Operational Amplifier and Its Applications MCQs

Question 1

Op-amp used as a tuned amplifier has the tuned circuit connected

Accepted Answer

across feedback impedance Zf

Answer

across input

Answer

across series impedance at the input

Answer

across output

Question 2

The output voltage of an OPAM of input voltage of Vil = 150 ftV, Vi2 = 140 pV if the amplifier has a differential gain of Ad = 4000 and the value of CMRR is 100, is

Accepted Answer

45.8 mV

Answer

40.006 mV

Answer

10 ftV

Answer

145 ptV

Question 3

Voltage series feedback (also called series-shunt feedback) results in

Accepted Answer

increase in input impedance and decrease in output impedance

Answer

increase in both input and output impedances

Answer

decrease in both input and output impedances

Answer

decrease in input impedance and increase in output impedance

Question 4

The minimum number of 2-to-1 multiplexers required to realize a 4-to-1 multiplexer is

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 5

The effect of current shunt feedback in an amplifier is to

Accepted Answer

decrease the input resistance and increase the output resistance.

Answer

increase the input resistance and decrease the output resistance.

Answer

increase both input and output resistances.

Answer

decrease both input and output resistances.