1 $How many pins are present in a standard 741 Operational Amplifier DIP (Dual In-line Package)?$

A.

6

B.

8

C.

14

D.

16

2 $In a 741 Op-amp, which pin is designated as the inverting input?$

A.

Pin 2

B.

Pin 3

C.

Pin 6

D.

Pin 7

3 $Which pins are used for the 'offset null' adjustment in a 741 Op-amp?$

A.

Pins 2 and 3

B.

Pins 4 and 7

C.

Pins 1 and 5

D.

Pins 6 and 8

4 $What is the primary function of the input stage in an operational amplifier's internal block diagram?$

A.

To shift the DC level to zero

B.

To provide high voltage gain and high input impedance

C.

To provide a low output impedance

D.

To amplify the common-mode signal

5 $Why is a level shifting stage required in the internal block diagram of an Op-amp?$

A.

To increase the AC voltage gain

B.

To shift the DC level to zero volts at the output

C.

To convert a differential signal to a single-ended signal

D.

To provide short-circuit protection

6 $What is the voltage gain () of an ideal inverting amplifier?$

A.

B.

C.

D.

7 $What is the closed-loop voltage gain of a non-inverting amplifier?$

A.

B.

C.

D.

8 $What is the phase difference between the input and output signals in an inverting amplifier?$

A.

B.

C.

D.

9 $Which of the following describes the 'Virtual Ground' concept in an Op-amp?$

A.

The output terminal is directly connected to ground.

B.

Both input terminals are connected to a physical ground.

C.

The voltage at the inverting terminal tracks the non-inverting terminal without a physical connection.

D.

The power supply pins are grounded.

10 $What is the ideal input impedance () of an operational amplifier?$

A.

Zero

B.

C.

D.

Infinity

11 $What is the ideal output impedance () of an operational amplifier?$

A.

Zero

B.

C.

D.

Infinity

12 $Which parameter describes the ability of an Op-amp to reject noise common to both input terminals?$

A.

Slew Rate

B.

Common Mode Rejection Ratio (CMRR)

C.

Power Supply Rejection Ratio (PSRR)

D.

Input Offset Voltage

13 $What is the ideal bandwidth of an operational amplifier?$

A.

Zero

B.

C.

D.

Infinity

14 $The output of a basic differential amplifier is proportional to:$

A.

The sum of the two input voltages

B.

The product of the two input voltages

C.

The difference between the two input voltages

D.

The ratio of the two input voltages

15 $How many op-amps are typically used to construct a standard instrumentation amplifier?$

A.

1

B.

2

C.

3

D.

4

16 $Which of the following is a key advantage of an instrumentation amplifier over a basic differential amplifier?$

A.

It operates without a power supply

B.

It has a very low input impedance

C.

Its gain can be easily adjusted using a single external resistor

D.

It can only amplify AC signals

17 $In an ideal Op-amp integrator circuit, what is the feedback component?$

A.

Resistor

B.

Capacitor

C.

Inductor

D.

Diode

18 $What type of waveform is produced at the output of an integrator if the input is a constant DC voltage?$

A.

Sine wave

B.

Square wave

C.

Ramp voltage

D.

Impulse

19 $In an Op-amp differentiator circuit, where is the capacitor located?$

A.

In the feedback loop

B.

In series with the inverting input

C.

In series with the output

D.

Between the non-inverting input and ground

20 $If a triangular wave is applied to the input of an ideal differentiator, what is the resulting output waveform?$

A.

Sine wave

B.

Square wave

C.

Sawtooth wave

D.

Parabolic wave

21 $What is the primary function of a summing amplifier?$

A.

To multiply two input signals

B.

To add two or more input signals

C.

To differentiate an input signal

D.

To act as a voltage buffer

22 $How can a summing amplifier be converted into an averaging amplifier for inputs?$

A.

By setting all input resistors equal and the feedback resistor to

B.

By replacing the feedback resistor with a capacitor

C.

By using a non-inverting configuration only

D.

By grounding all inputs

23 $A difference amplifier performs the mathematical operation of:$

A.

Integration

B.

Addition

C.

Subtraction

D.

Multiplication

24 $What is the voltage gain of a unity gain voltage buffer (voltage follower)?$

A.

0

B.

0.5

C.

1

D.

Infinity

25 $What is the primary application of a voltage buffer circuit?$

A.

High voltage amplification

B.

Impedance matching or isolation

C.

Signal integration

D.

High frequency filtering

26 $Which of the following is true for an active filter compared to a passive filter?$

A.

It uses bulky inductors.

B.

It attenuates the passband signals.

C.

It can provide voltage gain.

D.

It works without a power supply.

27 $What is the roll-off rate of a first-order active low-pass filter?$

A.

B.

C.

D.

28 $What is the formula for the cutoff frequency () of a simple RC active low-pass filter?$

A.

B.

C.

D.

29 $Which frequencies are allowed to pass through a high-pass filter?$

A.

Frequencies below the cutoff frequency

B.

Frequencies above the cutoff frequency

C.

Only a specific narrow band of frequencies

D.

All frequencies

30 $In which configuration does a basic Op-amp comparator operate?$

A.

Closed-loop with negative feedback

B.

Closed-loop with positive feedback

C.

Open-loop configuration

D.

Voltage follower configuration

31 $What are the possible output states of an ideal Op-amp comparator?$

A.

Any voltage between 0 and

B.

An amplified version of the input sine wave

C.

and

D.

Only 0 Volts

32 $In a Zero Crossing Detector (ZCD), what is the reference voltage?$

A.

B.

C.

(Ground)

D.

33 $If a sine wave is applied to a Zero Crossing Detector, what is the output waveform?$

A.

A phase-shifted sine wave

B.

A square wave

C.

A triangular wave

D.

A sawtooth wave

34 $How is the Slew Rate of an Op-amp defined?$

A.

The maximum rate of change of the output voltage with respect to time

B.

The maximum voltage gain achievable

C.

The speed at which the input voltage can change

D.

The ratio of output voltage to input current

35 $What is the standard unit for expressing Slew Rate in op-amp datasheets?$

A.

B.

C.

D.

36 $What type of distortion occurs if an Op-amp is driven by a high-frequency sine wave that exceeds its Slew Rate?$

A.

Phase distortion

B.

Harmonic distortion

C.

Slew-rate induced distortion (output becomes triangular)

D.

Crossover distortion

37 $What is the definition of Input Offset Voltage as found in an Op-amp datasheet?$

A.

The voltage at the output when inputs are grounded.

B.

The differential voltage that must be applied to the inputs to force the output to zero.

C.

The maximum voltage that can be applied to the input terminals.

D.

The voltage drop across the input resistors.

38 $What does PSRR stand for in an Op-amp datasheet?$

A.

Power Signal Rejection Ratio

B.

Phase Shift Rejection Ratio

C.

Power Supply Rejection Ratio

D.

Positive Signal Return Ratio

39 $What is 'Input Bias Current'?$

A.

The current drawn by the load.

B.

The current required by the power supply pins.

C.

The average of the DC currents flowing into the inverting and non-inverting input terminals.

D.

The difference between the input currents.

40 $What does the acronym SPICE stand for in the context of PSpice?$

A.

Software Program for Integrated Circuit Engineering

B.

Simulation Program with Integrated Circuit Emphasis

C.

System Parameter Internal Circuit Evaluator

D.

Standard Program for Interactive Circuit Engineering

41 $Which PSpice analysis type is used to obtain the frequency response (Bode plot) of an Op-amp filter?$

A.

DC Sweep

B.

Transient Analysis

C.

AC Sweep

D.

Bias Point

42 $In PSpice, what is Transient Analysis used for?$

A.

To find the operating DC bias point

B.

To observe circuit behavior over a specified time period

C.

To sweep the temperature of the circuit

D.

To analyze the frequency spectrum

43 $Which is a major recent trend in the design of Op-amps for wearable robotics?$

A.

Requirement of extremely high supply voltages

B.

Use of exclusively through-hole technology

C.

Development of ultra-low power and low voltage Op-amps

D.

Elimination of surface mount devices (SMD)

44 $What does MEMS stand for, an area where miniature Op-amps are heavily integrated?$

A.

Micro-Electromechanical Systems

B.

Macro-Electronic Mechanical Systems

C.

Micro-Electronic Memory Systems

D.

Miniature Electrical Motor Systems

45 $How are modern Op-amps commonly integrated in System-on-Chip (SoC) designs?$

A.

They are kept as separate off-chip components only.

B.

They are entirely replaced by digital logic gates.

C.

They are embedded alongside microcontrollers and digital interfaces on the same silicon die.

D.

They are used exclusively in passive packages.

46 $What role does AI and Machine Learning currently play in the trend of electronics design (EDA)?$

A.

AI physically solders the components.

B.

AI is used to optimize circuit layouts, predict failures, and tune parameters automatically.

C.

AI has replaced the need for basic laws of physics in simulation.

D.

AI generates AC power for the circuits.

47 $In flexible electronics, how are Op-amps typically adapted?$

A.

They are built using rigid ceramic packages only.

B.

They are manufactured using organic semiconductors or ultra-thin silicon on flexible substrates.

C.

They require vacuum tubes.

D.

They cannot be used in flexible electronics.

48 $What determines the bandwidth of an active filter using a 741 Op-amp?$

A.

Only the resistors and capacitors

B.

The Gain-Bandwidth Product (GBWP) of the Op-amp

C.

The power supply voltage exclusively

D.

The input offset current

49 $A Constant Gain Amplifier configuration with a negative gain relies on which type of feedback?$

A.

Positive feedback

B.

Negative feedback

C.

No feedback (Open loop)

D.

Inductive feedback

50 $Why are inductors generally avoided in modern Op-amp based active filters?$

A.

Inductors block DC signals entirely.

B.

Inductors naturally generate negative resistance.

C.

Inductors are bulky, heavy, and difficult to integrate onto ICs.

D.

Op-amps cannot process inductive currents.

Unit 6 - Practice Quiz