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Electronics Quizzes & Trivia

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Questions and Answers
  • 1. 

    Which of the following statements best describe a class A transistor amplifier?

    • A.

      Each Transistor Is In Its Active Region For Significantly Less Than Half The Signal Cycle

    • B.

      Each Transistor Is In Its Active Region For The Entire Signal Cycle

    • C.

      Transistor Current Flows For More Than Half But Less Than The Entire Cycle

    • D.

      Each Transistor Is In Its Active Region For Approximately Half The Signal Cycle

    Correct Answer
    B. Each Transistor Is In Its Active Region For The Entire Signal Cycle
    Explanation
    A class A transistor amplifier is characterized by the fact that each transistor is in its active region for the entire signal cycle. This means that the transistor is conducting current for the entire duration of the input signal, allowing for a high level of amplification and accuracy in signal reproduction. This also means that the amplifier operates in a linear mode, without any distortion or clipping of the signal.

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  • 2. 

    In class AB operation, the output transistors are arranged in complimentary pairs. What does a complimentary pair consist of?

    • A.

      One Mosfet And One Jfet

    • B.

      Two Matched Npn Transistors

    • C.

      One Bipolar Junction Transistor And One Mosfet

    • D.

      One Npn Transistor And One Pnp Transistor

    Correct Answer
    D. One Npn Transistor And One Pnp Transistor
    Explanation
    A complimentary pair consists of one NPN transistor and one PNP transistor. In class AB operation, these transistors are arranged in such a way that one conducts during the positive half cycle of the input signal while the other conducts during the negative half cycle. This arrangement allows for efficient amplification of the input signal with minimal distortion.

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  • 3. 

    In the early days of computers, what were 4 bits called?

    • A.

      Half Speed

    • B.

      None Of These Choices

    • C.

      Nibble

    • D.

      Narrow Channel Architecture

    Correct Answer
    C. Nibble
    Explanation
    In the early days of computers, 4 bits were referred to as a "nibble". This term was used to describe a group of 4 binary digits, which could represent a single hexadecimal digit. The term "nibble" was coined as a play on words, combining the words "half" and "byte" to represent half of a byte, which consists of 8 bits. This term was commonly used in early computer systems and programming languages to describe a small unit of data.

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  • 4. 

    Palm manufactures what type of computer?

    • A.

      Handheld

    • B.

      Mainframe

    • C.

      Laptop

    • D.

      Backlit

    Correct Answer
    A. Handheld
    Explanation
    Palm manufactures handheld computers. Handheld computers are small, portable devices that can be held and operated with one hand. These devices are designed for personal and on-the-go use, offering features such as touchscreens, wireless connectivity, and various applications. Palm, a company known for its PalmPilot and Palm Treo devices, specializes in producing handheld computers that cater to the needs of individuals who require mobility and convenience in their computing devices.

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  • 5. 

    Which electrical wire size has the largest diameter?

    • A.

      14 Gauge

    • B.

      18 Gauge

    • C.

      38 Gauge

    • D.

      12 Gauge

    Correct Answer
    D. 12 Gauge
    Explanation
    The electrical wire size is determined by its gauge, with a lower gauge indicating a larger diameter. Therefore, the wire with the largest diameter would be the one with the lowest gauge. In this case, 12 Gauge has the lowest gauge among the given options, so it has the largest diameter.

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  • 6. 

    A 24 dB per octave filter is how many dB down at the crossover frequency?

    • A.

      12

    • B.

      6

    • C.

      24

    • D.

      3

    Correct Answer
    B. 6
    Explanation
    A 24 dB per octave filter is 6 dB down at the crossover frequency. This is because the crossover frequency is the point at which the filter starts attenuating the signal, and a 24 dB per octave filter attenuates the signal by 6 dB for every octave above the crossover frequency. Therefore, at the crossover frequency, the filter is 6 dB down.

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  • 7. 

    How can you calculate the Xmax of a woofer?

    • A.

      Any One Of The Methods Above

    • B.

      Apply A 1 Watt Signal At 1khz And Measure The Distance The Cone Moves Forward

    • C.

      Measure The Voice Coil Length, Subtract Out The Air Gap Height, And Divide By 2

    • D.

      Measure The Piston Area And Divide By 4

    Correct Answer
    C. Measure The Voice Coil Length, Subtract Out The Air Gap Height, And Divide By 2
    Explanation
    To calculate the Xmax of a woofer, one can measure the voice coil length, subtract the air gap height, and divide the result by 2. This method helps determine the maximum linear excursion of the woofer's cone, which is the maximum distance the cone can move forward or backward from its resting position. By subtracting the air gap height, which is the distance between the voice coil and the magnet, from the voice coil length, we can obtain an accurate measurement of the cone's maximum excursion. Dividing the result by 2 gives us the Xmax value.

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  • 8. 

    The getter is a metal ring usually at the top of the vacuum tube. What is its main function?

    • A.

      None Of These Choices

    • B.

      Heat The Filament Wire

    • C.

      To Consume Unwanted Gas Molecules

    • D.

      Provide Electron Flow

    Correct Answer
    C. To Consume Unwanted Gas Molecules
    Explanation
    The correct answer is "To Consume Unwanted Gas Molecules." The getter in a vacuum tube is a metal ring that is used to remove or absorb any unwanted gas molecules that may be present in the tube. This helps to maintain a high vacuum inside the tube, which is necessary for the proper functioning of the tube. The getter acts as a trap for the gas molecules, preventing them from interfering with the electron flow and other processes happening inside the tube.

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  • 9. 

    In a push-pull output stage, if a pentode vacuum tube is connected as a triode, which of the following will happen?

    • A.

      It's Impossible To Connect A Pentode As A Triode

    • B.

      Distortion Is Lowered And Output Power Is Decreased

    • C.

      Distortion Is Lowered And Output Power Is Increased

    • D.

      Distortion Is Increased And Output Power Is Increased

    Correct Answer
    B. Distortion Is Lowered And Output Power Is Decreased
    Explanation
    When a pentode vacuum tube is connected as a triode in a push-pull output stage, the distortion is lowered and the output power is decreased. This is because the pentode tube, when operated as a triode, has a lower gain and higher internal resistance compared to its normal operation as a pentode. This results in a reduction in distortion but also a decrease in output power.

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  • 10. 

    What is the value of a small capacitor marked 104?

    • A.

      1 uF

    • B.

      .1 uF

    • C.

      10.4 uF

    • D.

      10 uF

    Correct Answer
    B. .1 uF
    Explanation
    The value of a small capacitor marked 104 is .1 uF. Capacitors are often marked with a numerical code to represent their capacitance value. In this case, the code "104" indicates that the capacitance is 10 followed by 4 zeros, which translates to .1 uF.

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  • 11. 

    The components in an IC chip are electrically isolated from each other by what?

    • A.

      A Layer Of Undoped Silicon

    • B.

      Pn Junctions Between Each Component And The P-Type Substrate

    • C.

      A Layer Of Silicon Oxide Between The Components And Substrate

    • D.

      They Are Not Isolated

    Correct Answer
    B. Pn Junctions Between Each Component And The P-Type Substrate
    Explanation
    The components in an IC chip are electrically isolated from each other by Pn Junctions between each component and the P-Type Substrate. This is because Pn Junctions are formed by doping the silicon substrate with impurities to create regions of different electrical conductivity. The P-Type Substrate acts as a base for the components, and the Pn Junctions prevent the flow of current between the components, ensuring electrical isolation.

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  • 12. 

    If you have a rectified power source and the output has high ripple, what would could you use to cut the ripple?

    • A.

      A Capacitor

    • B.

      A Diode

    • C.

      A Resistor

    • D.

      A Chassis Ground

    Correct Answer
    A. A Capacitor
    Explanation
    A capacitor can be used to cut the ripple in the output of a rectified power source. When connected in parallel with the load, the capacitor acts as a filter and smooths out the voltage waveform by storing and releasing electrical energy. It helps to reduce the amplitude of the ripple voltage, resulting in a more stable and regulated output.

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  • 13. 

    What is the frequency location, in megahertz(MHz), set aside by the FCC for citizen's band emergency channel 9?

    • A.

      150.950 Mhz

    • B.

      9.11 Mhz

    • C.

      26.985 Mhz

    • D.

      27.065 Mhz

    Correct Answer
    D. 27.065 Mhz
    Explanation
    The correct answer is 27.065 MHz. The Federal Communications Commission (FCC) has set aside this frequency for the citizen's band emergency channel 9. This channel is designated for emergency communication purposes, allowing citizens to call for help or report emergencies.

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  • 14. 

    Which processor uses memory bank switching signals?

    • A.

      8086

    • B.

      8252

    • C.

      8051

    • D.

      8088

    Correct Answer
    A. 8086
    Explanation
    The 8086 processor uses memory bank switching signals. Memory bank switching is a technique used to access more memory than the processor's address space can directly handle. It allows the processor to switch between different memory banks, effectively expanding the available memory. The 8086 processor, which was introduced by Intel in 1978, was one of the first processors to support memory bank switching, making it capable of accessing larger amounts of memory compared to earlier processors.

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  • 15. 

    What company makes the only microturbine?

    • A.

      Capstone

    • B.

      Enertech

    • C.

      Whisper Technologies

    • D.

      Electrion

    Correct Answer
    A. Capstone
    Explanation
    Capstone is the correct answer because it is the only company mentioned in the options that specializes in microturbines. Enertech, Whisper Technologies, and Electrion are not known for manufacturing microturbines. Therefore, Capstone is the most likely company that makes the only microturbine.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 19, 2015
    Quiz Created by
    Alfredhook3
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