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  • Question
  • A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?


  • Options
  • A. 310 Ohm
  • B. 400 Ohm
  • C. 410 Ohm
  • D. 550 Ohm
  • E. None of the above

  • Correct Answer
  • 410 Ohm 


  • Electronic Principles problems


    Search Results


    • 1. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?

    • Options
    • A. 3.75 mA
    • B. 3.2 mA
    • C. 0.05 mA
    • D. 13 mA
    • E. None of the above
    • Discuss
    • 2. The rms value of a sine waveform is:

    • Options
    • A. the number of cycles completed in one second
    • B. the time required to complete one full cycle
    • C. equal to 0.707 times the peak amplitude
    • D. equal to 1.41 times the peak amplitude
    • E. None of the above
    • Discuss
    • 3. A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

    • Options
    • A. 0.1 A
    • B. 1000 A
    • C. 10 A
    • D. 100 A
    • E. None of the above
    • Discuss
    • 4. Which one of the following kinds of materials has the lowest permeability?

    • Options
    • A. A diamagnetic material
    • B. A paramagnetic material
    • C. A feiTomagnetic material
    • D. All of the above
    • E. None of the above
    • Discuss
    • 5. A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?

    • Options
    • A. 60 Ohm
    • B. 50 Ohm
    • C. 100 Ohm or more
    • D. 10 Ohm
    • E. None of the above
    • Discuss
    • 6. How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?

    • Options
    • A. 0.02 A
    • B. 0.955 A
    • C. 10 A
    • D. 2.02 A
    • E. None of the above
    • Discuss
    • 7. Which one of the following phrases best describes residual magnetism?

    • Options
    • A. Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
    • B. The force of attraction between the poles of a permanent and temporary magnetic field
    • C. The amount of magnetic flux that is not confined to the core material of an electromagnet
    • D. The circular magnetic field that surrounds a conductor carrying a current
    • E. None of the above
    • Discuss
    • 8. What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

    • Options
    • A. Electronical energy
    • B. Mechanical energy
    • C. Chemical energy
    • D. Solar energy
    • E. None of the above
    • Discuss
    • 9. A farad is defined as the amount of capacitance necessary for:

    • Options
    • A. dissipating 1 W of power
    • B. causing an ac phase shift greater than 90 degree
    • C. storing 1 V for 1 second
    • D. changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
    • E. None of the above
    • Discuss
    • 10. The equivalent of 1 micro A is:

    • Options
    • A. 10000A
    • B. 1000 A
    • C. one-millionth of an ampere
    • D. one million amperes
    • E. None of the above
    • Discuss


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