Inverting and Non-Inverting Amplifiers — MCQs – EE

1. In an inverting amplifier, the input signal is applied to the:
(A) Non-inverting terminal
(B) Inverting terminal
(C) Both terminals
(D) Ground

2. In a non-inverting amplifier, the input signal is applied to the:
(A) Inverting terminal
(B) Non-inverting terminal
(C) Output terminal
(D) Ground

3. In an inverting amplifier, the output signal is:
(A) In phase with the input
(B) 90° out of phase
(C) 180° out of phase
(D) Randomly phased

4. In a non-inverting amplifier, the output signal is:
(A) In phase with the input
(B) Out of phase by 180°
(C) Out of phase by 90°
(D) Random

5. The voltage gain of an inverting amplifier is:
(A) Positive
(B) Negative
(C) Zero
(D) Unity

6. The voltage gain of a non-inverting amplifier is:
(A) Always less than 1
(B) Always equal to 1
(C) Always greater than or equal to 1
(D) Always negative

7. In an inverting amplifier, the phase difference between input and output is:
(A) 0°
(B) 90°
(C) 180°
(D) 360°

8. In a non-inverting amplifier, the phase difference between input and output is:
(A) 0°
(B) 90°
(C) 180°
(D) 270°

9. In an inverting amplifier, the input impedance is approximately equal to:
(A) Input resistor
(B) Feedback resistor
(C) Output resistor
(D) Open circuit

10. In a non-inverting amplifier, the input impedance is approximately:
(A) Low
(B) High
(C) Equal to feedback resistor
(D) Equal to input resistor

11. In an inverting amplifier, the gain depends on:
(A) Only input resistor
(B) Only feedback resistor
(C) Ratio of feedback to input resistors
(D) Power supply voltage

12. In a non-inverting amplifier, the gain depends on:
(A) Only feedback resistor
(B) Only input resistor
(C) Ratio of feedback and input resistors
(D) Supply voltage

13. The voltage gain magnitude of an inverting amplifier increases when:
(A) Input resistor increases
(B) Feedback resistor increases
(C) Feedback resistor decreases
(D) Input resistor decreases

14. The voltage gain of a non-inverting amplifier can never be:
(A) Less than 1
(B) Greater than 1
(C) Equal to 1
(D) Positive

15. In an inverting amplifier, the input signal appears to be connected through a:
(A) Low impedance
(B) High impedance
(C) Virtual ground
(D) Real ground

16. The concept of virtual ground is applicable to:
(A) Inverting amplifier
(B) Non-inverting amplifier
(C) Differential amplifier
(D) Comparator

17. The closed-loop gain of an inverting amplifier is controlled by:
(A) Input and feedback resistors
(B) Power supply
(C) Op-Amp internal gain
(D) Input bias current

18. The voltage gain of a non-inverting amplifier increases with:
(A) Increase in feedback resistor
(B) Increase in input resistor
(C) Decrease in feedback resistor
(D) Decrease in supply voltage

19. In an inverting amplifier, the current flowing into the Op-Amp input terminal is:
(A) High
(B) Zero
(C) Infinite
(D) Depends on bias voltage

20. The gain of a unity-gain amplifier is:
(A) 0
(B) 1
(C) 10
(D) Infinite

21. A voltage follower is a special case of:
(A) Inverting amplifier
(B) Non-inverting amplifier
(C) Differential amplifier
(D) Integrator

22. The input impedance of a voltage follower is:
(A) Low
(B) Moderate
(C) Very high
(D) Zero

23. The output impedance of a voltage follower is:
(A) High
(B) Low
(C) Infinite
(D) Moderate

24. In an inverting amplifier, the output voltage increases when:
(A) Input voltage increases positively
(B) Input voltage increases negatively
(C) Input voltage decreases
(D) Output is grounded

25. In a non-inverting amplifier, the feedback is applied:
(A) From output to inverting input
(B) From output to non-inverting input
(C) From output to both inputs
(D) No feedback used

26. The purpose of negative feedback in both amplifier types is to:
(A) Decrease stability
(B) Reduce gain and increase bandwidth
(C) Increase distortion
(D) Reduce input impedance

27. The output of an inverting amplifier is proportional to:
(A) Input voltage
(B) Negative of input voltage
(C) Square of input voltage
(D) Constant value

28. The output of a non-inverting amplifier is proportional to:
(A) Input voltage
(B) Negative of input voltage
(C) Square of input voltage
(D) Inverse of input voltage

29. The signal phase in an inverting amplifier is:
(A) Same as input
(B) Reversed
(C) Random
(D) Delayed

30. The non-inverting amplifier is generally preferred when:
(A) High input impedance and phase preservation are required
(B) Phase inversion is required
(C) Low impedance load is used
(D) Power gain is needed