Operational Amplifiers MCQs

Question 1

How many leads does the TO-5 metal can package of an operational amplifier have?

Accepted Answer

8, 10, or 12

Answer

6, 8, or 10

Answer

8 or 14

Answer

8 or 16

Question 2

If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?

Accepted Answer

1.42 mV

Answer

3.5 mV

Answer

ground

Answer

0.56 mV

Question 3

Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:

Accepted Answer

Ri

Answer

Rf + Ri

Answer

∞

Answer

Rf – Ri

Question 4

The closed-loop voltage gain of an inverting amplifier equals:

Accepted Answer

the feedback resistance divided by the input resistance

Answer

the ratio of the input resistance to the feedback resistance

Answer

the open-loop voltage gain

Answer

the input resistance

Question 5

All of the following are basic op-amp input modes of operation EXCEPT

Accepted Answer

inverting mode

Answer

common-mode

Answer

double-ended

Answer

single-ended

Question 6

With negative feedback, the returning signal

Accepted Answer

opposes the input signal

Answer

is proportional to the output current

Answer

is proportional to the differential voltage gain

Answer

aids the input signal

Question 7

The voltage follower has a:

Accepted Answer

closed-loop voltage gain of unity

Answer

small open-loop voltage gain

Answer

closed-loop bandwidth of zero

Answer

large closed-loop output impedance

Question 8

The ratio between differential gain and common-mode gain is called:

Accepted Answer

common-mode rejection

Answer

amplitude

Answer

differential-mode rejection

Answer

phase

Question 9

If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

Accepted Answer

6240 ohms

Answer

2.4 kilohms

Answer

410 ohms

Answer

0.62 kilohms