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  • Question
  • Holes act like:


  • Options
  • A. Atoms
  • B. Crystals
  • C. Negative charges
  • D. Positive charges
  • E. None of the above

  • Correct Answer
  • Positive charges 


  • Electronic Principles problems


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    • 1. Which one of the following statements applies to common, non-rechargeable flashlight batteries?

    • Options
    • A. Common flashlight batteries are secondary wet-cell batteries
    • B. Common flashlight batteries are primary wet-cell batteries
    • C. Common flashlight batteries are primary dry-cell batteries
    • D. Common flashlight batteries are secondary dry-cell batteries
    • E. None of the above
    • Discuss
    • 2. A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

    • Options
    • A. 12 V
    • B. 18 V
    • C. 24 V
    • D. 30 V
    • E. None of the above
    • Discuss
    • 3. Doubling the operating frequency of a capacitive circuit:

    • Options
    • A. doubles the amount of a capacitive reactance
    • B. has no effect on the capacitive reactance
    • C. cuts the capacitive reactance in half
    • D. multiplies the capacitive reactance by 6.28
    • E. None of the above
    • Discuss
    • 4. When operating below 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
    • 5. When a series RLC circuit is operating at its resonant frequency:

    • Options
    • A. capacitive reactance is greater than the inductive reactance
    • B. inductive reactance is greater than the capacitive reactance
    • C. inductive reactance is equal to the capacitive reactance
    • D. the difference between inductive and capacitive reactance is equal to the resistance
    • E. None of the above
    • Discuss
    • 6. Which one of the following statements most accurately reflects the nature of ac power?

    • Options
    • A. The current in an ac circuit flows in one direction, but changes value periodically
    • B. The current in an ac circuit flows in one direction at a steady level
    • C. The current in an ac circuit changes direction periodically
    • D. The current in an ac circuit flows in two directions at the same time
    • E. None of the above
    • Discuss
    • 7. The period of a waveform is:

    • Options
    • A. the time required to complete one full cycle
    • B. the number of cycles completed in one second
    • C. the time required for the voltage to rise from 10% to 90% of the peak amplitude
    • D. equal to 0.707 times the peak amplitude
    • E. None of the above
    • Discuss
    • 8. The current gain of a transistor is defined as the ratio of the collector current to the

    • Options
    • A. base current
    • B. emitter current
    • C. supply current
    • D. collector current
    • E. None of the above
    • Discuss
    • 9. Which one of the following statements regarding ac circuits is correct?

    • Options
    • A. Current and voltage are in phase through an inductor
    • B. Current leads the voltage through an inductor
    • C. Current lags the voltage through an inductor
    • D. All of the above
    • E. None of the above
    • Discuss
    • 10. At room temperature an intrinsic silicon crystal acts approximately like

    • Options
    • A. a battery
    • B. a conductor
    • C. an insulator
    • D. a piece of copper wire
    • E. None of the above
    • Discuss


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