Interesting Quiz On Amplifiers

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Electronics Quizzes & Trivia

An amplifier, or amp, is an electronic device that can be used to increase the power of a signal. We typically use it in machines to enhance volume, i. E. Speakers. What do you know about them?


Questions and Answers
  • 1. 

    In a push-pull amplifier, what makes an input signal two of equal amplitude and opposite polarity?

    • A.

      Ripple Converter

    • B.

      White Cathode Follower

    • C.

      Phase Splitter

    • D.

      Atom Splitter

    Correct Answer
    C. Phase Splitter
    Explanation
    A phase splitter is used in a push-pull amplifier to generate two signals of equal amplitude but opposite polarity. This is achieved by splitting the input signal into two separate signals that are 180 degrees out of phase with each other. The phase splitter circuit typically uses components such as transformers or transistors to achieve this phase shifting effect. By having two signals with opposite polarities, the push-pull amplifier can effectively amplify the input signal while canceling out any even-order harmonic distortions, resulting in a cleaner and more accurate output signal.

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  • 2. 

    Which of these is not an actual twentieth-century amplifier brand?

    • A.

      Marshall

    • B.

      Real Time

    • C.

      Peavey

    • D.

      Fender

    Correct Answer
    B. Real Time
    Explanation
    Real Time is not an actual twentieth-century amplifier brand. Marshall, Peavey, and Fender are all well-known and established amplifier brands that have been around for many years. However, Real Time is not a recognized brand in the amplifier industry during the twentieth century.

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  • 3. 

    For vacuum tubes used in power amplifiers, the filament power supply is typically how many volts?

    • A.

      115 Volts Ac

    • B.

      6.3 Volts Ac Or Dc

    • C.

      400 Volts Ac

    • D.

      50 Volts Dc

    Correct Answer
    B. 6.3 Volts Ac Or Dc
    Explanation
    The filament power supply for vacuum tubes used in power amplifiers is typically 6.3 volts AC or DC. The filament, also known as the heater, is responsible for heating the cathode of the vacuum tube to emit electrons. This voltage is necessary to ensure proper operation and longevity of the vacuum tube. The option of 6.3 volts AC or DC indicates that the filament power supply can accept either alternating current or direct current as input.

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  • 4. 

    Which one of the following is not a common amplifier distortion?

    • A.

      Slew Rate Limiting

    • B.

      Intermodulation Distortion

    • C.

      Apochromatic Distortion

    • D.

      Total Harmonic Distortion

    Correct Answer
    C. Apochromatic Distortion
    Explanation
    Apochromatic distortion is not a common amplifier distortion. Slew Rate Limiting refers to the maximum rate at which an amplifier can change its output voltage. Intermodulation Distortion occurs when two or more signals mix together and create additional frequencies. Total Harmonic Distortion refers to the distortion caused by harmonics of the input signal. However, Apochromatic Distortion is not a recognized type of distortion in amplifiers.

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  • 5. 

    A vacuum tube predominately amplifies which of the following?

    • A.

      Voltage

    • B.

      Resistance

    • C.

      Current

    • D.

      Vacuum

    Correct Answer
    A. Voltage
    Explanation
    A vacuum tube predominantly amplifies voltage because it is designed to increase the strength of an electrical signal. Voltage represents the potential difference between two points in an electrical circuit, and amplifying it allows for a stronger signal to be transmitted. By contrast, resistance refers to the opposition to the flow of electrical current, and current is the flow of electric charge in a circuit. Vacuum, in this context, is not directly related to the amplification process in a vacuum tube.

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  • 6. 

    What famous amplifier was published in the magazine Wireless World in 1947, and set a standard of performance that was years ahead of its time?

    • A.

      The Marantz Model 9

    • B.

      The Quad

    • C.

      The Williamson

    • D.

      Ampzilla

    Correct Answer
    C. The Williamson
    Explanation
    The Williamson amplifier, published in the magazine Wireless World in 1947, was a famous amplifier that set a standard of performance that was ahead of its time.

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  • 7. 

    A tetrad vacuum tube utilizes how many grids?

    • A.

      1

    • B.

      3

    • C.

      7

    • D.

      2

    Correct Answer
    D. 2
    Explanation
    A tetrad vacuum tube utilizes two grids. Grids are used in vacuum tubes to control the flow of electrons. In a tetrad vacuum tube, there are typically two control grids, one screen grid, and one suppressor grid. The control grids regulate the flow of electrons, while the screen grid helps to increase the efficiency of the tube. The suppressor grid helps to prevent unwanted secondary emission. Therefore, the correct answer is 2.

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  • 8. 

    How many grids does a pentode vacuum tube have?

    • A.

      3

    • B.

      5

    • C.

      2

    • D.

      1

    Correct Answer
    A. 3
    Explanation
    A pentode vacuum tube has three grids. The grids are used to control the flow of electrons within the tube. The first grid, called the control grid, determines the electron flow by applying a varying voltage. The second grid, called the screen grid, helps to accelerate the electrons towards the plate. The third grid, called the suppressor grid, is used to prevent secondary emission of electrons. The presence of these three grids allows the pentode vacuum tube to have better control over the electron flow compared to tubes with fewer grids.

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  • 9. 

    In Great Britain, what is the vacuum tube known as?

    • A.

      Valve

    • B.

      Audion

    • C.

      Glass Transistor

    • D.

      Faucet

    Correct Answer
    A. Valve
    Explanation
    In Great Britain, the vacuum tube is known as a "valve." This term is commonly used to refer to the device that controls the flow of electric current in electronic circuits. The term "valve" is derived from the fact that the device operates by controlling the flow of electrons through a vacuum, similar to how a valve controls the flow of fluids through a pipe. This term is widely used in British English to describe vacuum tubes, while in other regions, such as the United States, the term "vacuum tube" is more commonly used.

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  • 10. 

    A Futterman amplifier is unique due to what fact?

    • A.

      It Does Not Use An Audio Output Transformer

    • B.

      Uses Only One Vacuum Tube

    • C.

      All Of These Choices

    • D.

      Uses Global Positive Feedback

    Correct Answer
    A. It Does Not Use An Audio Output Transformer
    Explanation
    A Futterman amplifier is unique because it does not use an audio output transformer. Unlike other amplifiers that rely on a transformer to transfer power from the output stage to the speakers, a Futterman amplifier uses a different design that eliminates the need for this component. This allows for a more efficient and direct transfer of audio signals, resulting in improved sound quality and performance.

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  • 11. 

    Which statement best describes Class A amplifier operation?

    • A.

      Current Flows During Both The Positive And Negative Half Cycles For A Conduction Angle Of 360 Degrees

    • B.

      Current Only Flows During The Positive Half Cycle Of The Input Waveform

    • C.

      Current Only Flows During The Negative Half Cycle Of The Input Waveform

    • D.

      Current Only Flows During 1/4 Of The Positive Half Cycle Of The Input Waveform

    Correct Answer
    A. Current Flows During Both The Positive And Negative Half Cycles For A Conduction Angle Of 360 Degrees
    Explanation
    Class A amplifier operation is characterized by current flowing during both the positive and negative half cycles of the input waveform, covering a conduction angle of 360 degrees. This means that the amplifier conducts current throughout the entire input waveform, resulting in a high level of linearity and low distortion. This makes Class A amplifiers suitable for applications that require high-quality audio reproduction, although they are less efficient compared to other amplifier classes.

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  • 12. 

    What stage of a vacuum tube amplifier is the most sensitive to hum and noise?

    • A.

      Input Stage

    • B.

      Phase Splitter

    • C.

      Output Stage

    • D.

      Driver Stage

    Correct Answer
    A. Input Stage
    Explanation
    The input stage of a vacuum tube amplifier is the most sensitive to hum and noise. This is because it is the first stage where the audio signal is introduced to the amplifier. Any interference or noise picked up at this stage will be amplified along with the audio signal, resulting in a degraded signal quality. Additionally, the input stage is responsible for amplifying the weakest signals, so any hum or noise present at this stage will be more noticeable compared to other stages.

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  • 13. 

    What does the term "hybrid" mean in the context of power amplifier technology?

    • A.

      A Power Amp That Combines Vacuum Tubes And Solid State Devices In The Input And Output Stages

    • B.

      An Amplifier That Utilizes State Of The Art Technology

    • C.

      A Power Amp That Combines Ics And Discrete Devices

    • D.

      A Mix Of Bipolar, Jfet, And Or Mosfet Transistors

    Correct Answer
    A. A Power Amp That Combines Vacuum Tubes And Solid State Devices In The Input And Output Stages
    Explanation
    The term "hybrid" in the context of power amplifier technology refers to a power amp that combines vacuum tubes and solid-state devices in the input and output stages. This means that the amplifier utilizes both traditional vacuum tube technology and modern solid-state technology to achieve a desired sound output. The combination of these two technologies allows for a unique blend of warm and rich tones from the vacuum tubes, and the reliability and efficiency of solid-state devices.

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  • 14. 

    What is the main difference between MOSFET output devices and bipolar junction transistors?

    • A.

      Bipolar Transistors Are Considerably Larger And More Expensive

    • B.

      Mosfets Are Biased By Voltage Rather Than Current

    • C.

      Mosfets Run Cooler, So Therefore More Efficiently

    • D.

      Bipolar Transistors Have Higher Crossover Distortion

    Correct Answer
    B. Mosfets Are Biased By Voltage Rather Than Current
    Explanation
    MOSFET output devices and bipolar junction transistors differ in terms of how they are biased. While bipolar transistors are biased by current, MOSFETs are biased by voltage. This means that the operation of MOSFETs is controlled by the voltage applied to the gate terminal, whereas the operation of bipolar transistors is controlled by the current flowing through the base terminal. This difference in biasing method affects the overall performance and characteristics of the two types of transistors.

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  • 15. 

    What does the term "bridging" mean in amplifier terminology?

    • A.

      None Of These Choices

    • B.

      Refers To Driving Two Pairs Of Loudspeakers With One Stereo Amplifier

    • C.

      A Way Of Connecting A Stereo Amplifier To Double Output Power

    • D.

      When Two Loudspeakers Are Connected In Series To One Channel Of A Power Amp

    Correct Answer
    C. A Way Of Connecting A Stereo Amplifier To Double Output Power
    Explanation
    The term "bridging" in amplifier terminology refers to a way of connecting a stereo amplifier to double the output power. This is achieved by combining the power from both channels of the amplifier into a single output, effectively increasing the power delivered to the speakers. By bridging the amplifier, it is possible to drive more demanding speakers or achieve higher volume levels.

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  • 16. 

    Why are field effect transistors (FETs) commonly used in the input stage of a power amplifier?

    • A.

      They Offer High Input Impedance And Low Noise

    • B.

      They Make The Circuit More Linear And Lower Distortion

    • C.

      They Offer Better Conversion Efficiency Than Bipolar Junction Transistors

    • D.

      All Of These Choices

    Correct Answer
    A. They Offer High Input Impedance And Low Noise
    Explanation
    Field effect transistors (FETs) are commonly used in the input stage of a power amplifier because they offer high input impedance and low noise. The high input impedance allows for efficient transfer of signals from the input source to the amplifier, minimizing signal loss. Additionally, FETs have a lower noise level compared to other types of transistors, resulting in a cleaner and more accurate amplification of the input signal. Therefore, using FETs in the input stage helps to maintain the fidelity and quality of the amplified output signal.

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  • 17. 

    A power amplifier with a high output impedance will have a low damping factor. What is the definition of damping factor?

    • A.

      The Ratio Between The Input And Output Voltages

    • B.

      The Ratio Of Output Current To Output Voltage

    • C.

      The Amount Of Negative Feedback In Db

    • D.

      The Ability To Control Woofer Cone Motion In A Loudspeaker

    Correct Answer
    D. The Ability To Control Woofer Cone Motion In A Loudspeaker
  • 18. 

    Which of the following is not a true fact about class B amplifiers?

    • A.

      They Are Not Used As Audio Frequency Amplifiers Due To Crossover Distortion

    • B.

      They Have A Higher Efficiency Than Class C Amplifiers

    • C.

      They Have A Higher Efficiency Than Class A Amplifiers

    • D.

      They Have A Conduction Angle Of 180 Degrees

    Correct Answer
    B. They Have A Higher Efficiency Than Class C Amplifiers
    Explanation
    Class B amplifiers do not have a higher efficiency than Class C amplifiers. Class C amplifiers are known for their high efficiency, as they only conduct for a small portion of the input signal cycle. In contrast, Class B amplifiers have a conduction angle of 180 degrees, meaning they conduct for the entire input signal cycle, resulting in lower efficiency compared to Class C amplifiers.

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  • 19. 

    Which of the following is a class A amplifier?

    • A.

      Mesa/Boogie Heartbreaker

    • B.

      Fender Twin

    • C.

      Marshall Jcm 2000

    • D.

      Vox Ac30

    Correct Answer
    D. Vox Ac30
    Explanation
    The Vox AC30 is a class A amplifier because it operates in a single-ended configuration, meaning that the output signal is produced by a single active device (usually a vacuum tube). Class A amplifiers are known for their warm and rich tone, as well as their simplicity in design. They provide a full and smooth sound, making them popular among guitarists. The other options mentioned (Mesa/Boogie Heartbreaker, Fender Twin, and Marshall JCM 2000) are not specifically class A amplifiers, as they can operate in different amplifier classes depending on the specific model and settings.

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  • 20. 

    What guitar and amplifier company makes the "Can" amp?

    • A.

      Ibanez

    • B.

      Epiphone

    • C.

      Peavey

    • D.

      Fender

    Correct Answer
    D. Fender
    Explanation
    Fender is the correct answer because Fender is a well-known guitar and amplifier company that has been in the industry for many years. They are known for producing high-quality instruments and amplifiers that are used by professional musicians worldwide. The "Can" amp is likely one of their products, indicating that Fender is the company that makes it.

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  • 21. 

    In a spread spectrum communication system, what is an approximation of processing gain?

    • A.

      Spread Spectrum Cannot Yield Processing Gain

    • B.

      If Bandwidth Divided By Data Rate

    • C.

      Chip Rate Divided By Data Rate

    • D.

      The Code Repeat-Length Times Beta Factor

    Correct Answer
    C. Chip Rate Divided By Data Rate
    Explanation
    Processing gain in a spread spectrum communication system can be approximated by dividing the chip rate by the data rate. This approximation is based on the fact that the chip rate represents the rate at which the spreading code is transmitted, while the data rate represents the rate at which the actual information is transmitted. By dividing the chip rate by the data rate, we get an estimate of the increase in signal power due to the spreading process, which is known as the processing gain.

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