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Home ‣ Digital Electronics ‣ Digital System Projects Using HDL See What Others Are Saying!
  • Question

  • In the frequency counter, if the clock generator produces a 100 kHz system clock signal, how many decade counters are required to measure 1 Hz?


  • Options
  • A. 6
  • B. 5
  • C. 4
  • D. 3

  • Correct Answer
  • 5 

    • More questions

    • 1. The MOD-10 counter is also referred to as a ________ counter.

    • Options
    • A. decade
    • B. strobing
    • C. BCD
    • D. circuit
      • Discuss
    • 2. The look-ahead-carry adder is slower than the ripple-carry adder because it requires additional logic circuits.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 4. Propagation delay in TTL is due to slow switching speeds.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. An OR gate with inverted inputs functions as:

    • Options
    • A. an AND gate.
    • B. a NAND gate.
    • C. a NOR gate.
    • D. an inverter.
      • Discuss
    • 6. Exclusive-AND gates are needed for conversions between Gray code and binary code.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A circuit that can convert one of ten numerical keys pressed on a keyboard to BCD is a ________.

    • Options
    • A. priority encoder
    • B. decoder
    • C. multiplexer
    • D. demultiplexer
      • Discuss
    • 8. Refer to the keyboard encoder in figure (a). Sometimes when the 5 key is pressed, the system attached to the keypad does not respond. The 5 input on the 74147 is monitored with a digital storage scope while repeatedly pressing the 5 key, and the waveform in figure (b) is obtained; the P above the trace indicates the points at which the technician pressed the key. What is most likely wrong with the circuit?


    • Options
    • A. The switches on the 5 key are intermittent; the contacts need to be cleaned or the switch replaced.
    • B. The pull-up resistor connected to the 5 key is bad and should be replaced.
    • C. The common ground connection at the bottom of the 0 key has a bad solder connection; repair the connection.
    • D. The 74147 is intermittent, possibly due to high temperature, and should be replaced.
      • Discuss
    • 9. The 8085 software is compatible with the 8080A.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Digital systems are called ________.

    • Options
    • A. binary systems
    • B. logic systems
    • C. numbering systems
    • D. ADC systems
      • Discuss

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