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  • Question
  • An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?


  • Options
  • A. Doping
  • B. Valence electrons
  • C. Free electrons
  • D. Thermal energy
  • E. None of the above

  • Correct Answer
  • Thermal energy 


  • Electronic Principles problems


    Search Results


    • 1. The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?

    • Options
    • A. 1750 mA
    • B. 17.5 mA
    • C. 175 mA
    • D. 1.75 mA
    • E. None of the above
    • Discuss
    • 2. Current can flow through a normally open push button switch as long as:

    • Options
    • A. you are pressing the button
    • B. you are not pressing the button
    • C. its contact remain open
    • D. its contact remain open
    • E. None of the above
    • Discuss
    • 3. How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?

    • Options
    • A. 0.24 W
    • B. 0.625 W
    • C. 80 W
    • D. 325 kW
    • E. None of the above
    • Discuss
    • 4. Which one of the following statements is true?

    • Options
    • A. Power dissipation of a pure inductor decreases with operating frequency
    • B. Power dissipation of a pure inductor is at a maximum for dc source voltages
    • C. Power dissipation of a pure inductor increases with operating frequency
    • D. There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency
    • E. None of the above
    • Discuss
    • 5. Which is the most widely used semiconductor?

    • Options
    • A. Copper
    • B. Silicon
    • C. Germanium
    • D. All of the above
    • E. None of the above
    • Discuss
    • 6. When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:

    • Options
    • A. parallel RL circuit
    • B. parallel RC circuit
    • C. parallel RLC circuit operated above its resonant frequency
    • D. purely resistive circuit
    • E. None of the above
    • Discuss
    • 7. A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

    • Options
    • A. 15 V
    • B. 16 V
    • C. 7.5 V
    • D. 8 V
    • E. None of the above
    • Discuss
    • 8. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

    • Options
    • A. 28.4 mA
    • B. 24.2 mA
    • C. 34.4 mA
    • D. 68.4 mA
    • E. None of the above
    • Discuss
    • 9. Doubling the operating frequency of a purely capacitive circuit:

    • Options
    • A. has no effect on the total circuit current
    • B. doubles the amount of total current
    • C. cuts the total current by one-half
    • D. thrice the amount of total current
    • E. None of the above
    • Discuss
    • 10. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?

    • Options
    • A. 60 Ohm
    • B. 99.3 Ohm
    • C. 250 Ohm
    • D. 70.7Ohm
    • E. None of the above
    • Discuss


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