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What is op amp and its application?

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Description : What is the gain of an op amp?

Description : State principle of operation of piezo-electric transducer. State its application.

Answer : The piezoelectric element used for converting mechanical movement into electric signals. The mechanical deformation generates charges and this charge appears as a voltage across the electrodes.  ... destructive test (NDT) equipments 6. Piezoelectric materials are used in ultrasonic transducers. 

Description : What is Amorphous metal? Give one application of this metal.

Answer : Amorphous Metals: Amorphous Metals means materials that do not possess a particular structure. Metal alloys typically possess crystalline atomic structure. The atoms are arranged in particular ... cores of special transformers d) Manufacturing magnetic sensors e) Magneto-motive sensors 

Description : What is the application of thyristor?

Description : What are the industrial application of electrolysis?

Answer : Integrated circuit design for particular application is known as Application Specific Integrated Circuit ASIC. ASIC have smaller size, less power consumption and less cost .

Description : What is operational amplifier?

Answer : Operational amplifier is an amplifier which amplifies the input signal when we pass a low voltage signal .It has two terminals inverting and non inverting. It is an active device because it ... of negative feedback it provides the output waveform similar to the input waveform (truely amplified )

Description : Application one lamp controlled from two places

Answer : Application one lamp controlled from two places: 1. For Stair case wiring 2. Hospital Wiring ( For operating the lamp in room and nursing station) 3. Bedroom Lighting. 

Description : List different types of stepper motor. State one application of stepper motor.

Answer : Types of stepper motor : (i)Variable - reluctance motor (ii) Permanent- magnet motors (iii) Hybrid motors. Applications of stepper motor : In robotics, In CNC machines, In computers, printers, ... In Watches, In biomedical applications such as X-ray machines, CT scan, In Process control systems. 

Description : application of CRO.

Answer : Applications of CRO: 1) Voltage measurement. 2) Current measurement. 3) Measurement of phase difference. 4) Measurement of phase. 5) Measurement of frequency. 6) Measurement of inductance. ... in various circuits. 17) For checking transistor. 18) It can measure short time interval.

Description :  application of logic analyzer.

Answer : Digital systems. Computer systems Logic circuits. Testing complex digital

Description : State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Answer : Phase Sequence Indicator:  1. For finding correct phase sequence of supply  2. For obtaining exact instant of parallel operation of alternators.  3. For obtaining reversal of rotation ...  4. In electroplating industries   5. In various processes industries for measuring power factor

Description : Application of Norton's theorem to a circuit yields?

Answer : Application of Norton's theorem to a circuit yields equivalent current source and impedance in series.

Answer : According to application, instruments are classified as switch board, portable.

Answer : Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because it has low starting as well as running currents at relatively high power factor.

Description : Application Specific Instruction Set Processor (ASIP)

Answer : An application specific instruction set processor (ASIP) can serve as a compromise between the general purpose processor and single-purpose processors. An ASIP is a Programmable processor ... fetch sequential data memory locations in parallel with other operations to further speed execution.

Description : Draw the diagram of zero crossing detector using op-amp and explain its working.

Answer : The zero crossing detector circuit is an important application of the op-amp comparator circuit. It can also be called as the sine to square wave converter. Anyone of the inverting or non-inverting ... the possibility of any false zero crossing due to noise voltages at the op-amp input.

Description : What is the Output voltage of Op-amp for input voltage of Vi1=150 μV,Vi2=140 μV if the amplifier has differential gain of Ad=4000 and value of CMRR is 100. 

Answer : i don know

Description : Describe how Op-Amp is used as adder using circuit diagram and output voltage equation.

Answer : Summing Amplifier Circuit In this simple summing amplifier circuit, the output voltage, ( Vout ) now becomes proportional to the sum of the input voltages, V1, V2, V3, etc. Then we can ... to the non-inverting input of the op-amp, it will produce the positive sum of the input voltages.

Description : Why there is decrease in supply voltage with increase in drain current in voltage controlled current source circuit using op amp and mosfet?

Description : Explain the function of sample and hold circuit by using op-amp.

Answer : sample and hold circuit by using op-amp The n-channel MOSFET is driven by a control voltage VC acts as a switch. The control voltage VC is applied to the gate of the MOSFET ... called sample period. The time period during which the voltage across capacitor is constant is called Hold period.

Description : Draw and explain the Op-amp based subtractor

Answer : Working The subtractor circuit is a basic op-amp circuit whose output voltage is the difference between two input voltages.  In the above circuit, the two input voltages are V1 and V2.  The op amp is used ... When differential gain is 1, ie Rf = R,  the output voltage is Vo = (V2 - V1).

Description : Output of an op-amp is a square wave of 4 V peak to peak with a rise time of 5 microsecond and fall time of 4 microsecond.Maximum frequency (in kHz)of undistorted sine wave output of 2 V peak to peak is about  A) 100 B) 150 C) 200 D) 250

Description : A dominant pole compensated op-amp has openloop gain of 100 dB and -3 dB bandwidth of 50 Hz. If it is connected as inverting amplifier for a gain of 20 dB the -3 dB bandwidth is about  A) 500 kHz B) 50 kHz C) 5 kHz D) 500 Hz

Description : Draw pin diagram of Op-Amp IC-741.

Answer : Pin diagram of Op-Amp IC-741 :

Description : Describe the concept of virtual ground with reference to op-Amp.

Answer : Virtual ground concept:-In circuit point A is virtual ground. Figure shows inverting amplifier using op-amp. In this circuit non-inverting terminal is connected to the actual ground. Due to ... zero potential without actually grounding is known as virtual ground concept. Circuit diagram: 

Description : Block Diagram of op-Amp

Answer : Block Diagram: The OP-AMP is basically a different amplifier i.e. it will amplify the voltage which is differentially present between its input terminals.  1.Input stage: The ... normally a complementary output stage. It increases the OPAMP. It also provides a low output resistance. 

Description : Define the following terms related to Op-Amp: i) CMRR ii) SVRR

Answer : Definition:- i) SVRR: It is defined as the ratio of change of input offset voltage to the change in one supply voltage while keeping other supply voltage constant. Ideally,SVRR=0  ii)CMMR:-The ... gain should exceed common-mode gain, this will be a positive number, and the higher the better.

Description : State any two characteristics of an ideal Op-amp.

Answer : Characteristics of Op-amp: i) Input offset voltage ii) Input offset current iii) Input bias current iv) Differential input resistance v) Input capacitance vi) CMRR-common mode rejection ration vii) ... voltage rejection ratio(SVRR) viii) Output resistance ix) Voltage gain x) Bandwidth xi) Slew rate

Description : An Op-amp as a voltage follower has a voltage gain of

Answer : An Op-amp as a voltage follower has a voltage gain of Unity

Description : The input impedance of an op-amp is • High • Low • Medium • None of the above

Answer : The input impedance of an op-amp is High

Description : An OP-AMP can be classified as  1.Linear amplifier 2.Low - Rin amplifier 3.Positive - feedback amplifier 4.RC - coupled amplifier 

Answer : An OP-AMP can be classified as Low - Rin amplifier

Description : In op-amp operation, Common Mode Rejection Ratio (CMRR)

Answer : In op-amp operation, Common Mode Rejection Ratio (CMRR) is desired to be high

Description : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip

Answer : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation

Description : An OP amp has an open loop gain of 1,00,000. If the feedback fraction is 0.02, the approximate closed loop gain is (a) 1 (b) 1,00,000 (c) 50 (d) 0.02

Answer : The closed loop gain Ag = G/(1+G*f) Where G is the open loop gain and f is the feedback fraction  So Ag = 49.975

Description : An OP amp has a slew rate of 1V/µs. At a signal frequency of 0.1 MHz, the maximum undistorted sine wave amplitude is (a) 8V (b) 4.82 V (c) 2.02 V (d) 1.592 V

Answer : Slew rate = 2πfv where v is the amplitude V=(1/2π*0.1) = 1.592V

Description : The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -  a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the ... inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

Answer : The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : - is depending upon the fact whether the input is connected to inverting or non -inverting terminal

Description : The input voltage to an OP AMP is a large voltage step. The output is an exponential waveform that changes to 0.25 V in 0.1µs (microsecond). The slew rate of the OP AMP is : -  a) 5V/µs b) 2.5 V/ µs c) 3V/µs d) 4.5V/ µs

Answer : The input voltage to an OP AMP is a large voltage step. The output is an exponential waveform that changes to 0.25 V in 0.1µs (microsecond). The slew rate of the OP AMP is : - 2.5 V/ µs

Description :  In an electronic ohmmeter an op -amp is used as a: -  a) sommer b) multiplier c) buffer amplifier d) integrator

Answer :  In an electronic ohmmeter an op -amp is used as a: -  buffer amplifier

Description : An ideal Op Amp has  (a) infinite input and output impedance (b) very low input and output impedance (c) low input impedance and very high output impedance (d) infinite input impedance and zero output impedance

Description : An op-amp can be represented by  A) Norator at input and Nullator at output B) Norator at output and Nullator at input C) Norator at input and output D) Nullator at input and output

Description : The type number CA3741 operational amplifier(op-amp) is manufactured by  A) RCA B) Texas instruments C) Signetics D) Motorola

Description : An op-amp having a slew rate of 62.8 V/msec, is connected in a voltage follower configuration. If the maximum amplitude of the sinusoidal input is 10 V, then the minimum frequency at which the slew rate limited distortion would set in at the output is  (A) 1 MHz (B) 6.28 MHz (C) 10 MHz (D) 62.8 MHz

Answer : In an op-amp differentiator the amplitude of output is proportional to rate of change of input.

Answer : If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will Be virtual ground.

Answer : A non inverting closed loop op amp circuit generally has a gain factor Greater than one.

Answer : An ideal Op-amp is an ideal voltage controlled voltage source.

Description : What has the most energy in its chemical bonds? a) AMP b) ADP c) ATP d) All are equal 

Answer : ANSWER: C -- ATP

Description : Draw the circuit diagram for Instrumentation amplifier using three OP-AMPs. State its advantages and applications.

Answer : Application: 1. In Data acquisition from low output transducers such as strain gauges, Thermocouples, Wheatstone bridge measurements e.t.c 2. In Medical instrumentation, Navigation, Radar ... video data acquisition and imaging 5. High frequency signal amplification in cable RF systems 

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