Operational Amplifier – 1 – 4

16. For an OP-amp with negative feedback, the output is …….

(a) equal to the input
(b) increased
(c) fed back to the inverting input
(d) 
fed back to the non-inverting input

ANSWER

EXPLANATION

17. The use of negative feedback …….

(a) reduces the voltage gain of an OP-amp
(b) makes the OP-amp oscillate
(c) 
makes linear operation possible
(d) a and b

ANSWER

EXPLANATION

18. Negative feedback ….

(a) increases the input and output impedances
(b) increases the input impedance and bandwidth
(c) decreases the output impedance and bandwidth
(d) 
does not affect impedance or bandwidth

ANSWER

EXPLANATION

19. A certain non-inverting amplifier has Ri Of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is ….

(a) 100,000
(b) 1000
(c) 101
(d)
 100

ANSWER

EXPLANATION

20. If feedback resistor in Q.15 is open, the voltage gain ………..

(a) increases
(b) decreases
(c) is not affected
(d) 
depends on R

ANSWER

EXPLANATION

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