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ECE :: Microprocessors

  1. Assertion (A): Microprocessor 8085 has 16 address bus lines and 8 data bus lines.

    Reason (R): Address bus in 8085 is unidirectional.

  2. 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 correct R is wrong
    D.
    A is wrong R is correct

  3. IC 74181 has two select lines.

  4. A.
    True
    B.
    False

  5. Plug and play is a hardware specification.

  6. A.
    True
    B.
    False

  7. If the absolute value of a number is less than decimal 1, the sign of exponent in floating point representation is

  8. A.
    zero
    B.
    negative
    C.
    zero or negative
    D.
    positive

  9. Which of the following is not a library string function in C?

  10. A.
    strlen
    B.
    strcpy
    C.
    strdup
    D.
    strbig

  11. An instruction using immediate addressing mode in 8085 is

  12. A.
    2 bytes long
    B.
    3 bytes long
    C.
    2 or 3 bytes long
    D.
    1 or 2 or 3 bytes long

  13. Consider the following statements about 8085

    1. The instruction LDA uses direct addressing mode.
    2. The instruction MVI uses direct addressing mode.
    3. The instruction MVI uses immediate addressing mode.
    4. The instruction LDA uses immediate addressing mode.
    Which of the above are correct?

  14. A.
    1 and 3 only
    B.
    3 and 4 only
    C.
    1 and 2 only
    D.
    2 only

  15. Consider the directive T : DS105. This directive

  16. A.
    directs the assembler to reserve a sequence of 105 bytes in the memory
    B.
    directs the assembler to reserve a sequence of 105 bits in the memory
    C.
    directs the assembler to reserve a sequence of consecutive 105 bytes in the memory
    D.
    directs the assembler to reserve a sequence of consecutive 105 bits in the memory

  17. Which of the following is not a valid logical expression in Pascal?

  18. A.
    A > = B
    B.
    A < = B
    C.
    A = < B
    D.
    A < > B

  19. Which of the following instructions in 8085 does not belong to data transfer group?

  20. A.
    LDA addr
    B.
    STA addr
    C.
    XCHG
    D.
    SUB r