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Home ‣ Electronics ‣ Alternating Current vs Direct Current See What Others Are Saying!
  • Question

  • Power companies supply ac, not dc, because:


  • Options
  • A. it is easier to transmit ac
  • B. there is no longer a need for dc
  • C. dc is more dangerous
  • D. there are not enough batteries

  • Correct Answer
  • it is easier to transmit ac 

    • More questions

    • 1. Bleeder current is the total current left after the total divider current is subtracted from the total current into the circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The content of a simple programmable logic device (PLD) consists of:

    • Options
    • A. fuse-link arrays
    • B. thousands of basic logic gates
    • C. advanced sequential logic functions
    • D. thousands of basic logic gates and advanced sequential logic functions
      • Discuss
    • 3. The difference between the upper and lower trigger points is called the Schmitt trigger.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. 

      In the given circuit, what must the pulse width and time between pulses be to allow the capacitor to completely charge by the end of each pulse and to completely discharge between each pulse?


    • Options
    • A. 940 µs
    • B. 2.82 ms
    • C. 3.76 ms
    • D. 4.7 ms
      • Discuss
    • 5. If four 10 kΩ resistors are in series with a single 20 kΩ resistor and one of the parallel resistors shorts, the voltage across the other parallel resistors ________.

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. drops to zero
      • Discuss
    • 6. For inductions in series, LT = L1 + L2 + L3 +...

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. 

      It takes ______ for the output voltage in the given circuit to reach its maximum value.


    • Options
    • A. 0 s
    • B. 243.9 µs
    • C. 1 ms
    • D. 1.22 ms
      • Discuss
    • 8. 

      The output voltage in the given circuit is _____ at the end of the second pulse.


    • Options
    • A. 1.06 V
    • B. 7.56 V
    • C. 3.32 V
    • D. 12 V
      • Discuss
    • 9. If the input to a comparator is a sine wave, the output is a(n) _________.

    • Options
    • A. ramp voltage
    • B. sine wave
    • C. sawtooth wave
    • D. rectangular wave
      • Discuss
    • 10. The input resistance of the base of an emitter-follower is usually _________.

    • Options
    • A. very low
    • B. very high
    • C. shorted to ground
    • D. open
      • Discuss

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