The Following Section consists of Multiple Choice Questions on Basic Op-Amp Circuits. Explanation: Inverting amplifiers are generally categorized in the form of summing amplifier, Scaling amplifier and averaging amplifier. On the controversial aspect, summing amplifier generates the output voltage which is equal to negative summation of all inputs times the circuit gain. Due to this reason, the output gets switched between the positive and negative saturation levels. Loop gain should be unity; Loop gain should be less than unity; The phase of a feedback signal with respect to input should be 0° or 360° The most probabilistic approach of hysteresis occurrence can be observed in the comparators with positive (or regenerative) feedback. What are differential gain and common-mode gain of a differential amplifier? The resistance value decreases with an increase in the intensity of incident light & hence the typical value of resistance of photo-conductive cells is absolutely 100 ohm. Explanation: Given data:Voltage Peak Value = 7mVFrequency = f = 1KHzR = 1500K Ω C = 2μF = 2 x 10-6 FAn input voltage equation of a differentiator circuit can be expressed by, V1 = Asin2 πft= 7 sin2π x 1000 t= 7 sin2000π t mVScale Factor = -CR = - [2 x 10-6 x 15 x 105] = - [30 x 10-1 ] = -3Hence, the output voltage of differentiator circuit can be evaluated as:Vo = -3 d / dt [7 sin 2000 π t]= -3 x 7 x 2000 cos 2000 π t= -42000 π cos 2000 π t mV. Explanation: Photo-conductive cells can be categorized under the family of photo-detectors which shows variation in the resistance due to incidence of light or any other form of radiant energy. Hence, this scaling amplifier is also referred as 'Weighted Amplifier'. However, the value of external resistor has an efficiently high value to swamp the consequences of emitter resistor of amplifier. These short solved questions … The significant advantage of hysteresis is that it increases the speed of operation of the comparator. As a result, bandwidth reduces the output voltage when it is exceeded. ... c. IC LM 117 d. IC 741. However, only the case of A & C is application from the integrator point of view. Higher the value of quality factor, more is the selectivity of the filter. Since clipping circuit eliminates the positive parts of input signal, so the the value of reference voltage helps in determining the clipping level. Explanation: External resistor of a differential amplifier is connected in series combination with each emitter. Harikesh Yadav May 30, 2017 ECE MCQ PDF, General. Explanation: Comparator is a circuit which performs comparison between the signal voltage on one input of Op-amp with reference voltage on another input. This is the Multiple Choice Questions in Operational Amplifiers from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. In the following circuit, IC 741 operational amplifier is used as a comparator. Explanation: All-pass filters allows to pass all the frequency components of input signal without any attenuation by anticipating phase shifts for different frequencies. However, response & conversion time are not the valid specifications for DAC selection since they are of significant importance in ADC. 38) Which Op-amp IC … 2: Image showing Output from LM741 OPAMP IC based RC Phase Shift Sine Wave Oscillator on an … Electronic Engineering (MCQ) questions & answers, Digital Signal Processing Test Questions Set - 3, Digital Signal Processing Test Questions Set - 2, Digital Signal Processing Test Questions Set - 1, VLSI Design & Technology Test Questions Set - 3, VLSI Design & Technology Test Questions Set - 2, VLSI Design & Technology Test Questions Set - 1, Embedded Processors Test Questions Set - 2, Embedded Processors Test Questions Set - 1, Optical Fiber Communication Test Questions Set - 3, Optical Fiber Communication Test Questions Set - 2, Optical Fiber Communication Test Questions Set - 1, Information Theory & Coding Techniques Test Set 2, Information Theory & Coding Techniques Test Set 1, Telecommunication & Switching Systems Test Set 2, Telecommunication & Switching Systems Test Set 1, Mobile Communication Test Questions Set 4, Mobile Communication Test Questions Set 3, Mobile Communication Test Questions Set 2, Mobile Communication Test Questions Set 1, Microcontrollers & Applications Test Questions Set. Explanation: For non-inverting mode of an amplifier (voltage series feedback amplifier) 1) Af = AB / 1 + ABBut, B = R1 / (R1 + Rf) = 2 k / (2 k + 20 k) = 1 / 111 + AB = 1 + 400000 x (1 / 11) = 36364.6 Af = 400000 / 3636.4 = 10.99 2) fF = (1 + AB) fo = (36364.6) x 10Hz = 363646 = 36.36 KHz. Hence, both the shortcomings can be resolved by using positive or (regenerative) feedback. Thus, the interval between input step function & the duration of crossing logic threshold voltage at the output gives the conceptual idea of response time. Resistances of photo-conductive cell are noted along with the corresponding light intensities & then the resistances are expressed in terms of ohm while the light intensities are expressed in terms of meter candles (lux). This process is known as the biasing amplifier and it is an important amplifier design to establish the exact operating point of a transistor amplifier which is ready to re… Narrow band-reject filter is commonly known as notch filter since it has high quality factor (Q>10) & bandwidth is very much smaller as compared to that of wide band-reject filters. When signals undergo transmission by telephone wires, there is a definite change in phase. When an amplifier is overdrive output waveform of voltage and current distortion. Explanation: Op-amp ICs varying in the version of 741 are highly approved or sanctioned for military grade since the temperature range lies within -55° to 125°C. Explanation: By taking into consideration the approach of application point of view, selection of an efficient digital to analog converters must have good specifications in terms of resolution, linearity or non-linearity of error, Gain & offset errors along with the settling time. The op-amp can be corrected easily to compensate for temperature changes. This figure of merit conveys that if 'Q' > 10, the filter is considered to be a narrow band-pass filter whereas if 'Q' < 10, then the filter is considered as a narrow band-pass filter. All Rights Reserved. Apart from this, average circuit produces the output voltage by considering the average of all input voltages. Besides these, 741S & 741SC are recommended for military as well as commercial aspects due to high slew rate. Basically, each input voltage gets amplified by a different factor & then weighted differently at the output level. Therefore, quality factor is a measure of selectivity which infers that the selectivity of the filter depends on the value of 'Q'. It is an 8 pin IC. However, this type of transistor array ultimately leads to acquire the thermal stability and the requisite amount of collector current in a current mirror circuit.Due to simplicity in fabrication and operation, current mirror circuit have wide range of applications in the aspects of differential and operational amplifiers. Explanation: Temperature control circuit can be built up by using a thermistor in bridge circuit along with the replacement of a meter by a relay in the structural configuration of differential instrumentation amplifier. Can we use IC 741 for high frequency applications? When the difference of … Frequency Scaling is most oftenly performed whenever there is a necessity to change the cut-off frequencies in filter designing process. 7. Whenever there is an application of signal to input of only one op-amp, then some of the other signal appears on the output confined level of other op-amps due to physical vicinity of op-amps in dual and quad form of packages.However, the amplitudes of all these signal are almost similar and therefore, can be evaluated with an assistance of channel separation. Capacitor discharge interval in monostable circuits is known as (a) refresh time (b) recovery time (c) dynamic time (d) static time Q3. Hence, this is the major drawback because of which it is highly impossible to use Op-amps with open loop configurations in linear circuit applications. MCQ Estimating MCQ Fertilizer Tech MCQ Fluid Mechanics MCQ Furnace Tech. No, IC741 has a low slew rate. The evaluation of the test taken by a candidate will be provided on line after submission of the answer of last question.Duration of The Test- 18 minutes**Note- This test is available only to authorized users.This MCQ is created bySatyajit's ClassesMr. 33.34 - 23.34 = 10 kHz. Intuitively, sensitivity measures the degree of accuracy & resolution. Explanation: Frequency Scaling is a process of conversion of original cut-off frequency to a new cut-off frequency. Q.182.For IC 741 typical value of input bias current is—————-(a) 10μA (b) 80nA (c) 1mA (d) 30mA. A bistable multivibrator is a (a) free running oscillator (b) triggered oscillator (c) sawtooth wave generator (d) crystal oscillator Q2. Thus, manufacturers generally holds the original type number in their own IC designation. However, crystal & LC oscillators find their applications in generation of high frequency signals while RC oscillators are intended for audio-frequency applications. Fig. Explanation: The significant AC parameters of Op-amp are transient response, bandwidth and slew rate but all of them have different results while becoming excessive. Along with that we are also going to learn about the ac equivalent circuit of op amp. Apart from this advantage, external resistor also possesses a beneficiary notion of increasing the linearity range of differential amplifiers. Consequently, some chips have been getting expensive due to students relying too much on one model and manufacturer. b) In the Circuit Given Below, determine the Output Voltage Op-amp 741 Circit problem Choose the letter of the best answer in each questions. Explanation: Sensitivity is basically a dimensionless quantity & implies the change in resistance due to change in length of wire at a unity level. Semiconductor strain gauges are sensitive to maximum extent as compared to that of wire type & hence they yield more accuracy and resolution. If you are looking for a reviewer in … The modern integrated circuit version is typi ed by the famous 741 op-amp. Temperature indicator is also constructed using thermistor as a transducer with the only difference that output meter is calibrated in degree Celsius or Fahrenheit. Multiple Choice Questions and Answers on Oscillators. Explanation: Band-reject filters are those which shows the frequency attenuation in the stop-band while they get passed outside this band. Thus, when the input value falls below lower threshold voltage, then the output gets returned to its original position or state +Vsat. Which among the following is a military grade op-amp IC? An op-amp is a direct coupled high gain … The popular IC 741 … When the initial slope of a sine wave is greater than the slew rate ... Computer Science multiple choice questions … There are two types of op-amp based waveform generators − Square wave generator; Triangular wave generator; This … Hence, they can be sinusoidal if RC components are used while they can be square if LC components are used & even they can be saw-tooth or triangular if crystal oscillator is used. Explanation: Offset minimizing resistors are the only means of reducing the amount of output offset voltage. Therefore, due to the configurational assortments in inverting & non-inverting amplifier, the output voltage & phase level (in or out) also exhibit variations. Explanation: (a) By applying voltage -divider rule, initial voltage at terminal 5 is given by,Vc = (20K) (15) / 11.5K = 26.09 VThus, the frequency of output waveform (nominal frequency) is approximated by,fo ≈ 2(+V - Vc) / R1C1 (+V) = 2 (15 – 10.43) / (20K x 10-9) x (15) = 30.47 kHz (b) Thus, the modulation in the output frequencies can be calculated by initially substituting Vc = 10V & then 11.5 Vfo = 2 (15 – 10) / 20K x 10-9 x 15 = 33.34 kHz fo = 2 (15 – 11.5) / 20K x 10-9 x 15 = 23.34 kHzHence, the variation in an output frequency can be evaluated by the difference between these both frequencies.i.e. Explanation: Silicon steel EI butt stack method shows better permeability & high flux density along with the simplicity in construction phase. Only the scaling or (weighted amplifiers) possesses this characteristic of operation that exhibits different weightages at the output. Several drawbacks related to performance characteristics were highlighted like no protection to short circuits, latch-up problem and absence of external frequency-compensating network for stable operation. Determine the values of load current and output voltage respectively for the below schematic of … Due to this configuration, the dependability of voltage gain which varies in accordance to changes in emitter resistance can be ablated. But, the output voltage is absolutely zero when the input voltage is zero. 1. Thus, all pass filters are the means for compensating these phase changes, because of which they are generally termed as “Phase-Correctors” or “Delay Equalizers”. … Q1. Explanation: Microprocessor interfacing is an application of ADCs while all the remaining applications like microcomputer interfacing, programmable power supply & CRT graphics are the applications concerned to digital to analog converters in accordance to their functionalities. Electronic Engineering (MCQ) questions & answers. The DC Level at the output of intermediate stage is good above ground potential in case of direct coupling. Hence, it is obligatory to use the level shifter in OP-Amps. Op Amp Multiple Choice Questions & Answers for competitive exams. _____ multivibrator is a square wave oscillator. Since bandwidth is a small signal phenomenon, it represents the band of frequencies for which the gain remains constant & also highly dependable on compensating components including closed loop gain. Educational Learning Point having all the articles of multiple subjects/area e.g; Computer Science, Medical, General Knowledge, Law, English, Islamic studies and Others. For an instance, twin-T network. Explanation: The inceptional phase of first generation was initiated with the utility of IC op-amp 709. ANSWER: Adjusted Output from signal amplifier is directly proportional to the measured quantity. Signetics NE/SE 566 VCO generates the triangular as well as square wave outputs simultaneously as a function of an input voltage. Eventually, the parameter of settling time is totally not involved in comparators. © Copyright 2016. For use in various applications, In different ways. There are different types of transistor amplifiers operated by using an AC signal input. 15. ANSWER: IC 741. Hence, it is also regarded as 'Second-generation Op-amp'. In this section of Electronic Devices and Circuits.It contain Operational Amplifiers (OP AMPS) MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs … Some of the general characteristics of the IC version are : – High gain, on the order of a million – High input imp … Explanation: Integrator is basically a circuit where the output voltage forms an integral part of input voltage. A typical summing amplifier with three input voltages V 1, V 2 and V 3 three input resistors R 1, R 2, R 3 and a feedback resistor R f.; The following analysis is carried out assuming that the op-amp is an ideal … Powdered permalloy toroids possess are highly permeable with lower values of leakage inductance & losses. ANSWER: Unit change in R per unit change in 'l'. All these major shortcomings were tackled by an internally compensated op-amp IC741 which had a provision of short-circuit protection, absence of latch-up problem & highly stable & proficient at the operational level. Operational Amplifier : OP-AMP MCQ’s Part 2 Operational Amplifier : OP-AMP MCQ’s Part 2 11. So, as the … Explanation: Non-inverting amplifier has greater output voltage than that of its input voltage & is in phase with it. Jobs in Pakistan, Karachi, … Multiple Choice Questions and Answers By Sasmita January 9, 2020 Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier ) In addition to reading the questions and … It is possible to control the current in the heat-generating circuit with an assistance of relay driven by the temperature controller itself. Explanation: Narrow & Wide band-pass filters can be distinguished only on the basis of quality factor. Therefore, the voltage difference 'Vref' must be smaller than input voltage. Here, the diode gets formed with an assistance of transistors placed adjacently. Q2. Explanation: No explanation is available for this question! In case of non-inverting amplifier, the input is applied to non-inverting input terminal & inverting terminal is set to be grounded while in case of inverting amplifier, the input is applied to inverting terminal & non-inverting terminal is at ground level. Many amplifiers have a slight output voltage due to temperature changes in the components. Despite bridge circuits, light-intensity meter can be built-up by using a photocell as a transducer while two thermistors are adjacently connected in thermal conductivity meter circuits. Explanation: An ideal Op-Amp has an infinite CMRR, Slew Rate & Bandwidth. Which are interchanged between the positive value and negative value, hence this is the one way of presenting the common emitter amplifier circuit to function between two peak values. But, it exhibits adverse consequences in the reduction of an output voltage when exceeded to greater extent. ELECTRONICS IMPORTANT MCQ PDF 6 FOR BEL PROBATIONARY ENGINEERS EXAM 2017. Explanation: The leading role of an instrumentation amplifier signifies is the amplification & magnification of low level signals in order to drive the display or an indicator. The IC 741 operational amplifier is used in two methods such as an inverting (-) and a non-inverting (+) The IC 741 Op Amp applications mainly includes an adder, comparator, subtractor, voltage follower, Integrator and differentiator.The circuit diagram of IC 741 op amp is given below. 1. There is a capacitor withinor outside of an op-ampto prevent oscillation. IC LF 398 forms a leading part of sample & hold circuit while IC LM117 can be used as a switching regulator & also provides full overload protection to other ICs. The cardinality of differential amplifier can be most probably seen in industrial & instrumentation aspects due to superior ability of rejecting common mode noise voltages. Prerequisite: Know the theory about the experiment. Here, the frequency gets converted & not deviated or translated or divided before the conversion process. So, it is wide used in low-voltage switching regulators. When Vin Vref, then reference voltage is higher at the negative input as compared to that of the positive input. On the contrary, the output voltage of inverting Op-amp goes out of phase in correspondence to input signal by an angle of 180° or in terms of opposite polarity. Explanation: Structural Configuration of a differential amplifier is semantic to wheatstone bridge since the amplification is done between two input signals in exactly similar way just like the outputs of Wheatstone bridge network. Q.183.For IC 741 typical value of input offset current is—————- ... ELECTROMAGNETIC FIELD THEORY 69 IMPORTANT EXPECTED MCQ …
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