15. The output of a particular OP-amp increases 8 V in 12 µs. The slew rate is ….
(a) 90 V/μs
(b) 0.67 V/μs
(c) 1.5 V/μs
(d) none of these
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
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
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
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
20. If feedback resistor in Q.15 is open, the voltage gain ………..
(a) increases
(b) decreases
(c) is not affected
(d) depends on R
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