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ECE :: Digital Electronics

  1. Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ADI A4H?

  2. A.
    4 AH, 0
    B.
    4 AH, 1
    C.
    4 BH, 0
    D.
    4 BH, 1

  3. In a monolithic IC, resistors are formed from

  4. A.
    ceramic material
    B.
    manganin wire
    C.
    P-type semiconductor
    D.
    aluminium ribbon

  5. For wired AND connection we should use

  6. A.
    TTL gates with active pull up
    B.
    TTL gates with open collector
    C.
    TTL gates without active pull up and with open collector
    D.
    any of the above

  7. A + AB =

  8. A.
    A
    B.
    A
    C.
    A + B
    D.
    A + B

  9. The resolution of a 12-bit D/A converter using a binary ladder with + 10V as the full scale output will be

  10. A.
    2.44 mV
    B.
    3.50 mV
    C.
    4.32 mV
    D.
    5.12 mV

  11. In the above case the hexadecimal notation for the last memory location is

  12. A.
    0000
    B.
    FFFF
    C.
    3FFF
    D.
    5FFF

  13. What is the length of SP (Stack pointer) of 8085 μp?

  14. A.
    6 bits
    B.
    8 bits
    C.
    12 bits
    D.
    16 bits

  15. Shifting digits from left to right and vice versa is needed in

  16. A.
    storing numbers
    B.
    arithmetic operations
    C.
    counting
    D.
    storing and counting

  17. Current requirement of a piezo buffer is about

  18. A.
    100mA
    B.
    20mA
    C.
    4mA
    D.
    0.4mA

  19. Consider the following instruction of 8085 μp :

    1. MOV M, A
    2. AODC
    3. MVI A, FF
    4. CMP M
    Which of these cause change in the status of flag(s)?

  20. A.
    1 and 2
    B.
    1, 2 and 3
    C.
    3 and 4
    D.
    2 and 4