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  • Question
  • 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

  • Correct Answer
  • changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing 


  • Electronic Principles problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • Discuss
    • 5. 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
    • 6. 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
    • 7. Doubling the number of turns of wire in an inductor:

    • Options
    • A. reduces the value of inductance by one-half
    • B. multiplies the value of inductance by two
    • C. multiplies the value of inductance by four
    • D. reduces the value of inductance by one-fourth
    • E. None of the above
    • Discuss
    • 8. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm

    • Options
    • A. 180 degree
    • B. 30 degree
    • C. 45 degree
    • D. 75 degree
    • E. None of the above
    • Discuss
    • 9. If a load resistance is 1 kW, a stiff current source has a resistance of

    • Options
    • A. At least 10 Ohm
    • B. Less than 10 Ohm
    • C. More than 100 k Ohm
    • D. Less than 100 k Ohm
    • E. None of the above
    • Discuss
    • 10. For a pure capacitor:

    • Options
    • A. ac current and voltage are exactly in phase
    • B. ac current leads the voltage by 90 degree
    • C. ac current is converted to dc voltage
    • D. ac current lags the voltage by 90 degree
    • E. None of the above
    • Discuss


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