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ECE :: Microprocessors

  1. Which one is true for writing array variable in Pascal?

  2. A.
    The general form of an array variable is an integer or a real variable name followed by subscripts enclosed within square brackets. The subscripts are separated by commas
    B.
    The general form of an array variable must be an integer name followed by subscripts enclosed within square brackets. The subscripts are separated by commas
    C.
    The subscripts in array variable must be separated by dots
    D.
    The subscripts must be enclosed within parenthesis

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  3. In 8085, which of the following is an 8 bit register?

  4. A.
    A
    B.
    SP
    C.
    PC
    D.
    both (a) and (b)

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  5. What does the instruction 'PCHL' in 8085 do?

  6. A.
    Load the program counter with contents of register pair H L
    B.
    Double the contents of register pair H L
    C.
    Shift the contents of register pair H L by one bit to the right
    D.
    Shift the contents of register pair H L by one bit to left

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  7. In a multi-processor configuration two coprocessors are connected to host 8086 processor. The instruction sets of the two coprocessors

  8. A.
    must be same
    B.
    may overlap
    C.
    must be disjoint
    D.
    must be the same as that of host

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  9. Virus is a

  10. A.
    computer hardware problem
    B.
    an operating system
    C.
    a computer program
    D.
    a computer language

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  11. For converting a decimal number into octal number, the decimal number is expressed as a series of the type

  12. A.
    B.
    C.
    D.
    None of the above

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  13. Consider the following statements

    1. The sign of a floating point number depends on the sign of mantissa only.
    2. If the absolute value of a number is less than 1, the sign of exponent is zero or positive.
    3. With sign bit of mantissa as 0, increasing the exponent from a positive to a more positive value gives a larger floating point number.
    Which of the above are correct?

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

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  15. Assertion (A): In microprocessor 8085 instruction LXIB, 90 FF H means register B and C are loaded with upper and lower bytes to get B = 90 H and C = FFH.

    Reason (R): In 8085 the stack pointer indicates which memory location is to accessed.

  16. 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

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  17. To add 8 bit words, two IC 74181 can be cascaded.

  18. A.
    True
    B.
    False

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  19. The initial contents of ACC and CY in 8085 are

    1. CY = 1
    2. ACC = 10000001
    After instruction RAL is executed once the contents of CY and ACC respectively will be

  20. A.
    1 and 00000011
    B.
    0 and 00000011
    C.
    1 and 00000001
    D.
    0 and 00000001

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