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  1. A 3 bit binary adder can add

  2. A.
    2 bits
    B.
    2 bits
    C.
    3 bits
    D.
    8 bits

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  3. The logic performed by the high-noise immunity logic circuit shown below is

  4. A.
    OR
    B.
    AND
    C.
    NOR
    D.
    NAND

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  5. An 8156 has A15 connected to its CE input. A14 to A8 are unconnected, and AD7 to AC0 are connected.Ignoring shadows, the port addresses

  6. A.
    80 H
    B.
    85 H
    C.
    82 H, 83 H
    D.
    80 H to 85 H

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  7. In 8085 microprocessor, what is the length of IR (instruction register)?

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

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  9. A sequence detector is required to give a logical output of 1 whenever the sequence 1011 is detected in the incoming pulse stream. Minimum number of flip-flops needed to built the sequence detector is

  10. A.
    4
    B.
    3
    C.
    1
    D.
    2

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  11. The contents of the program counter after the call operation will be

  12. A.
    (30F0)H
    B.
    (40F0)H
    C.
    (50F0)H
    D.
    (60F0)H

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  13. Which is correct with respect to computer memory?

  14. A.
    Only a particular address can have a particular memory
    B.
    Any address can have any memory
    C.
    To read a word from computer memory, it is not necessary to specify a location
    D.
    None of the above

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  15. A 3 bit binary adder should use

  16. A.
    3 full adders
    B.
    2 full adders and 1 half adder
    C.
    1 full adder and 2 half adders
    D.
    3 half adders

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  17. For a depletion type NMOS, Vp = - 4 volts. For VGS = 0, 1D = 16 mA in the pinch off region of VDS. For VGS = - 2, the value of ID in the pinch off region of VDS is given by

  18. A.
    64 mA
    B.
    32 mA
    C.
    16 mA
    D.
    4 mA

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  19. The two outputs of RS flip-flop are

  20. A.
    always low
    B.
    always high
    C.
    either low or high
    D.
    always complementary

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