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  • Question

  • The output of a standard TTL NAND gate is used to pull an LED indicator LOW. The LED is in series with a 470-Ω resistor. What is the current in the circuit when the LED is on?


  • Options
  • A. 7.02 mA
  • B. 8.51 mA
  • C. 10.63 mA
  • D. 5.32 mA

  • Correct Answer
  • 7.02 mA 

    • More questions

    • 1. The output of this circuit is always ________.


    • Options
    • A. 1
    • B. 0 
    • C. A
    • D. A
      • Discuss
    • 2. DRAM chips can be combined for larger capacity and word sizes using the same methods as for other memory types.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Flash A/D converters depend on an input clock pulse to perform each conversion.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Electrical noise does not affect the transmission of binary information.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. What is wrong, if anything, with the circuit in the given figure based on the logic analyzer display accompanying the circuit?


    • Options
    • A. The CO terminal is shorted to ground.
    • B. The S1 output is shorted to Vcc.
    • C. The P1 input is not being added into the total.
    • D. Nothing is wrong; the circuit is functioning correctly.
      • Discuss
    • 6. Convert each of the decimal numbers to 8-bit two's-complement form and then perform subtraction by taking the two's-complement and adding.


    • Options
    • A. 0001  0011
    • B. 0000  1110
    • C. 0010  1110
    • D. 1110  0000
      • Discuss
    • 7. If A is LOW or B is LOW or BOTH are LOW, then X is LOW. If A is HIGH and B is HIGH, then X is HIGH. These rules specify the operation of a(n) ________.

    • Options
    • A. AND gate
    • B. OR gate
    • C. NAND gate
    • D. XOR gate
      • Discuss
    • 8. SOP stands for sum-of-powers.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Which type of device may be used to interface a parallel data format with external equipment's serial format?

    • Options
    • A. key matrix
    • B. UART
    • C. memory chip
    • D. series in, parallel out
      • Discuss
    • 10. The 1's complement of a binary number is derived by changing 0s to 1s and 1s to 0s.

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

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