1. Specify the voltage gain of a non-inverting amplifier with feedback amplifier with and without feedback?
A. A= Vo/Vid, AF = Vf/Vo
B. A= Vf/Vid, AF= Vo/Vf
C. A= Vo/Vid, AF= Vo/Vin
D. A= Vf/Vid, AF = Vf/Vin
2. If the feedback voltage and the output voltage are given as 10v and 4v. Find the gain of the feedback circuit in the voltage-series feedback amplifier?
A. 2.5v
B. 40v
C. 3v
D. 6.2v
3. How is the difference voltage calculated in a closed-loop non-inverting amplifier?
A. Vid= Vo – Vf
B. Vid= Vin – Vf
C. Vid= Vo – Vin
D. Vid= Vf – Vin
4. Why the feedback circuit is said to be negative for voltage series feedback amplifier?
A. Feedback voltage is 180o out of phase with respect to an input voltage
B. Input voltage is 180o out of phase with respect to a feedback voltage
C. Feedback voltage is in the same phase with respect to an input voltage
D. Input voltage is in the same phase with respect to a feedback voltage
5. Determine the closed-loop voltage gain from the given circuit. (Where gain of op-amp= 105).
A. 1090.9
B. 9821.43
C. 9166.66
D. 10000
6. Express closed-loop voltage gain (AF) in terms of open-loop gain (A. and feedback circuit gain (B.?
A. AF = A/AB
B. AF = 1+ (A/AB.
C. AF = A/(1+AB.
D. AF = AB/(1+A.
7. Which factor determines the gain of the voltage series feedback amplifier?
A. Open loop voltage gain
B. Feedback voltage
C. Ratio of two resistors
D. Gain of the feedback circuit
8. For the feedback circuit of the voltage series feedback amplifier, find the feedback voltage for the specifications: R1=1kΩ, RF = 10kΩ, and Vo= 25v.
A. 12.5v
B. 22v
C. 0.9v
D. 2.3v
9. What must be the value of external components used in the voltage series feedback amplifier?
A. Less than 1MΩ
B. Less than 10MΩ
C. Less than 100MΩ
D. Less than 0.1MΩ
10. Define the input resistance with feedback for the voltage series feedback amplifier?
A. RIF = (1-AB.
B. RIF = (AB-1)
C. RIF = (1+AB.
D. None of the mentioned
11. When the non-inverting input terminal of an op-amp is equal to that of the inverting input terminal (ideally)
A. a–>∞
B. Vid ≅ 0
C. AF = 1+( RF / R1)
D. All of the mentioned
12. Find the input and output resistance for the circuit shown.
Specification for 741 op-amp : A=400000 ; Ri = 33MΩ; Ro = 60Ω;
RF = 11kΩ; R1 = 2kΩ; Supply voltage = ± 15v; Maximum output voltage swing = ± 13v.
A. RIF = 66MΩ, ROF = 30Ω
B. RIF = 30MΩ, ROF = 6kΩ
C. RIF = 15kΩ, ROF = 50MΩ
D. None of the mentioned
13. The output resistance of the op-amp with feedback is
A. Same as that of the output resistance without feedback
B. Greater than that of the output resistance without feedback
C. Smaller than that of the output resistance without feedback
D. None of the mentioned
14. Find the output current in the voltage series feedback amplifier.
A. io ={ [Vo+(A*Vid)]/Ro}
B. io ={ [Vo-(A*Vid)]/Ro}
C. io =(Vo/Ro)*A
D. io =[A*(Vo-Vid)]/Ro
15. Find the unity-gain bandwidth for the voltage series feedback amplifier?
A. UBG = Afo
B. UBG = AfF
C. UBG = Afo fF
D. UBG = AFfo
16. The bandwidth of a non-inverting amplifier with feedback is equal to
A. fo(AB.
B. fo(AB-1)
C. fo(1+AB.
D. fo(1-AB.
17. How are the saturation voltage specified on the manufacturer’s datasheet?
A. Negative voltage
B. Output voltage swing
C. Supply voltage
D. None of the mentioned
18. What is the formula for total output offset voltage with feedback?
A. Voot = ± Vo/(1+AB.
B. Voot = ± Vsat*(1+AB.
C. VooT = ± Vsat/(1+AB.
D. Voot = ± Vo*(1+AB.
19. Which of the following has the same characteristic as that of the non-inverting amplifier with feedback?
A. Perfect feedback amplifier
B. Voltage follower
C. Perfect voltage amplifier
D. All of the mentioned
20. What is the gain of voltage follower?
A. Gain > ∞
B. Gain –>1
C. Gain <1
D. Gain –>∞
21. Which is preferred to attain higher input resistance and the output amplitude equal to input?
A. Voltage follower
B. Voltage series feedback amplifier
C. Voltage shunt feedback amplifier
D. Inverter
22. Find the input and output voltage in voltage follower circuit?
A. Vin=2v and Vout = 3v
B. Vin=10v and Vout = 11v
C. Vin=9v and Vout = 9v
D. Vin=4v and Vout = 7v
23. Voltage follower is also called as
A. None of the mentioned
B. Non-inverting amplifier
C. Inverting amplifier
D. Normal buffer
24. Find the bandwidth and total output offset voltage of a voltage follower? The following are the specifications for the op-amp 741: A=200000, fo =5hz, and supply voltage =±15v.
A. fF = 1000hz, VooT = ± 7.5µv.
B. fF = 100khz, VooT = ± 7.5µv.
C. fF = 10khz, VooT = ±7.5µv.
D. fF = 1000khz, VooT = ± 7.5µv.