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ECE :: Microprocessors

  1. In which of the following 8085 instructions is the 8 bit number in accumulator adjusted to form two four bit BCD numbers

  2. A.
    DAD rp
    B.
    DAA
    C.
    DCX rp
    D.
    ADC M

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  3. In 8085 the address space size is

  4. A.
    64 kbits
    B.
    64 k bytes
    C.
    32 kbits
    D.
    16 k bytes

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  5. In 8085 the instruction MOV A, B is an example of

  6. A.
    Direct addressing
    B.
    Immediate addressing
    C.
    Register addressing
    D.
    Register indirect addressing

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  7. Pagemaker is an application software for DTP.

  8. A.
    True
    B.
    False

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  9. Assertion (A): Logical group of instructions contains instructions for logic operations.

    Reason (R): Data transfer group instruction is basically a copying instruction.

  10. 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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  11. Assertion (A): C allows the use of logical operators, AND, OR, NOT.

    Reason (R): C has logical operators as well as bitwise operators like AND, OR etc.

  12. 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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  13. The read and write cycle times of cache memory are in the range of

  14. A.
    1 - 3 ns
    B.
    25 ns - 45 ns
    C.
    200 ns - 300 ns
    D.
    1 μs

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  15. In 8086

  16. A.
    the registers SI and DI are used for string operation
    B.
    the registers CS and DS are used for string operation
    C.
    the registers SS and ES are used for string operation
    D.
    the registers SI and SP are used for string operation

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  17. In which of the following logical group instructions of 8085 do the contents of accumulator remain unchanged?

  18. A.
    ORA r
    B.
    ORA M
    C.
    ORI data
    D.
    CMP r

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  19. If quadratic equation x2 - 1000x + 25 = 0 is solved using floating point arithmetic with 4 digit mantissa, the roots are

  20. A.
    .1000 E 4 and .1000 E 4 respectively
    B.
    .0000 E 4 and .0000 E 4 respectively
    C.
    .1000 E 4 and .0000 E 4 respectively
    D.
    None of the above

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