# What are op amps used for?

Op amp is operational amplifier. Operational amplifier are use in ADC, zero crossing detector ,DAC, filters, Voltage regulators, Current regulators, etc.

## Related questions

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

Answer : 1 op-amp are required to implement this equation Vo = V1.

Description : Used normally, a 150-watt, 120 volt light bulb requires how many amps of current?

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.

Description : How many amps do you need for a house?

Description : A current of 5 amps passes through a 10 ohm resistor. What power is dissipated by this resistor under these conditions?

Description : When two or more successive footnotes refer to the same work which one of the following expressions is used? (A) ibid (B) et.al (C) op.cit : (D) loc.cit.

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 : 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 :  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 : Which of the following iron core electromagnets creates the greatest amount of magnetic flux: w) 1,000 coils, 2 amps of current x) 250 coils, 7 amps of current y) 700 coils, 3 amps of current

Description : A current of 5 amps passes through a 10 ohm resistor. How many joules of energy will be generated by this resistor in 2 seconds?

Description : A copper rod which is 1 centimeter in diameter carries a current of 5 amps. The current is distributed uniformly throughout the rod. The magnetic field half way between the axis of the rod and its ... ) zero. x) pointing radially outward y) pointing radially inward z) circles the axis of the rod

Description : An infinitely long wire carries a current of three amps. The magnetic field outside the wire: w) points radially away from the wire x) points radially inward y) circles the wire z) is zero.

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 : 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 : 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 : 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 : 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

Description : What is the gain of an op amp?

Description : What is op amp and its application?

Description : The order of insects which includes beetles is known as: a) Coleoptera (pron: kO-lee-op-teh-rah) b) Orthoptera (pron: or-tho-op-teh-rah) c) Hymenoptera (pron: high-meh-nop-teh-rah) d) Diptera (pron: dip-teh-rah)

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

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

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

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 : The large d.c. motors used in steel rolling mills are always provided with compensating . windings for (a) opposing the armature mmf (b) maintaining the voltage (c) maintaining the speed (d) none of these

Description : Regulating transformers are used in power systems for control of : a) voltage b) power factor c) power flow d) all of the above

Answer : Regulating transformers are used in power systems for control of :  power flow

Description : Hall effect transducers are generally used for the measurement of (A) Magnetic field (B) Current (C) Electric field (D) Pressure

Description : Pilot relaying schemes are used for the protection of   (a) Bus bars (b) Transformer (c) Instrument transformer (d) Transmission line

Description : Isolators are used for disconnecting a circuit when   (a) Line is energised (b) Line is on full load (c) Line carries no current (d) Can be operated under any condition

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