blocks DC signal propagation across the amplifier and allows only AC signals. a) The CE amplifiers are used in applications where high gain is required. The degree of exactness (closeness) of a measurement compared to the expected (desired) value. Instrumentation amplifier is a kind of differential amplifier with additional input buffer stages. Measurements and Instrumentations LAB VIVA Questions :-1. This is the most frequently used coupling. Its low input resistance finds application in specific areas where the signal strengths are very low (or) when load on source should be very low. Measurement and Instrumentation Lab - VIVA QUESTIONS. An instrumentation amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. How Can Freshers Keep Their Job Search Going? Answer: An instrumentation amplifier is a differential op-amp circuit providing high input impedances with ease of gain adjustment by varying a single resistor. 46. The parameters to be considered for dc applications are: The parameters to be considered for ac applications are: Question 8. 71. Question 6. The main disadvantage with DC coupling is, since there is no DC isolation the first stage acts as a biasing circuitry for the second stage, the AC signal current is superimposed on DC quiescent currents and this effect propagates. A …, Bipolar Junction Transistors Questions & Answers…, 1. Hence using this as front end component out of band noise can be eliminated which is common to both input terminals. Explain What Are The Advantages Of Using A Voltage Follower Amplifier? If we give the sinusoidal input in differentiator we will get the output of differentiator as a square output. a) CB amplifiers have better frequency response than CE amplifier. Top 10 facts why you need a cover letter? b) CC amplifiers are used as voltage buffers for connecting high resistance source to low resistance load. What Is Instrumentation Instrumentation Engineering? An instrumentation amplifier is one kind of IC (integrated circuit), mainly used for amplifying a signal.This amplifier comes under the family of the differential amplifier because it increases the disparity among two inputs. 73. The zero signal values of IC and VCE are known as the operating point. Question 18. The dynamic resistance of the emitter-base junction diode is called the ac emitter resistance. Question 23. The MOSFET differential amplifier provides high input resistance but less gain compared to differential amplifiers implemented using BJT’s. Why Opamp Called Direct Coupled High Differential Circuit? Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier. Explain why an ordinary junction transistor is called bipolar? Explain Why? What is an inverting amplifier? Why slew rate is not infinite in Ideal op-amp? This role is highly respected, can receive considerable recognition and highly visible position with significant career advancement Amplifier jobs. Explain What Is Meant By Small Signal Amplifier? Explain What Are The Main Purposes For Which A Common-collector Amplifier May Be Used? All rights reserved © 2020 Wisdom IT Services India Pvt. It is called high gain differential circuit because the difference of the two input is amplified. Infinite voltage gain. An operational amplifier, abbreviated as op-amp, is basically a multi-stage, very high gain, direct-coupled, negative feedback amplifier that uses voltage shunt feedback to provide a stabilized voltage gain. The term Coupling occurs in multi stage amplifiers and refers to the way in which the output of one stage is connected to the input of next stage. The difference is in the source of excitation. Question 28. AC Millivoltmeter (2) Audio Systems (11) Basic Electronics (14) Bioelectric Amplifiers (5) Bioinformatics (12) Biomedical Instrumentation (71) Biotelemetry system (5) Bridges (12) ... 8085 Microprocessor Lab Viva Questions With Answers 1. Do you have employment gaps in your resume? It combines the high resistance, large Transconductance (high gain) achieved in common emitter amplifier with the superior high frequency response of common base amplifier. Removal of bypass capacitor in a CE amplifier circuit causes excessive degeneration in the amplifier circuit and therefore reduction in voltage gain. If feedback from output to input is given in such in a way that the introduction of feedback in the amplifier increases the overall gain, then the feedback is termed as positive feedback. Easier Gain Adjustment: Apart from a finite and stable gain, variation in the gain factor over a prescribed range of … 1. What is the gain of instrumentational amplifier? Explain What Is A Voltage Follower? Explain What Are The Applications Of An Inverting Amplifier? In an inverting amplifier, the input is connected to the minus or inverting terminal of op-amp. 70. Solution for Attached, a figure of the famous instrumentation amplifier. EXPNO.1 MEASUREMENT OF RESISTANCE USING WHEATSTONE BRIDGE. When an op-amp is operated in the open-loop configuration, the output either goes to positive saturation or negative saturation levels or switches between positive and negative saturation levels and thus clips the output above these levels. Some of the Advantages of negative feedback: The main disadvantage of negative feedback is decrease in overall gain. Engineering Electronics ECE Electrical EEE FAQs Measurements and Instruments Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF Download But when the two input terminals are connected to the same input source then the gain established by the differential amplifier is called the common mode gain. Ce amplifiers are used as voltage buffers for connecting high resistance source to resistance... And highly visible position with significant career advancement amplifier jobs the gain and it is known INAMPS... 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With solutions of Analog Electronics from GATE EE 2015 Set 1 why an ordinary Junction Transistor Experiment 1 be for... During an interview characterized by rise time have feedback loop why Open-loop op-amp Configurations not! And What are the main applications of amplifiers are used as high frequency amplifier combined with common multi. Amplifiers it is the Effect of degeneration resistance on CMMR and answers page to instrumentation amplifier viva questions well for the next i! Ramp output requirements for an instrumentation amplifier using opamp, subtraction * β.... Degree of reproducibility among several independent measurements of the advantages of negative feedback it! Resistance but less gain compared to single stage emitter Follower the degree of reproducibility among several independent measurements the... The MOSFET differential amplifier to be high of another opamp meet given amplifier specifications or... 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The measured value deviates from the true value of the same differential amplifiers implemented using MOSFET s! Recognition and highly visible position with significant career advancement amplifier jobs value deviates from the true value under conditions... Amplifiers and amplifies the voltage Follower amplifier are: Question 8, which.. Communications and broadcasting, audio devices etc in negative feedback is decrease in gain... ( impedance matching ) the CE amplifiers are used in applications where high gain differential amplifier. \... GATE EE 2015 Set 1 and DC applications the MOSFET differential amplifier provides high input impedane, output... Circuit and therefore reduction in voltage gain …… a high impedance source and a low load commonly. Amplifier and allows only ac signals under the category of linear circuits of Bypass capacitor in a CE circuit... Op AMPS: What is measurement electrical measurements VIVA questions and answers on Bipolar Junction questions. 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