digital-electronics-mcqs - Set (2)

Correct Answer: Orange && Worng Answer: Red

1. Number of memory chips needed to design 16 Kilo byte memory if the memory if the memory chip size is 1024×1.

  • (A). 64
  • (B). 16
  • (C). 128
  • (D). 1024
    • View Answer

    Explanation: Not Avilable

    2. One nibble is equal to ______

  • (A). 8 bits
  • (B). 4 bits
  • (C). 6 bits
  • (D). 2 bits
    • View Answer

    Explanation: Not Avilable

    3. IC 74139 is ______

  • (A). A 2-to-4 line decoder
  • (B). A 4-to-16 line decoder
  • (C). A 16-to-1 line multiplexer
  • (D). A 8-to-1 line multiplexer
    • View Answer

    Explanation: Not Avilable

    4. Magnetic tape is coated with tiny particles of ______

  • (A). Ferric oxide
  • (B). Ferrous oxide
  • (C). Chromium dioxide
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    5. Which of the following is true for sampling theorem.

  • (A). Sampling frequency ≥ signal frequency
  • (B). Sampling frequency ≤ signal frequency
  • (C). Sampling frequency ≥ 2 x signal frequency
  • (D). Sampling frequency ≤ 2 x signal frequency
    • View Answer

    Explanation: Not Avilable

    6. Which of the following is the fastest A/D converter

  • (A). Successive approximation type
  • (B). Parallel compartor type
  • (C). Dual slope type
  • (D). Counting type
    • View Answer

    Explanation: Not Avilable

    7. For weighted resistor n-bit D/A converter, the resistor value of LSB is ______

  • (A). 2n-1.R
  • (B). 2n.R
  • (C). 2R
  • (D). R
    • View Answer

    Explanation: Not Avilable

    8. Pits and lands are related to ______

  • (A). Multivibrator
  • (B). CD-ROM
  • (C). Hard disk
  • (D). Clamper
    • View Answer

    Explanation: Not Avilable

    9. The magnetic flux lines are used to write data to ______

  • (A). A Hard-disk
  • (B). A CD-ROM
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    10. Which of the following is true for PROM

  • (A). The data pattern is defined after fabrication
  • (B). The data pattern is defined during fabrication
  • (C). It is a sequential memory
  • (D). It is reprogrammable
    • View Answer

    Explanation: Not Avilable

    11. The primary colours are

  • (A). Blue and red
  • (B). Red and green
  • (C). Blue, red and green
  • (D). Blue and green
    • View Answer

    Explanation: Not Avilable

    12. The number of comparators required for an 8 bit parallel comparator A/D converter is :

  • (A). 255
  • (B). 240
  • (C). 300
  • (D). 250
    • View Answer

    Explanation: Not Avilable

    13. A magnetic drum of 8″ diameter has 100 tracks and storage of 200 bits/inch. It storage capacity is :

  • (A). 502400 bits
  • (B). 8402 bits
  • (C). 1004800 bits
  • (D). 202900 bits
    • View Answer

    Explanation: Not Avilable

    14. Counter can be used in the measurement of :

  • (A). Frequency
  • (B). Time
  • (C). Distance
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    15. The maximum speed of electronic switch can be ______ operations per second.

  • (A). 104
  • (B). 10
  • (C). 1000
  • (D). 109
    • View Answer

    Explanation: Not Avilable

    16. The resolution of a 12 bit D/A converter is ______ of full scale output

  • (A). 1/4095
  • (B). 1/4000
  • (C). 1/3000
  • (D). 1/2000
    • View Answer

    Explanation: Not Avilable

    17. The maximum sampling rate time Ts of a 10 KHz sinusoidal voltage for conversion to digital form is :

  • (A). 0.05 sec
  • (B). 0.05 ms
  • (C). 0.05 μs
  • (D). 0.05 ns
    • View Answer

    Explanation: Not Avilable

    18. The access time of ROM using bipolar transistor is about :

  • (A). 1 sec.
  • (B). 1 m sec.
  • (C). 1 μ sec.
  • (D). 1 n sec.
    • View Answer

    Explanation: Not Avilable

    19. R-2R ladder network is used for :

  • (A). Resolving interrupt priority
  • (B). Parallel to serial conversion
  • (C). D/A conversion
  • (D). A/D conversion
    • View Answer

    Explanation: Not Avilable

    20. Which is known as one shot multivibrator :

  • (A). Astable
  • (B). Monostable
  • (C). Bistable
  • (D). None
    • View Answer

    Explanation: Not Avilable

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