Electrical Engineering: Principles & Applications (7th Edition)
7th Edition
ISBN: 9780134484143
Author: Allan R. Hambley
Publisher: PEARSON
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Given the four statements below, which of the following statements are true about op-
amp with negative feedback arrangement?
i. Negative feedback drive the op-amp to saturation with Vo =+Vsat.
1i. Negative feedback reduces the gain of the op-amp circuit to desired valuc.
iii. Negative feedback controls the frequency response of the op-amp cireuit.
iv. Negative feedback maintains the oscillations.
O, ii, i
Oi, ii, iv
Help me with the following multiple choices questions :
1.Current cannot flow to ground through ______
A.an ordinary ground
B.a virtual ground
C.a mechanical ground
D.an a.c ground
2.For an OP-amp with negative feedback, the output is ....
A. fed back to the noninverting input
B. fed back to the inverting input
C.equal to the input
D.increased
3.
A certain inverting amplifier has a closed loop voltage gain of 25. The OP-amp has an open-loop voltage gain of 100,000. If an OP-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain________
A. remains at 25
B. doubles
C. increases slightly
D. drops to 12.5
1. The virtual short is applicable
A. If one of the input is tied to the ground
B. Only if there is a feedback
C. All the time
D. Depending on the components used
2. What ideal characteristic of Op-Amp contributes to the Virtual Short concept?
A. Zero Ohm Input Resistance
B. Zero Ohm Output Resistance
C. Input terminals do not let current to flow
D. Infinite gain
3. Op-amp closed loop gain varies
A. True
B. Depending on the resistor values used
C. Not applicable
D. False
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- Given the four statements, which of the following statements are not true about the operation of an op-amp? i. Op-amp's close loop operation employs negative feedback that takes portion of the output and applics it back out of phase with the input. 11. In an op-amp, amplification of the common input signals is much less than that of the opposite input signals. iii. In open-loop operation, the output of the op-amp is driven to saturation with Vo = +Vsat. iv. Op-amp's close loop operation employs positive feedback that takes portion of the output and applics it back out of phase with the input. O i, ivarrow_forwardGiven the four statements, which of the following statements are not true about the operation of an op-amp? i. Op-amp's close loop operation employs negative feedback that takes portion of the output and applies it back out of phase with the input. 1i. In an op-amp, amplification of the common input signals is much less than that of the opposite input signals. iii. In open-loop operation, the output of the op-amp is driven to saturation with Vo- +Vsat. iv. Op-amp's close loop operation employs positive feedback that takes portion of the output and applies it back out of phase with the input. O i, iii, iv O i, iv O i i, ii O i, ivarrow_forwardSuppose that we are designing an amplifier, using an op amp. What problems are associated with using very small feedback resistances? With very large feedback resistances?arrow_forward
- Q. One advantage of having feedback in op amp circuit is A. low gain B. low bandwidth C. can control gain D. high output voltage E. less input signal F. less complicatedarrow_forwardActivity 2:You are asked to examine the performance of three op-amp circuits. 2-A) Categorize the circuits in terms of using a feedback or not, and the specific type of thefeedback connection (positive or negative, shunt or series, voltage or current).2-B) Explain the principle of operation of Circuit A. Explain limitations of this circuit in termsof practical applications. What is the technical name describing this circuit?2-C) Explain the principle of operation of Circuit B. What is the advantage of this circuitcompared to Circuit A? What is the technical name describing this circuit?2-D) Explain the principle of operation of Circuit C. What is the advantage of this circuitcompared to Circuits A and B? What is the technical name describing this circuit?2-E) Draw the block diagram of Circuit C and define the forward path gain A and feedbackpath gain β. Derive the overall circuit gain relating input to output.2-F) Build all circuits in MultisimTM using one ‘uA741CP‘op-amp IC fed by…arrow_forwardFirst order control system and response closed loop feedback control first order system with the a Suppose a plant in system is modelled as a transfer function defined below: Gar (s) ((s)/R(s) (5+2) / (5+5) @Sketch the control system diagram showing the input signal r(t), controller Gr(s), plant Gr (s), output signal CHY and unity feedback. Sketch the zero-pole diagram of the system. Ⓒ find the output response c(t) 의 step input ult) is applied to the system... he system if 16 a unit Ⓒ Which component of the system response c(t) is the forced response for the steady state and which part the natural response (or transient state). ⒸFind the sampling frequency and period that must be selected for this system to meet a sensor delay of 0.025sarrow_forward
- 3. Inverting Amplifier is a normal OP-Amp in which the output is given as feedback with a feedback resistor. i. Draw a circuit diagram for the inverting amplifier. Derived the expression for the closed loop gain for the inverting amplifier. iii. In an inverting amplifier input resistance (R1) =2.2 k2 and feedback resistance 220kN. Calculate the closed loop gain for the inverting amplifier.arrow_forwardAssume that the R2/R1 ratio of a feedback amplifier with voltage supply of +/- 10 V is 3.4 and that a value of 8.5 V is applied to the inverting input of the op-amp. What is the output voltage value?arrow_forwardWhat is positive feedback and negative feedback with diagram?arrow_forward
- A negative voltage feedback amplifier has voltage gain without feedback, A, = 1000 and feedback fraction m, = 0.01. If the lower cutt-off frequency f₁ = 1.5 kHz and upper cut-off frequency ₂ = 501.5 kHz before feedback, what is the value of lower cutt- off frequency after negative feedback?arrow_forwardAn op amp with open loop voltage gain of 104 and poles at 105 Hz, 106 Hz, and 107 Hz, is to be compensated by the addition of a fourth dominant pole to operate stably with unity feedback factor 3 = 1.6. i) Find the frequency of the required dominant pole. ii) Find the loop gain.arrow_forwardOp-Amps with no feedback has a gain of ? a. 5 b. zero c. infinite d. 10arrow_forward
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