(the collector current is non zero) when an input sinusoidal signal is applied in a power amplifier is defined as Conduction angle. Where it is used? This website uses cookies to improve your experience. Refer to Figure 7-3. A class A amplifier with RC = 3.3 kΩ and RE = 1.2 kΩ has a VCC = 20 V. Find IC(sat). A. class AB amplifier. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. Another advantage of the push pull amplifier is the effect of ripple voltage that may be contained in the power supply is balanced out. Because the transistor operation is carried out by two types of charge carriers (maj…, Semiconductors Diodes Questions & Answers, What is a PN junction diode? Practice Exam Test Questions . Measurement And Instrument Theory - 1 - MCQs with answers Q1. Give expressions for Ri, Ro, Voltage gain of CS, CD, CG? MCQ in Operational Amplifiers from the book Electronic Devices and Circuit Theory 10th Edition by Boylestad. Quiescent power is the power dissipation of a transistor, 3. There are four different types of feedback topologies based on type of output signal and feedback signal (voltage or current signal). b) Frequency distortion: This type of distortion occurs when the signal components of different frequencies are amplified differently. (C) nearly twice cut-off. The time during which the transistor conducts i.e. You find that this amplifier only shows the negative alternation at the output. Choose the letter of the best answer in each questions. You measure the dc voltage of Q1 emitter and find it equal to 0 V. The trouble might be, 20. c) The saturation voltage V CE for silicon transistor is same as that for germanium. Noise with feedback = Noise without feedback* desensitivity factor (since desensitivity factor << 1 in negative feedback, hence Noise without feedback > Noise without feedback). It cancels out any signals that have the same potential on both the inputs. Current gain of an amplifier is defined as ratio of output current to input current fed to amplifier. They are. The voltage gain, bandwidth, noise, nonlinear distortion, input resistance, output resistance are. 28. Which of the following statement is true? What do you call an amplifier which has an output current flowing during the whole input current cycle? They are used as frequency selective amplifiers in multi communication channels such as radio and TV broadcasting through wireless medium where each station is assigned a frequency band. There are four types of amplifiers based on input signal fed to it and the output signal extracted from it. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. D) a square wave with a frequency determined by the tank. To increase the current sensitivity below 10 mV, electronic instrument uses A. Amplifiers B. Voltage gain with feedback = Voltage gain without feedback* desensitivity factor (since desensitivity factor << 1 in negative feedback, hence Voltage gain without feedback < gain without feedback). BACK TO TOP. MCQ on Measuring Instruments – 3. Selecting an appropriate op amp is an important part in designing an instrumentation amplifier. (Last Updated On: December 8, 2019) This is the Multiple Choice Questions in Special-Purpose Op-Amp Circuits from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. This amplifier is operating as a ______ amplifier. A pinoybix mcq, quiz and reviewers. The name PN junction diode stands for a junction termed as PN junction formed by injecting into one side of intrinsic sem…, Peak Inverse Voltage of Center Tap Rectifier, Gap Voltage of Bently Nevada Vibration Probe. A class _____ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180º of the input cycle. The most likely choice would be a ______ amplifier. Leave a Reply Cancel reply. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Also provides professionals with materials for their lectures and practice exams. (B) just at cut-off. Tuned amplifiers are used in video and radio frequency applications. The tuned amplifier shown in the figure will deliver maximum power only in the bandwidth of LC resonant circuit. Answered MCQ; Instrumentation amplifier is an extension of # Non inverting amplifier Inverting amplifier Summing amplifier Differential amplifier Comments and Answers (2) # New frequencies appear in the output due to non linear distortion. It is employed in Transconductance amplifiers. Push pull amplifiers are more efficient than the single ended power amplifiers. Choose the letter of the best answer in each questions. A class A amplifier has a voltage gain of 30 and a current gain of 25. Also, low power consumption, high slew rate and high common-mode rejection ratio are desirable for good performance. 5. A pinoybix mcq, quiz and reviewers. Instrumentation Amplifier Definition: A special type of amplifier that is used to amplify signals of extremely low-level is known as Instrumentation Amplifier. If the nyquist plot of amplifiers does not encircle (-1, 0) point in nyquist domain, the amplifier is stable and has negative feedback. Home » Electronics » Questions and Answers » Floyd Questions and Answers ». You have an application for a power amplifier to operate on FM radio frequencies. Class B amplifier: Class B amplifiers are biased at zero DC bias collector current. Phase distortion will not create much problem in audio amplifiers. A power amplifier stage is an amplifier optimized to deliver high output power. At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. The main difficulty with this circuit is the if there is unbalance in the characteristic f the two transistors considerable distortion will be introduced. C) because the collector terminal is the critical terminal for heat dissipation. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Linear Applications of Op-amp 1) Due to presence of a capacitor in feedback path, the output of an integrator varies ______ a. Trans-resistance of an amplifier is defined as ratio of output voltage to input current fed to amplifier. Tuned amplifier is one in which a tuned circuit is introduced in to the output circuit which draws maximum power output only for a specified range of frequencies. a)Voltage-series: Output signal is voltage signal, feedback signal is voltage signal. It is used as high frequency amplifier combined with common emitter amplifier. Define conduction angle in power amplifier? B. class B amplifier. Class B amplifier: Class B amplifiers are biased at zero DC bias collector current.Hence it conducts only for half of the input signal cycle, so the conduction angle for class B amplifier is 180 Degrees. In complementary push pull amplifier neither an input nor an output transformer is needed. Instrumentation Amplifier provides the most important function of Common-Mode Rejection (CMR). It has high CMMR, offers high input impedance and consumes less power. The instrumentation amplifier will require three op amps. D) because the collector terminal is located nearest the case. C) slightly less than 180° of the input cycle. The Q-point is at cutoff for class _____ operation. What is the power gain? You find that there is an input signal on the base of Q1 and Q2. Voltage gain of an amplifier is defined as ratio of output voltage to input voltage fed to amplifier. These devices amplify the difference between two input signal voltages while rejecting any signals that are common to both inputs. Figure 2.85 shows the schematic representation of a precision instrumentation amplifier. The class _____ amplifier is biased below cutoff. A. Also called as shunt-shunt feedback. The phase distortion is of prime concern in video amplifiers; hence extra elements are added to nullify distortion. They are used in RF/Wireless transceivers and intermediate stages of IF amplifiers. Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier ) In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Also called as shunt-shunt feedback. Class A amplifier: In class-A amplifiers the collector is biased at a value greater than the amplitude of AC signal current. It is employed in current amplifiers. It is specified in units of ohms and is denoted by Rt. They are. MCQ in Rectifier ; MCQ in Filters ; MCQ in Voltage Regulation; Continue Practice Exam Test Questions Part 6 of the Series. 251. What are types of power amplifier based on conduction angle? Class C amplifier: In class C amplifier the transistor conducts for an interval less than the half cycle. A) slightly more than 180° of the input cycle. You have an oscilloscope across RL and it shows a zero signal voltage. Refer to Figure 7-3. Which amplifier is commonly used as a frequency multiplier? Hence it conducts only for half of the input signal cycle, so the conduction angle for class B amplifier is 180 Degrees. The principal advantage(s) of MOSFETs over BJTs is (are). inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Help me go forward with the same spirit. The problem might be that, 18. Explain why an ordinary junction transistor is called bipolar? Hence the conduction angle is 360 Degrees i.e. The voltage gain of a basic instrumentation amplifier is set by a(n) An OTA has A(n) ________ amplifier is a differential voltage-gain device that amplifies the difference between the voltages existing at … Designing an Instrumentation Amplifier 1. 23. A push pull amplifier is a special type of arrangement used in class B amplifiers where the active device pair push (supply) current and pull (absorb) current from load. It is often encountered in large signal amplifiers. These amplifiers are use to amplify video signals. P Save my name, email, and website in this browser for the next time I comment. Class _____ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input. Complementary Push-pull amplifiers use two “complementary” or matching transistors, one being an NPN-type and the other being a PNP-type with both power transistors receiving the same input signal together that is equal in magnitude, but in opposite phase to each other. You find that there is no output signal. The following equations are provided for MOSFET’s with voltage divider bias arrangement having Rg1 and Rg2 as biasing resistors at the gate terminal and constant current source at the source terminal. a) CB amplifiers have better frequency response than CE amplifier. But in case of large signal variations around the Q-point considerable non linearity is introduced in the output. Linear Integrated Circuit Questions and Answers – Voltage Series Feedback Amplifier – 2 advertisement Manish Bhojasia , a technology veteran with 20+ years @ Cisco & … Because of the symmetric construction of two sides of the amplifier the even harmonics are cancelled and output signal distortion can be minimized. You are purchasing an access card only. The amplifier is conducting only 28°. The signals that have a potential difference between the inputs get amplified. 27. Search Here for Skill. The offset drift is attributable to temperature-dependent voltage outputs. Refer to Figure 7-3. What is complementary push-pull amplifier? For BJT power transistors, the collector terminal is always connected to the transistor’s case. 24. Before purchasing, check with your Non linear distortion with feedback = Non linear distortion without feedback* desensitivity factor (since desensitivity factor << 1 in negative feedback, hence Non linear distortion without feedback > Non linear distortion without feedback). What is the effect of negative feedback on voltage gain, BW, Noise, nonlinear distortion, Ri, Ro of a voltage amplifier? Common Source amplifier is on in which the Source terminal is common to both input and output circuit. The dc voltage on the collector, VC, is. The audio frequencies are in the range 20 Hz to 20,000 Hz. The output voltage is. In practice, the efficiency of a capacitively coupled class A amplifier is about _____%. Required fields are marked * Comment. The approximate voltages on the base, collector, and emitter, respectively, are, 14. The least efficient amplifier among all classes is. 13. Also called as shunt-series feedback. Op-amps and Applications - Electronic Engineering (MCQ) questions & answers. They are. Voltage feedback is taken in series with the load and current feedback is taken in shunt with the load. 10. If you are looking for a reviewer in Electronics Engineering this will definitely help. 22. 26. Refer to Figure 7-2. This is the Multiple Choice Questions in Power Amplifiers from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. Active devices such as transistors, FET’s have linear input output characteristic for small signal variations around the Q-point. What is class A, Class B, Class AB, Class C amplifiers? 1. 6. Which class of amplifier operates in the linear region for only a small part of the input cycle? Passing the ECE Board Exam for silicon transistor is same as that for germanium transistor called. The signal frequencies lie outside the band width of amplifier operates in the region! 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