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Isolation amplifier objective questions for a test

The Candidates who are applying for ITI Instrument Mechanic vacancies, need to start their preparation as early as possible to gain the right marks in the exam. Which among the following is a passive device? Which among the following is a discontinuous mode controller? The equivalent resistance of 2 ohm and 3 ohm resistors when connected in parallel is: A 1. A change of pH value of 1 unit represents a change of hydrogen ion concentration by a ratio of A 0.


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WATCH RELATED VIDEO: L22: Operational Amplifier: 100 Questions for GATE, ESE \u0026 ISRO-2020 - Analog Electronics

Electronics - Special-Purpose Op-Amp Circuits


An open-loop ideal op-amp configuration is as shown:. CMRR Common mode rejection ratio is defined as the ratio of differential-mode voltage gain A d and the common-mode voltage gain A c. Ideally, the common-mode gain of the Op--Amp should be zero.

We know, that the sinusoidal signal is positive for the one-half cycle and negative for another half cycle. Hence, the output will be a square wave. For voltage follower, R f is 0. Instrumentation Amplifier :. An instrumentation amplifier is usually employed to amplify low-level signals, rejecting noise and interference signals.

Therefore, the characteristics of a good Instrumentation amplifier should include:. 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. High Input Impedance : To avoid the loading of input sources, the input impedance of the instrumentation amplifier must be very high ideally infinite.

Low Output Impedance : The output impedance of a good instrumentation amplifier must be very low ideally zero , to avoid loading effect on the immediate next stage. High CMRR : The output from the transducer usually contains common-mode signals, when transmitted over long wires. A good instrumentation amplifier must amplify only the differential input, completely rejecting common-mode inputs. Thus, the CMRR of the instrumentation amplifier must be ideally infinite. High Slew Rate : The slew rate of the instrumentation amplifier must be as high as possible to provide maximum undistorted output voltage swing.

The circuit shown is connected in Non inverting opamp amplifier circuit. Output voltage V 0 of the circuit shown in figure below. In an Op-Amp inverting amplifier, the pin 2 of IC is at virtual ground. This statement is based on which law? If we apply the input at this terminal the output will not have any phase shift at the output. The ideal opamp will be having virtual ground and the current entering the op-amp will be 0.

IC is a microprocessor programmable electronics chip. A single IC has a decision-making capability similar to that of a CPU present in mobile phones, washing machines, radars, satellites, etc. The IC timer is an integrated circuit used in a variety of timer, pulse generation, and oscillator applications. Start Learning. Universal multivibrator Astable multivibrator Bistable multivibrator Monostable multivibrator.

A Schmitt trigger is basically an inverting comparator circuit with positive feedback. The function of the Schmitt trigger is to convert any regular or irregular shaped input waveform into a square wave output voltage or pulse. The circuit is named a "trigger" because the output retains its value until the input changes sufficiently to trigger a change.

In the non-inverting configuration, when the input is higher than a chosen threshold, then output is high. When the input is below a different lower chosen threshold, then output is low, and when the input is between the two levels, then output retains its value. This dual-threshold action is called hysteresis and implies that the Schmitt trigger possesses memory and can act as a bistable multivibrator latch or flip-flop. Get Started for Free Download App.

An ideal op-amp has the following characteristics: Infinite open-loop gain A Infinite input impedance R in Zero input offset voltage.

Infinite output voltage range. Infinite bandwidth with zero phase shift and infinite slew rate. Infinite input impedance Zero output impedance Infinite bandwidth All the above. As large as possible Close to zero Close to unity As small as possible.

Sine Square Singular Sawtooth. The ground voltage at the inverting input terminal. Infinity Zero Unity Less than unity. Voltage Follower: A voltage follower is an op-amp circuit whose output voltage straight away follows the input voltage.

The Op-amp circuit does not provide any amplification thus, its voltage gain is unity. The voltage follower is used as a buffer amplifier, isolation amplifier, unity gain amplifier as the output follows the input.

The voltage follower provides no alternation or no amplification but only buffering. Slew rate is the maximum rate of change of output voltage with respect to time. Slew rate limits the maximum frequency of operation of op-amp The slew rate is usually measured in volts per microsecond. Instrumentation Amplifier : An instrumentation amplifier is usually employed to amplify low-level signals, rejecting noise and interference signals. Therefore, the characteristics of a good Instrumentation amplifier should include: 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.

Low Power Consumption : A good Instrumentation amplifier have low input offset currents and therefore has very low power consumption which is always a desirable property.

Concept: The circuit shown is connected in Non inverting opamp amplifier circuit. Calculation: A grounded base transistor acts like a normal PN junction Diode. Schmitt trigger blocking oscillator multivibrator Wein bridge oscillator. Schmitt Trigger : It is a comparator circuit with positive feedback. In this, input sine-wave is converted to a square wave. The output voltage changes its states whenever the input voltage exceeds certain voltage levels i. Zero Infinite Low Medium.

Answer Detailed Solution Below Option 3 : both a. An operational amplifier is a very high gain voltage amplifier.

It is used to amplify the signals by increasing its magnitude. Op-amps can amplify both DC and AC signals. Answer Detailed Solution Below Option 3 : Applying KVL we get. Answer Detailed Solution Below Option 1 : The pin diagram is shown below: Pin 2 and 3 are input terminals.

Non-inverting terminal : If we apply the input at this terminal the output will not have any phase shift at the output. Here we are discussing the voltage and in a loop, it will be zero.

Reducing the amplitude of the input voltage. IC is a voltage regulator with output fixed at 5 V. Exam Preparation Simplified Learn, practice, analyse and improve. Testbook Edu Solutions Pvt. Our Apps. Characteristics Parameter. Practical value. Common mode rejection ratio CMRR.


Basic Electronics Engineering Test Questions Set 10

For the Op-Amp circuit shown in the figure, V o is:. The voltage gain of a negative feedback op-amp, with input at the inverting terminal, is given by:. And the voltage gain of a negative feedback op-amp with input at the non-inverting terminal is given by:. Using superposition, first the voltage gain because of the voltage at the inverting terminal will be:. The voltage gain A v for an amplifier is defined as the ratio of the output voltage to the input voltage, i.

This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Electronic Amplifiers”. 1. What is the Common Mode Rejection.

Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier )


Inst Tools. Measurement and Instrumentation Objective Questions. The decibel is a measure of. Power gain in decibels is equal to voltage gain in decibels only when. An ideal amplifier has. Fidelity represents. If the current gain of the amplifier is X, its voltage gain is Y, then its power gain will be.

Isolation amplifiers are also called as

isolation amplifier objective questions for a test

When the initial slope of a sine wave is greater than the slew rate A Distortion occurs B Linear operation occurs C Voltage gain is maximum D The op amp works best Answer: Distortion occurs. The input offset current is usually A Less than the input bias current B Equal to zero C Less than the input offset voltage D Unimportant when a base resistor is used Answer: Less than the input bias current. The typical input stage of an op amp has a A Single ended input and single ended output B Single ended input and differential output C Differential input and single ended output D Differential input and differential output Answer: Differential input and single ended output. For an Op-amp with negative feedback, the output is A equal to the input B increased C fed back to the inverting terminal D fed back to the non inverting terminal Answer: fed back to the inverting terminal. When the two input terminals of a diff amp are grounded A The base currents are equal B The collector currents are equal C An output error voltage usually exists D The ac output voltage is zero Answer: An output error voltage usually exists.

This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the Operational Amplifier topic. An operational amplifier also called OP-Amp and is a basic building block of analog-type electronic circuits.

Why Use Isolated Signal Conditioners


A silicon controlled rectifier SCR is a. Show Explanation. Silicon controlled rectifier or semiconductor-controlled rectifier is a four-layer solid-state current-controlling unidirectional devices i. Silicon is used as the intrinsic semiconductor, to which the proper dopants are added. The junctions are either diffused or alloyed an alloy is a mixed semiconductor or a mixed metal.

ITI Instrument Mechanic Questions and Answers

Solved examples with detailed answer description, explanation are given and it would be easy to understand. Here you can find objective type Electronics Special-Purpose Op-Amp Circuits questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided. You can easily solve all kind of Electronics questions based on Special-Purpose Op-Amp Circuits by practicing the objective type exercises given below, also get shortcut methods to solve Electronics Special-Purpose Op-Amp Circuits problems. All Rights Reserved.

Get Op-Amp and Its Applications Multiple Choice Questions (MCQ Quiz) with The voltage follower is used as a buffer amplifier, isolation amplifier.

300+ TOP ELECTRONICS & INSTRUMENTATION Objective Questions and Answers pdf

This can be achieved by replacing the diode by a DIAC bidirectional diode. Isolation transformer provides the supply to the amplifier and also provides the necessary isolation for the load and triggering circuit. It is not suitable of RL load because initiation of SCR conduction is not well defined in these types of loads. Welcome Back.

In this section of Electronic Devices and Circuits. This Section covers below lists of topics :. What is true about the breakdown voltage in a zener diode? It decreases when current increases. It destroys the diode. It equals the current times the resistance.

In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well:. When a differential amplifier is operated single-ended, ………….

This ratio is sometim es referr ed to as the po st detector. In electronics, signal conditioning is the manipulation of an analog signal in such a way that it meets the requirements of the next stage for further processing. Question 1. Question 2. Please send a message and a representative will contact you shortly.

These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries. View Answer. Go To Download Page Close.




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