Operational Amplifier MCQ

Attempt Free Operational Amplifier MCQ Here. Read The Important Electricity MCQ From Below.

Q1. A differential amplifier ……………..

is a part of an Op-amp
has one input and one output
has two outputs
answers (1) and (2)

Answer : 4

Q 2. When a differential amplifier is operated single-ended, …………

the output is grounded
one input is grounded and signal is applied to the other
both inputs are connected together
the output is not inverted

Answer : 2

Q3. In differential-mode, …………….

opposite polarity signals are applied to the inputs
the gain is one
the outputs are of different amplitudes
only one supply voltage is used

Answer : 1

Q4. In the common mode, ……………

both inputs are grounded
the outputs are connected together
an identical signal appears on both the inputs
the output signal are in-phase

Answer : 3

Operational Amplifier MCQ

Q5. The common-mode gain is ………..

very high
very low
always unity
unpredictable

Answer : 2

Q6. The differential gain is ………

very high
very low
dependent on input voltage
about 100

Answer : 1

Q7. If ADM = 3500 and ACM = 0.35, the CMRR is ……….

1225
10,000
80 dB
answers (1) and (3)

Answer : 4

Q8. With zero volts on both inputs, an OP-amp ideally should have an output ………..

equal to the positive supply voltage
equal to the negative supply voltage
equal to zero
equal to CMRR

Answer : 3

Q9. Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is ……

1
2000
80 dB
100,000

Answer : 4

Operational Amplifier MCQ

Q10. A certain OP-amp has bias currents of 50 μA. The input offset current is ……..

700 nA
99.3 μA
49.7 μA
none of these

Answer : 1

Q11. The output of a particular Op-amp increases 8V in 12μs. The slew rate is …….

90 V/μs
0.67 V/μs
1.5 V/μs
none of these

Answer : 2

Q12. For an Op-amp with negative feedback, the output is …….

equal to the input
increased
fed back to the inverting input
fed back to the noninverting input

Answer : 3

Q13. The use of negative feedback ………

reduces the voltage gain of an Op-amp
makes the Op-amp oscillate
makes linear operation possible
answers (1) and (2)

Answer : 4

Q14. Negative feedback ………..

increases the input and output impedances
increases the input impedance and bandwidth
decreases the output impedance and bandwidth
does not affect impedance or bandwidth

Answer : 2

Operational Amplifier MCQ

Q15. A certain noninverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is ………

100,000
1000
101
100

Answer : 3

Q16. If the feedback resistor in Q15 (above question) is open, the voltage gain …….

increases
decreases
is not affected
depends on Ri

Answer : 1

Q17. 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 ……..

doubles
drops to 12.5
remains at 25
increases slightly

Answer : 3

Q18. A voltage follower ……….

has a voltage gain of 1
is noninverting
has no feedback resistor
has all of these

Answer : 4

Operational Amplifier MCQ

Q19. The Op-amp can amplify

a.c. signals only
d.c. signals only
both a.c. and d.c. signals
neither d.c. nor a.c. signals

Answer : 3

Q20. The input offset current equals the ……….

difference between two base currents
average of two base currents
collector current divided by current gain
none of these

Answer : 1

Q21. The tail current of a differential amplifier is …….

half of either collector current
equal to either collector current
two times either collector current
equal to the difference in base currents

Answer : 3

Q22. The node voltage at the top of the til resistor is closes to ……….

collector supply voltage
zero
emitter supply voltage
tail current times base resistance

Answer : 2

Q23. The tail current in a differential amplifier equals …….

difference between two emitter currents
sum of two emitter currents
collector current divided by current gain
collector voltage divided by collector resistance

Answer : 2

Q24. The differential voltage gain of a differential amplifier is equal to RC divided by …….

r’e
r’e/2
2r’e
RE

Answer : 3

Operational Amplifier MCQ

Q25. The input impedance of a differential amplifier equals r’e times ……

β
RE
RC
2β

Answer : 4

Q26. A common-mode signal is applied to ……….

the noninverting input
the inverting input
both inputs
top of the tail resistor

Answer : 3

Q27. The common-mode voltage gain is ………