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ECE :: Digital Electronics

  1. A gate in which shift register is connected as shown in the figure below. How many clock pulse (after reset to '0') the contents of the shift register are '000' again?

  2. A.
    3
    B.
    6
    C.
    16
    D.
    8

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  3. Out of SR and JK flip flops, which is susceptible to race condition?

  4. A.
    SR
    B.
    JK
    C.
    Both SR and JK
    D.
    None of the above

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  5. Which liquid crystal is used for LCD display?

  6. A.
    Mercury
    B.
    Pneumatic fluid
    C.
    Aqua regia
    D.
    Liquid boron

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  7. If interrupt service request have been received from all of the following interrupts, then which one will be serviced last?

  8. A.
    RST 5.5
    B.
    RST 6.5
    C.
    RST 7.5
    D.
    None of these

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  9. In order to enable TRAP interrupt, which of the following instructions are needed?

  10. A.
    El only
    B.
    SIM only
    C.
    El and SIM both
    D.
    None

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  11. If modulus is less than 2N, some states of the counter are skipped by using NAND gates.

  12. A.
    True
    B.
    False

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  13. Two 16 : 1 and one 2 : 1 multiplexers can be connected to form a

  14. A.
    16 : 1 multiplexer
    B.
    32 : 1 multiplexer
    C.
    64 : 1 multiplexer
    D.
    8 : 1 multiplexer

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  15. What are the contents of the accumulator after the RIC has been executed?

  16. A.
    40 H
    B.
    41 H
    C.
    42 H
    D.
    43 D

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  17. Assertion (A): In a magnitude comparator IC the cascading inputs provide a means to cascade the 4 bit comparators

    Reason (R): A magnitude comparator has three outputs, A = B, A > B and A < B

  18. 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 true, R is false
    D.
    A is false, R is true

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  19. For the K map of the given figure the simplified Boolean expression is

  20. A.
    AC + A B
    B.
    A BC + A B C + A B C + AB C
    C.
    AC + A B + AC
    D.
    A C + A B + AB

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