5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and AnswersEngineering Interview Questions.com Engineering interview questions,multiple choice questions,objective type questions,seminor topics,lab viva questions and answers ,online quiz test pdf free download for freshers. HOME interview Questions MCQs *LAB VIVA CLASS NOTES SEMINAR TOPICS ONLINE TEST GATE IIT JEE CAT Custom Search Search Home » OPERATIONAL AMPLIFIERS Questions and powered by Answers » 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf Posted on March 18, 2017 by engineer 1 Comment OPERATIONAL AMPLIFIERS Questions and Answers pdf : 1. Explain what is an operational amplifier? An operational amplifier, abbreviated as opamp, is basically a multistage, very high gain, directcoupled, negative feedback amplifier that uses voltage shunt feedback to provide a stabilized voltage gain. http://engineeringinterviewquestions.com/operationalamplifiersquestionsanswerspdf/ 1/12 But when the two input Follow terminals are connected to the same input source then the gain 561 followers http://engineeringinterviewquestions.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers 2.122 likes Like Page Be the first of your friends to like this OPERATIONAL AMPLIFIERS Questions and Answers 4. for an opamp. Engineering Questions Engineering Questions 4. State assumptions made for analyzing ideal opamp. Explain what are differential gain and common mode gain of a differential amplifier? Find us on Google Plus When the difference of the two inputs applied to the two terminals of a differential amplifier is amplified. Explain what is a voltage transfer curve of an op amp? The curve drawn between output voltage and input differential voltage. the resultant Engineering intervie gain is termed as differential gain. Assumptions made for analyzing ideal opamp are : Infinite openloop gain Infinite input impedance Zero output impedance Perfect balance Infinite frqeuency bandwidth Infinite slew rate Infinite commonmode rejection ratio Nil drift of characteristics with temperature 3.com/operationalamplifiersquestionsanswerspdf/ 2/12 . keeping voltage gain A constant is known as voltage transfer curve. 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. Define CMRR. The parameters to be considered for dc applications are: Input offset voltage Input offset current Input bias current Drift The parameters to be considered for ac applications are: Gain bandwidth product (GBW) Rise time Slew rate Fullpower response http://engineeringinterviewquestions. 5. List the parameters that should be considered for ac and dc applications. Explain why does an opamp have high CMRR? 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. So openloop opamp configurations are not used in linear applications. 8.com/operationalamplifiersquestionsanswerspdf/ 3/12 . CMRR is defined as the ration of differential voltage gain to commonmode voltage gain and it is given as CMRR = Ad/Acm 6. 7.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers established by the differential amplifier is called the common mode gain. Explain why openloop opamp configurations are not used in linear applications? When an opamp is operated in the openloop configuration. 14. extremely high input impedance. 15. therefore. Define offset voltage as applied to an opamp. Slew rate of an opamp is defined as the maximum rate of change of output voltage per unit time and is expresses in V/µs. Negative voltageseries feedback. 12.com/operationalamplifiersquestionsanswerspdf/ 4/12 . Explain what kind of negative feedback is present in a noninverting opamp.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers AC noise 9. Define slew rate. Explain what are the advantages of using a voltage follower amplifier? Voltage follower has three unique characteristics viz. In Explain what way is the voltage follower a special case of the noninverting amplifier? http://engineeringinterviewquestions. 10. Explain what is a voltage follower? Voltage follower is an electronic circuit in which output voltage tracts the input voltage both in sign and magnitude. 13. Give the typical value of bias current for CA741 operational amplifier. extremely low output impedance and unity transmission gain and is . an ideal circuit device for use as a buffer amplifier. Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier. 80nA 11. Explain what is an adder or summing amplifier? 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. Explain what is a differential amplifier? Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. 19. 21. adder. Explain what is an inverting amplifier? In an inverting amplifier. Explain what are the applications of an inverting amplifier? Inverting amplifier is a very versatile component and can be used for performing number of mathematical stimulation such as analog inverter. Give examples of linear circuits. differentiator. paraphrase amplifier. integrator. integrator fall under the category of linear circuits. voltage follower is obtained. Adder. the input is connected to the minus or inverting terminal of opamp. 18. http://engineeringinterviewquestions.com/operationalamplifiersquestionsanswerspdf/ 5/12 . phase shifter. 17. differentiator. OPERATIONAL AMPLIFIERS Questions and Answers :: 16. Explain what is an integrator? An integrator is a circuit that performs a mathematical operation called integration.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers If feedback resistor is made zero or R1 is made ∞(by keeping it opencircuited) in a noninverting amplifier circuit. 20. subtractor. filters. Infinite slew rate 5. Explain what are the applications of integrators? Integrators are widely used in ramp or sweep generators. 27 What is the Formula for Non Inverting Amplifier? The formula for non inverting amplifier is given as 1+Rf/R1 28. Infinite bandwidth 26. infinite input impedance 4. Zero output impedance 3.com/operationalamplifiersquestionsanswerspdf/ 6/12 . Infinite voltage gain 2. Explain why? Opamp is used mostly as an integrator than a differentiator because in differentiator at high frequency. What is characteristic of Ideal OPAMP? Important Interview questions on OPAMP Characteristic of ideal OPAMP are 1. gain is high and so highfrequency noise is also amplified which absolutely abstract the differentiated signal.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers 22. The formula for CMRR is given below: CMRR = Ad/Acm 25. What is CMRR? CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). Opamp is used mostly as an integrator than a differentiator. 23. What is perfect balance in OPAMP? Important Interview questions on OPAMP http://engineeringinterviewquestions. Characteristics not drifting with temperature 6. What is Amplifier? Important Interview questions on OPAMP Amplifier is a device that makes sound louder and signal level greater. analog computers etc. 24. 29. What is the output Differentiator and Integrator? If we give the sinusoidal input in differentiator we will get the output of differentiator as a square output. In this condition it is known as perfect balance. 33. addition. For the CMRR to be infinite what will be the condition? CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). infinite input impedance. infinite bandwidth. The formula for CMRR is given below: CMRR = Ad/Acm If Acm will be zero then only it will be infinite. It has infinite voltage gain. If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output. zero output impedance. Why OPAMP called direct coupled high differential circuit? OPAMP is called direct coupled because the input of one OPAMP is inserted into the input of another OPAMP. Which OPAMP don’t have feedback loop? Comparator OPAMP (operational amplifier) don’t have feedback loop.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers Perfect balance is the characteristics of ideal OPAMP and if there is same input applied then we will get the output zero. http://engineeringinterviewquestions. integration. 32. It is called operational amplifier because it is used for performing different functions like differentiation. It is called high gain differential circuit because the difference of the two input is amplified.com/operationalamplifiersquestionsanswerspdf/ 7/12 . 30. infinite slew rate. subtraction. Why OPAMP called operational Amplifier? Important Interview questions on OPAMP OPAMP it is a direct coupled high gain differential input amplifier. 31. infinite output impedance B. most controlled parameter D. internal voltage gain the device is capable of C. difference amplifier B. Another name for a unity gain amplifier is: A. greater than one C.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers 34. linear regulator B. of zero D. switching regulator C. external voltage gain the device is capable of B. same as Acl Answer: B 37. equal to one Answer: B 39. A noninverting closedloop opamp circuit generally has a gain factor: A.com/operationalamplifiersquestionsanswerspdf/ 8/12 . single ended D. the opamp circuit requires: http://engineeringinterviewquestions. All of the above Answer: C 35. An ideal operational amplifier has A. The openloop voltage gain (Aol) of an opamp is the A. voltage follower Answer: D 36. In order for an output to swing above and below a zero reference. dctodc converter Answer: A 38. infinite bandwidth D. shunt regulator D. A series dissipative regulator is an example of a: A. comparator C. less than one B. zero input impedance C. If ground is applied to the (+) terminal of an inverting opamp. zero offset C. a resistive feedback network B. a wide bandwidth D. noninverting B. an input signal http://engineeringinterviewquestions. Opamps used as high and lowpass filter circuits employ which configuration? A. the (–) terminal will: A. the returning signal: A. aids the input signal B. comparator C. With negative feedback. not need an input resistor B. bistable multivibrator D.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers A. a negative and positive supply Answer: D 40. inverting Answer: D 41. is proportional to differential voltage gain Answer: C 44. freerunning multivibrator C. An astable multivibrator is also known as a: A. openloop D. oneshot multivibrator B. have high reverse current D. be virtual ground C. monostable multivibrator Answer: B 43. a trigger B. not invert the signal Answer: B 42. is proportional to output current C. opposes the input signal D. What starts a freerunning multivibrator? A.com/operationalamplifiersquestionsanswerspdf/ 9/12 . operational Answer: C 49. the returning signal A. an external circuit D. singleended Answer: A 48. With negative feedback. distortion C. A portion of the output that provides circuit stabilization is considered to be: A. All of the following are basic opamp input modes of operation EXCEPT A. The closedloop voltage gain of an inverting amplifier equals: A. commonmode C. the input resistance Answer: C 47. negative feedback B. doubleended D. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier? A. openloop D. inverting mode B. positive feedback Answer: A 46. the feedback resistance divided by the input resistance D. is proportional to the output current http://engineeringinterviewquestions.com/operationalamplifiersquestionsanswerspdf/ 10/12 . the openloop voltage gain C. darlington C. the ratio of the input resistance to the feedback resistance B.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers C. commonmode B. differential D. nothing Answer: D 45. opposes the input signal D.5/20/2017 100 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf OPERATIONAL AMPLIFIERS Questions and Answers B. differentialmode rejection C. amplitude B. 30 TOP OPERATIONAL AMPLIFIERS Questions and Answers pdf ← 20 TOP INTEGRATED 20 TOP 555 IC TIMER Questions CIRCUITS Questions and and Answers pdf → Answers pdf ONE THOUGHT ON “100 TOP OPERATIONAL AMPLIFIERS QUESTIONS AND ANSWERS PDF” Haftu Hiluf DECEMBER 27. The ratio between differential gain and common mode gain is called: A. Thank you REPLY http://engineeringinterviewquestions. 2016 AT 7:32 PM It was helpful to understand the concepts of opamp.com/operationalamplifiersquestionsanswerspdf/ 11/12 . commonmode rejection D. phase Answer: C OPERATIONAL AMPLIFIERS Questions and Answers pdf free download :: Posted in OPERATIONAL AMPLIFIERS Questions and Answers Tagged 100 LATEST OPERATIONAL AMPLIFIERS Questions and Answers. aids the input signal Answer: C 50. is proportional to the differential voltage gain C. Terms & Conditions | Privacy Policy | Contact us | About us http://engineeringinterviewquestions.seminor topics.online quiz test pdf free download for freshers.com/operationalamplifiersquestionsanswerspdf/ 12/12 . 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