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Home ‣ Digital Electronics ‣ Multivibrators and 555 Timer Comments
  • Question

  • A monostable multivibrator is commonly called a two shot.


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  • A. True
  • B. False

  • Correct Answer
  • False 

    • Multivibrators and 555 Timer problems

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    • 1. A multivibrator is a circuit that changes between two digital levels on a continuous, free-running basis or on demand.

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    • A. True
    • B. False
      • Discuss
    • 2. The 74S124 TTL chip is a voltage-controlled oscillator that will generate a specific frequency at Vout.

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    • A. True
    • B. False
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    • 3. Timing accuracy of more than eight significant digits can be easily achieved by using quartz crystals.

    • Options
    • A. True
    • B. False
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    • 4. When the 74123, a retriggerable monostable multivibrator device, ends its timing cycle it must be started all over again.

    • Options
    • A. True
    • B. False
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    • 5. A comparator simply outputs a HIGH or LOW based on a comparison of the voltage levels at its input.

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    • A. True
    • B. False
      • Discuss
    • 6. The 8051 is a 40-pin IC. Twenty-two pins are needed for the four I/O ports.

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    • A. True
    • B. False
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    • 7. Different instruction sets must make up for the various members of the 8051 family.

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    • A. True
    • B. False
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    • 8. The RST pin requires a HIGH to reset the 8051 microcontroller.

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    • A. True
    • B. False
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    • 9. Up to 65K of code memory and 65K of data memory can be added to any of the 8051 family members.

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    • A. True
    • B. False
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    • 10. In an 8051 program DA A adjusts the value in the accumulator resulting from an addition into two BCDs.

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    • A. True
    • B. False
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