Master Electronic Devices and Circuits: Quizzes and Practice Questions

Question 1

Which circuit type in electrical engineering is specifically designed to increase the amplitude of an input voltage signal?

Accepted Answer

Common-emitter amplifier circuit

Answer

Passive filter circuit

Answer

Constant-current source circuit

Answer

Schmitt trigger circuit

Question 2

Regarding diode characteristics, which statement is accurate?

Accepted Answer

Diodes have a distinct turn-on voltage.

Answer

Diodes have a linear voltage-current relationship.

Answer

Diodes have high resistance when conducting in the forward direction.

Answer

Diodes can amplify signals.

Question 3

In operational amplifier circuits, the gain-bandwidth product is:

Accepted Answer

Inversely proportional to the circuit's closed-loop bandwidth.

Answer

Independent of the feedback components.

Answer

Proportional to the circuit's closed-loop gain.

Answer

Affected only by the circuit's input impedance.

Question 4

In a BJT amplifier circuit, what is the main function of the emitter resistor (Re)?

Accepted Answer

Control the transistor's DC bias point

Answer

Provide a path for base current flow

Answer

Limit the transistor's output current

Answer

Provide negative feedback to the amplifier

Question 5

Which circuit type is not an amplifier?

Accepted Answer

Class-D

Answer

Common-emitter

Answer

Common-collector

Answer

Operational amplifier

Question 6

Which characteristic does NOT apply to an ideal operational amplifier?

Accepted Answer

Limited bandwidth

Answer

Infinite input impedance

Answer

Zero output impedance

Answer

High open-loop gain

Question 7

Identify the circuit that is NOT an amplifier circuit:

Accepted Answer

Wein bridge oscillator

Answer

Common-emitter amplifier

Answer

Common-source amplifier

Answer

Operational amplifier

Question 8

Which electronic component is designed to permit current flow in a single direction within a DC circuit?

Accepted Answer

Diode

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 9

In an operational amplifier (op-amp) circuit, which configuration produces an output signal that is inverted, with the input signal multiplied by a negative gain?

Accepted Answer

Inverting amplifier

Answer

Non-inverting amplifier

Answer

Differential amplifier

Answer

Summing amplifier

Question 10

What is the primary function of operational amplifiers (op-amps) in electronic circuits?

Accepted Answer

Amplifying weak signals

Answer

Converting analog signals to digital signals

Answer

Filtering out unwanted frequencies

Answer

Generating oscillations for timing circuits

Question 11

What is a potential drawback of using operational amplifiers in electronic circuits?

Accepted Answer

Sensitivity to noise

Answer

High input impedance

Answer

Low output impedance

Answer

Adjustable voltage gain

Question 12

Which of the following is a characteristic that is undesirable in an amplifier circuit?

Accepted Answer

High power consumption

Answer

High gain

Answer

Low distortion

Answer

High bandwidth

Question 13

Which feedback amplifier configuration is not a valid option?

Accepted Answer

Cascaded feedback

Answer

Positive feedback

Answer

Negative feedback

Answer

Regenerative feedback

Question 14

Which of these is a key feature of an operational amplifier?

Accepted Answer

High input impedance and low output impedance

Answer

Low input impedance and high output impedance

Answer

High input impedance and high output impedance

Answer

Low input impedance and low output impedance

Question 15

In an amplifier circuit employing negative feedback, what is the primary purpose of the feedback signal?

Accepted Answer

Reduce the amplifier's sensitivity to component variations and temperature changes.

Answer

Increase the amplifier's gain and bandwidth.

Answer

Eliminate the requirement for biasing circuits in the amplifier.

Question 16

Which of the following is not a type of amplifier circuit?

Accepted Answer

Wien bridge oscillator

Answer

Common-emitter amplifier

Answer

Common-base amplifier

Answer

Common-collector amplifier

Question 17

According to the Unit Description, which electronic device is **not** covered in this unit?

Accepted Answer

Microcontrollers

Answer

Diodes

Answer

Operational Amplifiers

Answer

Transistors

Question 18

Which of these materials is NOT commonly used as a semiconductor in electronic devices?

Accepted Answer

Copper

Answer

Silicon

Answer

Germanium

Question 19

Under reverse bias in a p-n junction diode, which region undergoes an increase in depletion layer width and a significant decrease in current flow?

Accepted Answer

Reverse bias region

Answer

Forward bias region

Answer

Breakdown region

Answer

Ohmic region

Question 20

In power supply circuits, which topology is commonly used for voltage regulation and employs a feedback loop to maintain the output voltage?

Accepted Answer

Series pass transistor regulator

Answer

Zener diode shunt regulator

Answer

Buck-boost converter

Answer

Capacitive-input filter

Question 21

An amplifier circuit has a voltage gain of 100 and an input resistance of 1kΩ. If the input signal is a sine wave with an amplitude of 1 Volt, what is the peak output voltage?

Accepted Answer

100 Volts

Answer

0.01 Volt

Answer

1000 Volts

Question 22

In a transistor amplifier, which biasing configuration allows the transistor to operate in the active region, maximizing both voltage and current gain?

Accepted Answer

Common-emitter

Answer

Common-base

Answer

Common-collector

Answer

Cutoff

Question 23

In the context of operational amplifiers, what is open-loop gain?

Accepted Answer

Gain without feedback

Answer

Gain with negative feedback

Answer

Gain with positive feedback

Answer

Gain with input connected to output

Question 24

To mitigate the impact of temperature fluctuations on amplifier circuits, which compensation techniques can be implemented?

Accepted Answer

Employ transistors with minimal temperature sensitivity

Accepted Answer

Incorporate negative feedback into the circuit design

Answer

Increase the amplifier's supply voltage

Question 25

In an amplifier circuit, the primary function of a coupling capacitor is to:

Accepted Answer

Block direct current (DC) signals while allowing alternating current (AC) signals to pass.

Answer

Bypass AC signals while allowing DC signals to pass.

Answer

Both block and bypass AC signals.

Answer

Neither block nor bypass any signals.

Question 26

In the common-emitter configuration of a BJT:

Accepted Answer

Current gain is the highest

Answer

Voltage gain is the highest

Answer

Input impedance is the highest

Answer

Output impedance is the highest

Question 27

Which of the following is an advantage of using operational amplifiers?

Accepted Answer

High voltage amplification capabilities

Answer

Low input impedance

Answer

High output impedance

Answer

Narrow frequency bandwidth

Question 28

A digital logic circuit with a combination of n inputs can have how many different outputs?

Accepted Answer

2^n

Answer

4^n

Answer

8^n

Answer

16^n

Question 29

The process of integrating numerous electronic circuits onto a single semiconductor substrate is called:

Accepted Answer

Integrated circuit technology

Answer

Encapsulation

Answer

Assembly

Answer

Packaging

Question 30

Which of the following is a unique property of a Zener diode?

Accepted Answer

Fixed voltage drop in reverse bias

Answer

Fixed voltage drop in forward bias

Answer

Ability to handle large currents

Answer

Very low resistance

Question 31

Operational amplifiers can be used as comparators for applications such as:

Accepted Answer

Converting analog signals to digital signals

Answer

Amplifying signals

Answer

Regulating voltage

Answer

Filtering signals

Question 32

The Karnaugh map is a technique used primarily for:

Accepted Answer

Simplifying digital logic expressions

Answer

Designing combinational circuits

Answer

Implementing sequential circuits

Answer

Analyzing circuit fault tolerance

Question 33

What is the gain of an ideal operational amplifier?

Accepted Answer

Infinity

Answer

0

Answer

1

Answer

100

Question 34

Which logic gate is the dual of the OR gate?

Accepted Answer

NOR gate

Answer

AND gate

Answer

NAND gate

Answer

XOR gate

Question 35

What is the purpose of a demultiplexer?

Accepted Answer

To select one of multiple inputs

Answer

To combine multiple inputs into one output

Answer

To convert digital signals to analog signals

Answer

To amplify signals

Question 36

What is the main advantage of using field-effect transistors (FETs) over bipolar junction transistors (BJTs)?

Accepted Answer

Higher input impedance

Answer

Higher gain

Answer

Faster switching speeds

Answer

Lower power consumption

Question 37

What is the unit of measurement for electrical power?

Accepted Answer

Watt

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 38

How does temperature variation impact the operation of electronic circuits?

Accepted Answer

It alters component properties, potentially affecting circuit behavior.

Answer

It has no influence on circuit performance.

Answer

It improves circuit efficiency and stability.

Answer

It causes circuits to fail completely.

Question 39

Which design feature of a Yagi-Uda antenna contributes to its higher gain compared to a dipole antenna?

Accepted Answer

Multiple, precisely positioned parasitic elements acting as directors and reflectors

Answer

Larger conductor diameter to minimize signal losses

Answer

Shorter element length to increase resonant frequency

Question 40

Which of the following is NOT a semiconductor device?

Accepted Answer

Resistor

Answer

Diode

Answer

Transistor

Question 41

What is the primary function of transistors in electronic circuits?

Accepted Answer

Amplifying electrical signals

Answer

Generating electrical power

Answer

Storing electrical charge

Question 42

Which type of amplifier configuration provides a voltage gain greater than 1?

Accepted Answer

Common-emitter amplifier

Answer

Emitter follower

Answer

Common-base amplifier

Question 43

What is the main purpose of employing negative feedback in operational amplifier circuits?

Accepted Answer

Stabilize the output voltage

Answer

Increase amplifier gain

Answer

Decrease amplifier gain

Question 44

Which logic gate implements the OR operation in digital circuits?

Accepted Answer

OR gate

Answer

AND gate

Question 45

Which of the mentioned characteristics is NOT attributed to an ideal operational amplifier?

Accepted Answer

Infinite bandwidth

Answer

Infinite input impedance

Answer

Zero output impedance

Answer

High voltage gain

Question 46

What is the primary role of a bypass capacitor in an electronic circuit?

Accepted Answer

Pass high-frequency signals

Answer

Block high-frequency signals

Answer

Store electrical energy

Question 47

Construct a digital logic circuit using only NAND gates that implements the Boolean expression: F = (A + B) . (C + D)

Accepted Answer

Circuit with three NAND gates

Answer

Circuit with two NAND gates and one inverter

Answer

Circuit with four NAND gates and one OR gate

Answer

Circuit with two NAND gates and two NOR gates

Question 48

Which material is NOT a semiconductor?

Accepted Answer

Aluminum

Answer

Silicon

Answer

Gallium arsenide

Answer

Germanium

Question 49

What is the primary function of a diode?

Accepted Answer

To allow current to flow in only one direction

Answer

To amplify current

Answer

To store charge

Answer

To regulate voltage

Question 50

What is the purpose of using negative feedback in an amplifier circuit?

Accepted Answer

To reduce distortion

Answer

To increase gain

Answer

To reduce gain

Answer

To increase bandwidth

Question 51

Which logic gate is considered the universal logic gate?

Accepted Answer

NAND gate

Answer

AND gate

Answer

OR gate

Answer

NOR gate

Question 52

What is a primary advantage of using an integrated circuit (IC)?

Accepted Answer

Reduced size

Answer

Increased cost

Answer

Lower reliability

Answer

Slower operation

Question 53

What is the fundamental difference between a Class A and Class B amplifier?

Accepted Answer

Class A amplifiers use more power but provide better linearity

Answer

Class B amplifiers use more power but provide better efficiency

Answer

Class A amplifiers have lower distortion but higher output impedance

Answer

Class B amplifiers have higher distortion but lower output impedance

Question 54

What is the primary purpose of a Schmitt trigger?

Accepted Answer

To generate a square wave

Answer

To amplify a signal

Answer

To filter a signal

Answer

To regulate a voltage

Question 55

In amplifier circuits, noise can significantly impair performance. Which technique is commonly used to minimize the impact of noise on circuit performance?

Accepted Answer

Apply negative feedback

Answer

Increase the amplifier's bandwidth

Answer

Add external resistors to the circuit

Answer

Replace the amplifier with a smaller one

Question 56

Which digital modulation technique employs two distinct frequencies to encode digital data?

Accepted Answer

Frequency Shift Keying (FSK)

Answer

Amplitude Shift Keying (ASK)

Answer

Phase Shift Keying (PSK)

Question 57

Explain how Zener diodes regulate voltage and describe their role in electronic circuits.

Accepted Answer

Zener diodes regulate voltage by operating in reverse bias, maintaining a constant voltage across a specific current range.

Answer

Zener diodes regulate voltage by adjusting their forward current, varying the voltage drop across them.

Answer

Zener diodes are simply regular diodes with a higher reverse breakdown voltage.

Question 58

Which type of amplifier configuration provides a high voltage gain but low current gain?

Accepted Answer

Common-collector amplifier

Answer

Common-emitter amplifier

Answer

Common-base amplifier

Answer

Operational amplifier

Question 59

Which logic gate is known as the 'universal gate' due to its ability to implement all other logic functions?

Accepted Answer

NAND gate

Answer

AND gate

Answer

OR gate

Answer

NOT gate

Question 60

What is the fundamental difference between a bipolar junction transistor (BJT) and a field-effect transistor (FET) in terms of their control mechanisms?

Accepted Answer

BJTs are current-controlled while FETs are voltage-controlled

Answer

FETs have higher transconductance than BJTs

Answer

BJTs are more suitable for high-frequency applications

Answer

FETs are more commonly used in digital circuits

Question 61

Which of the following represents the correct electronic symbol for a diode?

Accepted Answer

|>I

Answer

-

Answer

I

Answer

>I

Question 62

What is the primary function of a transistor?

Accepted Answer

To amplify or switch electronic signals.

Answer

To generate electrical power.

Answer

To regulate voltage.

Answer

To store electrical energy.

Question 63

What is the main purpose of an operational amplifier?

Accepted Answer

To perform mathematical operations on analog signals.

Answer

To amplify digital signals.

Answer

To convert analog signals to digital signals.

Question 64

Which logic gate is known as the universal gate?

Accepted Answer

NAND gate

Answer

NOT gate

Answer

OR gate

Answer

AND gate