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Home ‣ Digital Electronics ‣ MSI Logic Circuits See What Others Are Saying!
  • Question

  • There appears to be a problem with a 7-segment display on a DMM sometimes skipping certain numbers. How would you test the display?


  • Options
  • A. Remove the display unit and check each segment diode with an ohmmeter. Replace the defective segments.
  • B. Apply 5 V directly to each segment of the display and check for individual segment operation. Replace any segment that has voltage applied but is not lit.
  • C. Tie all of the segments together and connect to Vcc; the number 8 should appear on the display. Now check the display supply voltage to determine if the display is receiving the correct voltage.
  • D. Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad.

  • Correct Answer
  • Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad. 

    • More questions

    • 1. A typical RAM will read (place stored data on its outputs) whenever the Chip Select line is active and the Write Enable line is inactive.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Convert binary 1001 to hexadecimal.

    • Options
    • A. 916
    • B. 1116
    • C. 10116
    • D. 1016
      • Discuss
    • 3. Convert the following octal number to binary.
      768

    • Options
    • A. 1101112
    • B. 1111102
    • C. 1111002
    • D. 1001112
      • Discuss
    • 4. One form of a sigma/delta modulator circuit is designed to convert a continuous analog signal into a modulated bit stream (A/D).

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The term CLEAR always means that .

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The characteristic that a change of one binary step on the input of a DAC should cause exactly one step change on the output is called ________.

    • Options
    • A. resolution
    • B. linearity
    • C. monotonicity
    • D. accuracy
      • Discuss
    • 7. The memory operation that presents data on the memory outputs after entering a new address is called ________.

    • Options
    • A. a read cycle
    • B. a write cycle
    • C. a refresh cycle
    • D. a chip select
      • Discuss
    • 8. How many address bits are required for a 4096-bit memory organized as a 512 × 8 memory?

    • Options
    • A. 2
    • B. 4
    • C. 8
    • D. 9
      • Discuss
    • 9. What is the difference between the enable input of the 7475 and the clock input of the 7474?

    • Options
    • A. The 7475 is edge-triggered.
    • B. The 7474 is edge-triggered.
      • Discuss
    • 10. Assembly language is written using mnemonics: MVI, DCR, JZ.

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

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