Fundamentals Of Digital Electronics: Quiz!

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Fundamentals Of Digital Electronics: Quiz! - Quiz

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Questions and Answers
  • 1. 

    Using Ohm's Law, power is the product of what two things?

    • A.

      Wattage And Impedance

    • B.

      Current And Voltage

    • C.

      Voltage And Reactance

    • D.

      Resistance And Current

    Correct Answer
    B. Current And Voltage
    Explanation
    Ohm's Law states that the power in an electrical circuit is equal to the product of the current and voltage. Therefore, the correct answer is Current And Voltage.

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  • 2. 

    Who was the German scientist that discovered the mathematical relationship between current, voltage, and resistance?

    • A.

      Count Frankenstein

    • B.

      Robert Braun

    • C.

      Georg Simon Ohm

    • D.

      Albert Einstein

    Correct Answer
    C. Georg Simon Ohm
    Explanation
    Georg Simon Ohm was the German scientist who discovered the mathematical relationship between current, voltage, and resistance. Ohm's Law, named after him, states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor. His groundbreaking work in the field of electricity laid the foundation for the development of electrical circuits and is still widely used in electrical engineering and physics today.

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  • 3. 

    In electronic theory, what does the term rectification mean?

    • A.

      Restoration Of A Charge To Overcome Delay Effects

    • B.

      The Bending Of Radio Waves As They Pass From One Medium To The Next

    • C.

      The Process Of Converting Ac To Dc

    • D.

      The Process Of Converting Dc To Ac

    Correct Answer
    C. The Process Of Converting Ac To Dc
    Explanation
    Rectification refers to the process of converting alternating current (AC) to direct current (DC). AC is an electrical current that periodically reverses direction, while DC flows in one direction only. Rectification is achieved by using a device called a rectifier, which allows the flow of current in only one direction, effectively converting AC to DC. This is commonly used in various electronic devices and power supplies where a steady and unidirectional current is required.

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  • 4. 

    What is the internationally accepted unit of frequency?

    • A.

      Period

    • B.

      Cycle

    • C.

      Hertz

    • D.

      Repetition

    Correct Answer
    C. Hertz
    Explanation
    Hertz is the internationally accepted unit of frequency. It measures the number of cycles or oscillations of a wave per second. It is named after Heinrich Hertz, a German physicist who made significant contributions to the study of electromagnetic waves. The term "hertz" is widely used in various fields such as physics, engineering, and telecommunications to quantify the frequency of signals and waves.

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  • 5. 

    The operation of a transistor is an example of what basic function of all semiconductor devices?

    • A.

      Regulating The Flow Of Electrons

    • B.

      Removing Electrons

    • C.

      Powering Radios

    • D.

      Increasing The Circuit's Voltage

    Correct Answer
    A. Regulating The Flow Of Electrons
    Explanation
    The operation of a transistor involves regulating the flow of electrons. Transistors are semiconductor devices that can amplify or switch electronic signals and are commonly used in electronic devices such as radios, computers, and televisions. By controlling the flow of electrons through the transistor, it can regulate the current and voltage in a circuit, allowing for precise control and manipulation of electronic signals.

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  • 6. 

    What is the main difference between a PNP transistor and an NPN transistor?

    • A.

      A PNP Works Better Than A NPN

    • B.

      How Current Relates To The Base

    • C.

      NPN Regulates Current, PNP Voltage

    • D.

      There Is No Difference

    Correct Answer
    B. How Current Relates To The Base
    Explanation
    The main difference between a PNP transistor and an NPN transistor is how current relates to the base. In an NPN transistor, the current flows into the base, while in a PNP transistor, the current flows out of the base. This difference in current direction is due to the difference in the doping of the transistor's layers. In an NPN transistor, the base is P-doped and the emitter and collector are N-doped, while in a PNP transistor, the base is N-doped and the emitter and collector are P-doped.

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  • 7. 

    What is negative feedback?

    • A.

      When The Current Is Increased, The Voltage Goes More Negative

    • B.

      When A Portion Of The Output Signal Is Returned, Out Of Phase, To The Input Stage

    • C.

      What An Amplifier Gets When It Performs Poorly On The Test Bench

    • D.

      A Base Bias Voltage That Makes The Gate Of The Transistor Go More Negative

    Correct Answer
    B. When A Portion Of The Output Signal Is Returned, Out Of Phase, To The Input Stage
    Explanation
    Negative feedback refers to the process of returning a portion of the output signal, but in an out of phase manner, back to the input stage of an amplifier. This is done to stabilize and improve the performance of the amplifier. By introducing this feedback, any variations or distortions in the output signal can be corrected, resulting in a more accurate and faithful reproduction of the input signal. The out of phase nature of the feedback helps to counteract any positive feedback or amplification of errors, thereby reducing distortion and maintaining stability.

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  • 8. 

    In which appliance would you store your milk, eggs and cheese?

    • A.

      Refrigerator

    • B.

      Blender

    • C.

      Toaster

    • D.

      Oven

    Correct Answer
    A. Refrigerator
    Explanation
    The correct answer is refrigerator because it is an appliance specifically designed to store perishable items like milk, eggs, and cheese at a cool temperature to prevent them from spoiling. A blender is used for mixing ingredients, a toaster is used for toasting bread, and an oven is used for baking or cooking food. None of these appliances are designed for storing perishable items like milk, eggs, and cheese.

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  • 9. 

    What type of machine is an Apple iPod?

    • A.

      A Cellphone

    • B.

      An MP3 Player

    • C.

      A BlackBerry

    • D.

      A GPS Device

    Correct Answer
    B. An MP3 Player
    Explanation
    The Apple iPod is an MP3 player. It is a portable device that allows users to store and play digital audio files. The iPod was first introduced by Apple in 2001 and has since become one of the most popular and iconic MP3 players in the world. It revolutionized the way people listen to music, offering a sleek design, user-friendly interface, and a large storage capacity for music files. The iPod also paved the way for the development of other portable media players and influenced the way we consume music in the digital age.

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  • 10. 

    How many digits are in a U.S. telephone area code?

    • A.

      Three

    • B.

      Six

    • C.

      Ten

    • D.

      Seven

    Correct Answer
    A. Three
    Explanation
    U.S. telephone area codes consist of three digits. Each area code represents a specific geographic region in the United States. This allows for efficient routing of calls within the country.

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  • 11. 

    A small value capacitor in series with a tweeter forms what kind of filter?

    • A.

      3 Db Per Octave Low Pass

    • B.

      6 Db Per Octave Low Pass

    • C.

      12 Db Per Octave High Pass

    • D.

      6 Db Per Octave High Pass

    Correct Answer
    D. 6 Db Per Octave High Pass
    Explanation
    A small value capacitor in series with a tweeter forms a 6 Db Per Octave High Pass filter. This means that the filter allows high-frequency signals to pass through while attenuating low-frequency signals. The small value capacitor acts as a high-pass filter, blocking low-frequency signals and allowing high-frequency signals to pass through. The 6 Db per octave refers to the rate at which the filter attenuates the low-frequency signals as the frequency decreases.

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  • 12. 

    The ultra-linear concept was introduced in 1951 by what famous engineer?

    • A.

      Bob Carver

    • B.

      W.I. Heath

    • C.

      David Hafler

    • D.

      D.T.N. Williamson

    Correct Answer
    C. David Hafler
    Explanation
    David Hafler is the correct answer because he is the famous engineer who introduced the ultra-linear concept in 1951. The ultra-linear concept refers to a technique used in audio amplifier design that combines the advantages of both triode and pentode vacuum tubes. Hafler's innovation helped improve the performance and efficiency of audio amplifiers, making it a significant contribution to the field of audio engineering.

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  • 13. 

    What are the main components of an electromechanical relay?

    • A.

      Two Diodes, Spring, Magnet

    • B.

      Contacts, Coil, Spring

    • C.

      Op Amp, Coil, Spring

    • D.

      Contacts, Diode, Coil

    Correct Answer
    B. Contacts, Coil, Spring
    Explanation
    The main components of an electromechanical relay are contacts, coil, and spring. Contacts are used to make or break the electrical circuit when the relay is activated. The coil is energized to create a magnetic field, which in turn moves the contacts. The spring provides the necessary mechanical force to return the contacts to their original position when the coil is de-energized.

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  • 14. 

    Radiated noise that is transmitted through a magnetic field to signal lines is known as what?

    • A.

      Inductive Coupling

    • B.

      Harmonic Distortion

    • C.

      Capacitive Coupling

    • D.

      Hysteresis Distortion

    Correct Answer
    A. Inductive Coupling
    Explanation
    Inductive coupling refers to the transmission of radiated noise through a magnetic field to signal lines. This occurs when the changing magnetic field generated by one circuit induces a voltage in an adjacent circuit. This coupling can result in unwanted noise or interference in the signal lines, affecting the performance of electronic devices. Capacitive coupling, on the other hand, refers to the transmission of noise through an electric field, while harmonic distortion and hysteresis distortion are unrelated to the transmission of radiated noise through a magnetic field.

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