Electrical Engineering Mcqs Practice Test

Question 1

Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________?

Accepted Answer

D.	100,000

Question 2

If ADM = 3500 and ACM = 0.35, the CMRR is _______________?

Accepted Answer

D.	answers (A) and (B)

Question 3

The common-mode gain is ________________?

Accepted Answer

B.	very low

Question 4

In differential-mode, ______________?

Accepted Answer

A.	opposite polarity signals are applied to the inputs

Question 5

The differential gain is _____________?

Accepted Answer

A.	very high

Question 6

When a differential amplifier is operated single-ended, _______________?

Accepted Answer

B.	one input is grounded and signal is applied to the other

Question 7

With zero volts on both inputs, an OP-amp ideally should have an output _______________?

Accepted Answer

C.	equal to zero

Question 8

In the common mode, _______________?

Accepted Answer

C.	an identical signal appears on both the inputs

Question 9

A differential amplifier______________?

Accepted Answer

D.	answers (A) and (B)

Question 10

The tail current of a differential amplifier is_______________?

Accepted Answer

C.	two times either collector current

Question 11

A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain________________?

Accepted Answer

C.	remains at 25

Question 12

The use of negative feedback ________________?

Accepted Answer

D.	answers (A) and (B)

Question 13

A certain OP-amp has bias currents of 50 µA. The input offset current is_________________?

Accepted Answer

A.	700 nA

Question 14

If the feedback resistor in Q15 (above question) is open, the voltage gain ____________?

Accepted Answer

A.	increases

Question 15

A voltage follower _____________?

Accepted Answer

D.	has all of these

Question 16

The input offset current equals the_____________?

Accepted Answer

A.	difference between two base currents

Question 17

The tail current in a differential amplifier equals ______________?

Accepted Answer

B.	sum of two emitter currents

Question 18

A common-mode signal is applied to ________________?

Accepted Answer

C.	both iputs

Question 19

The input stage of an Op-amp is usually a ________________?

Accepted Answer

A.	differential amplifier

Question 20

Current cannot flow to ground through _______________?

Accepted Answer

C.	a virtual ground