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  • Question
  • The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?


  • Options
  • A. 250 ?A
  • B. 350 ?A
  • C. 0.25 ?A
  • D. 300 ?A
  • E. None of the above

  • Correct Answer
  • 250 ?A 


  • Electronic Principles problems


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    • 1. When the collector current increases, what does the current gain do?

    • Options
    • A. decreases
    • B. stays the same
    • C. increases
    • D. any of the above
    • E. None of the above
    • Discuss
    • 2. Which one of the following statements is true for the voltages in a series RC circuit?

    • Options
    • A. The total voltage is equal to the sum of the voltages across the resistance and capacitance
    • B. The voltage always has the same amplitude and phase for every part of the circuit
    • C. The total voltage is less than the sum of the voltages across the resistance and capacitance
    • D. The total voltage is greater than the sum of the voltages across the resistance and capacitance
    • E. None of the above
    • Discuss
    • 3. Holes are the minority carriers in which type of semiconductor?

    • Options
    • A. Extrinsic
    • B. Intrinsic
    • C. n-type
    • D. p-type
    • E. None of the above
    • Discuss
    • 4. The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

    • Options
    • A. rotor
    • B. armature
    • C. battery
    • D. commutator
    • E. None of the above
    • Discuss
    • 5. A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?

    • Options
    • A. 4.73
    • B. 0.4 V
    • C. 24 V
    • D. 600 V
    • E. None of the above
    • Discuss
    • 6. What form of energy is used for creating static electricity?

    • Options
    • A. Solar energy
    • B. Mechanical energy
    • C. Chemical energy
    • D. Light energy
    • E. None of the above
    • Discuss
    • 7. Which one of the following statements best applies to a parallel RLC circuit?

    • Options
    • A. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
    • B. The sum of the current is always less than the applied current
    • C. The current waveform for each component always has the same amplitude and phase as the applied current
    • D. All of the above
    • E. None of the above
    • Discuss
    • 8. Which one of the following statements best describes magnetic hysteresis?

    • Options
    • A. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
    • B. Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
    • C. Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
    • D. Hysteresis is most apparent when the core material is saturated
    • E. None of the above
    • Discuss
    • 9. The total inductance of a series inductor circuit is:

    • Options
    • A. equal to the sum of the individual inductance values
    • B. equal to the sum of the individual inductive-reactance values
    • C. less than the value of the smallest inductor
    • D. equal to the source voltage divided by total current
    • E. None of the above
    • Discuss
    • 10. Molecule is

    • Options
    • A. The smallest particle of a substance that retains the properties of that substance
    • B. A atom that has a shortage of electrons in its outer orbit
    • C. A atom that has an excessive number of electrons in its outer orbit
    • D. A atom that flows whenever there is an imbalance of electrical charges between two points
    • E. None of the above
    • Discuss


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