# The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -

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 input is connected to inverting or non -inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

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

## Related questions

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

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

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 : The sensitivity of a closed loop system to gain changes and load disturbances depends upon (a) forward gain (b) loop gain (c) frequency (d) all the above

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 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 : What is the gain of an op amp?

Answer : The closed-loop voltage gain of an inverting amplifier equal to The feedback resistance divided by the input resistance.

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 : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

Answer : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to inverse of feedback factor

Description : The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

Answer : The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

Description : In the ideal closed loop operational amplifier, the gain depends on (A) value of the series component (B) value of the feedback component (C) on the operational amplifier itself (D) both A and B

Answer : In the ideal closed loop operational amplifier, the gain depends on (A) value of the series component (B) value of the feedback component (C) on the operational amplifier itself (D) both A and B

Description : After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be determined from which of the following criterion ? (A) Magnitude criterion alone (B) Angle criterion alone (C) Both Magnitude and Angle criteria (D) Angle of departure and angle of arrival.

Answer : After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be determined from which of the following criterion ? (A) Magnitude criterion alone (B) Angle ... (C) Both Magnitude and Angle criteria (D) Angle of departure and angle of arrival.

Description : In closed loop control system, with positive value of feedback gain the overall gain of the system will

Answer : In closed loop control system, with positive value of feedback gain the overall gain of the system will decrease.

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

Answer : In a closed-loop system in which the output is the speed of a motor, the output rate control can be used to limit the acceleration of the motor.

Description : Within an organisation, leadership influence will be dependent upon the type of ________ that the leader can exercise over the followers. (a) Power ; (b) friendship ; (c) knowledge ; (d) ... a social process which helps to explain how different people can influence the behaviour/actions of others.]

Description : With respect to a loop in the transportation table, which one of the following is not correct? (1) Every loop has an odd no. of cells and at least 5. (2) Closed loops may or may not b square in ... starting cell, must be occupied cells. (4) Every loop has an even no. of cells and at least four.

Answer : Every loop has an odd no. of cells and at least 5.

Description : An open-loop system is better than a closed-loop system in terms of   (a) Accuracy (b) Stability (c) Noise reduction (d) Sensitivity

Description : As compared to a closed loop system an open loop system is  (a) more stable as well as more accurate (b) less stable as well as less accurate (c) more stable but less accurate (d) less stable but more accurate

Description : An electromechanical closed -loop control system has the transfer function C(s)/R(s) = k/s (s2 + s +1) (s+ 4) +k. Which one of the following is correct?  (A) The system is stable for all positive ... values of k between zero and 3.36 (D) The system is stable for values of k between 1.6 and 2.45

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

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 : What is op amp and its application?

Description : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is  A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts

Answer : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is 50 micro-volt

Description : The theory that individuals act depending upon their evaluation of whether their effort will lead to good performance, whether good performance will be followed by a reward, and whether that reward is attractive ... Equity Theory ; (b) Expectancy Theory ; (c) Empirical Theory ; (d) Outcome Theory

Answer : (b) Expectancy Theory ;

Description : An amplifier has a voltage gain of 50; this gain in dB will be (A) 34 dB (B) 68 dB (C) 41 dB (D) 14 dB

Answer : An amplifier has a voltage gain of 50; this gain in dB will be 34 dB

Description : Contingency theories of leadership are based on the belief that (a) there is no single style of leadership appropriate to all situations (b) there is a single style of leadership ... the interactions between the variables involved in a leadership situation and patterns of leadership behaviour.]

Answer : (a) there is no single style of leadership appropriate to all situations

Description : Adair claims that the effectiveness of a leader is dependent upon meeting ________areas of need within the work group. (a) three (b) four (c) two (d) none of the above [hint: Adair claims ... need to achieve the common task, the need for team maintenance and the individual needs of group members.]