11. A feedback amplifier is also called as
A. Open-loop amplifier
B. Closed-loop amplifier
C. Feedback network amplifier
D. Looped network amplifier
12. How many types of configurations are available for feedback amplifiers?
A. Six
B. Four
C. Two
D. Eight
13. Which of the following is not a feedback configuration?
A. Current-series feedback
B. Voltage-shunt feedback
C. Current-Voltage feedback
C. Current-Shunt feedback
14. When load current flows into the feedback circuit, the configuration is said to be
A. Current-shunt feedback
B. Voltage-shunt feedback
C. Voltage-series feedback
D. All of the mentioned
15. On what criteria does the feedback amplifier are classified?
A. Signal fed back to the input
B. Signal applied to an input
C. Signal fed back to an output
D. None of the mentioned
16. The closed-loop voltage gain is reciprocal of
A. Voltage gain of an op-amp
B. Gain of the feedback circuit
C. Open loop voltage gain
D. None of the mentioned
17. Select the specifications that implies the inverting amplifier?
A. V1 = -3v, V2 = -4v
B. V1 = -2v, V2 = 3v
C. V1 = 5v, V 2 = 15v
D. V1 = 0v, V2 = 5v
18. 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
19. 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
20. 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
21. 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
22. 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