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Home Electronics Semiconductor Principles Comments

  • Question
  • Which semiconductor material is made from coal ash?


  • Options
  • A. germanium
  • B. silicon
  • C. tin
  • D. carbon

  • Correct Answer
  • germanium 


  • Semiconductor Principles problems


    Search Results


    • 1. Which of the following cannot actually move?

    • Options
    • A. majority carriers
    • B. ions
    • C. holes
    • D. free electrons
    • Discuss
    • 2. One problem with mechanically variable resistors is noticeable in audio circuits as:

    • Options
    • A. scratchy noise
    • B. lack of bass response
    • C. variable volume
    • D. too much treble response
    • Discuss
    • 3. With Ohm's law, no change in resistance means that current and voltage will be:

    • Options
    • A. directly proportional
    • B. unable to produce energy
    • C. the same
    • D. inversely proportional
    • Discuss
    • 4. A wire with a smaller cross-sectional area will produce:

    • Options
    • A. less heat
    • B. more conductance
    • C. less resistance
    • D. more heat
    • Discuss
    • 5. A 33 kΩ resistor with a 20% tolerance checks out as ok with which of the following ohmmeter readings?

    • Options
    • A. 26400 ohms
    • B. 24183 ohms
    • C. 6600 ohms
    • D. 39970 ohms
    • Discuss
    • 6. In "p" type material, minority carriers would be:

    • Options
    • A. holes
    • B. dopants
    • C. slower
    • D. electrons
    • Discuss
    • 7. When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is this gap called?

    • Options
    • A. energy gap
    • B. hole
    • C. electron-hole pair
    • D. recombination
    • Discuss
    • 8. Ionization within a P-N junction causes a layer on each side of the barrier called the:

    • Options
    • A. junction
    • B. depletion region
    • C. barrier voltage
    • D. forward voltage
    • Discuss
    • 9. Silicon atoms combine into an orderly pattern called a:

    • Options
    • A. covalent bond
    • B. crystal
    • C. semiconductor
    • D. valence orbit
    • Discuss
    • 10. Which material may also be considered a semiconductor element?

    • Options
    • A. carbon
    • B. ceramic
    • C. mica
    • D. argon
    • Discuss


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