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ECE :: Microprocessors

  1. Microprocessor 386SX is a 16/32 bit microprocessor. It has

  2. A.
    16 bit registers and 32 bit data bus
    B.
    16 bit registers and 16 bit data bus
    C.
    32 bit registers and 32 bit data bus
    D.
    32 bit register and 16 bit data bus

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  3. Assertion (A): An instruction cycle consists of fetch and execute cycles.

    Reason (R): Fetch cycle has one machine cycle but execute cycle may have one or more machine cycles depending on length of instruction.

  4. 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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  5. Instruction cycle is the time required to complete the execution of an instruction.

  6. A.
    True
    B.
    False

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  7. The contents of F register in 8085 are 01010001. This means

  8. A.
    S = 0, Z = 1, AC = 1, P = 0 and CY=1
    B.
    S = 1, Z = 1, AC = 1, P = 0 and CY=1
    C.
    S = 1, Z = 0, AC = 1, P = 0 and CY=1
    D.
    S = 1, Z = 0, AC = 0, P = 0 and CY=1

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  9. In a microprocessor

  10. A.
    one machine cycle is equal to one clock cycle
    B.
    one clock cycle consists of several machine cycles
    C.
    one machine cycle consists of several clock cycles
    D.
    one machine cycle is always less than one clock cycle

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  11. Consider the following rules in Fortran

    1. A signed or unsigned real variable name or a real constant is a real expression.
    2. Two real expressions connected by an arithmetic operator is a real expression.
    3. A real variable or constant exponential by an integer constant or integer variable is not valid
    Which of the above are correct?

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

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  13. Machine cycle is always the same as instruction cycle.

  14. A.
    True
    B.
    False

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  15. Which of the following is true?

  16. A.
    During addition if the carry into and carry out of the sign bit do not match then an overflow has occurred
    B.
    During addition if the carry into and carry out of the sign bit don't match then an overflow or underflow has occurred
    C.
    During addition if the carry into and carry out of the sign bit match then an overflow or underflow has occurred
    D.
    During addition if the carry into and carry out of the sign bit match then an overflow has occurred

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  17. Which addressing mode is suitable only for these instructions in which there is only one operand?

  18. A.
    Implicit
    B.
    Register
    C.
    Direct
    D.
    Immediate

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  19. Assertion (A): Microprocesspr 8085 has six 8 bit registers B, C, D, E, H L.

    Reason (R): B - C, D - E, H - L may be combined to form register pairs to hold 16 bits data.

  20. 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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