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ECE :: Digital Electronics

  1. In 8085 microprocessor, how many I/O ports can be accessed by direct method?

  2. A.
    8
    B.
    256
    C.
    32 K
    D.
    64 K

  3. If the mantissa of a digital computer is 37 bit long then the accuracy of the digital computer will be of

  4. A.
    37 decimal places
    B.
    23 decimal places
    C.
    11 decimal places
    D.
    accuracy is independent of the length to mantissa

  5. Bipolar IC memories are fabricated using

  6. A.
    high density versions of the bipolar transistor flip-flop
    B.
    low density versions of the unipolar transistor flip-flop
    C.
    high density versions of the MOSFET
    D.
    low density versions of the MOSFET

  7. The circuit in the given figure is

  8. A.
    half adder
    B.
    full adder
    C.
    half subtractor
    D.
    full subtractor

  9. A D-flip-flop is

  10. A.
    dial type flip-flop
    B.
    delay flip-flop
    C.
    differential flip-flop
    D.
    digital flip-flop

  11. The fetching, decoding and executing of an instruction is broken down into several time intervals. Each of these intervals, involving one or more clock periods, is called a

  12. A.
    instruction cycle
    B.
    machine cycle
    C.
    process cycle
    D.
    none of the above

  13. The output of the circuit shown below will be of the frequency

  14. A.
    125 Hz
    B.
    250 Hz
    C.
    500 Hz
    D.
    750 Hz

  15. In the given figure Y =

  16. A.
    A
    B.
    B
    C.
    A + B + C
    D.
    ABC

  17. Assertion (A): An encoder converts key dips to binary code.

    Reason (R): An encoder has more inputs than output.

  18. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

  19. If a RAM has 34 bits in its MAR and 16 bits in its MDR, then its capacity will be

  20. A.
    32 GB
    B.
    16 GB
    C.
    32 MB
    D.
    16 MB