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Home Digital Electronics Memory and Storage See What Others Are Saying!
  • Question
  • Which is not part of a hard disk drive?


  • Options
  • A. Spindle
  • B. Platter
  • C. Read/write head
  • D. Valve

  • Correct Answer
  • Valve 


  • More questions

    • 1. How is a J-K flip-flop made to toggle?

    • Options
    • A. J = 0, K = 0
    • B. J = 1, K = 0
    • C. J = 0, K = 1
    • D. J = 1, K = 1
    • Discuss
    • 2. The following combination is correct for an ODD parity data transmission system:
      data = 011011100 and parity = 0

    • Options
    • A. True
    • B. False
    • Discuss
    • 3. A major disadvantage of the mask ROM is that it:

    • Options
    • A. is time consuming to change the stored data when system requirements change
    • B. is very expensive to change the stored data when system requirements change
    • C. cannot be reprogrammed if stored data needs to be changed
    • D. has an extremely short life expectancy and requires frequent replacement
    • Discuss
    • 4. One disadvantage of the tracking A/D converter is:

    • Options
    • A. that it requires two counters?one for up and one for down.
    • B. that the binary output will oscillate between two binary states when the analog input is constant.
    • C. the need for an accurate clock reference for the counter.
    • D. the need for a latch and its associated control circuit.
    • Discuss
    • 5. Hexadecimal 44 is ________ in decimal.

    • Options
    • A. 6810
    • B. 7410
    • C. 7710
    • D. 9810
    • Discuss
    • 6. The CPU contains all the circuitry for ________.

    • Options
    • A. storing data
    • B. keeping track of time
    • C. fetching and interpreting instructions
    • D. Internet operations
    • Discuss
    • 7. The Q output of a flip-flop is normally HIGH when the device is in the "CLEAR" or "RESET" state.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. What must be done to interface TTL to CMOS?

    • Options
    • A. A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
    • B. As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the TTL is limited to five CMOS gates.
    • C. A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates.
    • D. A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node.
    • Discuss
    • 9. The input levels to a flip-flop must be maintained for a minimum time period both before and after the edge of the clock signal is applied.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. A Celsius thermometer is an application for the 8051 microcontroller.

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


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