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ECE :: Digital Electronics

  1. A ripple counter has propagation delay.

  2. A.
    True
    B.
    False

  3. Adder is a combinational logic circuit.

  4. A.
    True
    B.
    False

  5. In a decimal digital computer, the number 127 is stored

  6. A.
    1111111
    B.
    0001 00100111
    C.
    10001
    D.
    11000111

  7. In 8085 microprocessor, which of the following interrupts has the lowest priority?

  8. A.
    RST 5.5
    B.
    RST 7.5
    C.
    TRAP
    D.
    INTR

  9. All digital circuits can be realised using only

  10. A.
    EX-OR gates
    B.
    Multiplexers
    C.
    Half adders
    D.
    OR gates

  11. The code used to reduce the error due to ambiguity in reading of a binary optical encoder is

  12. A.
    Octal code
    B.
    Excess-3 code
    C.
    gray code
    D.
    BCD code

  13. In a clocked latch, clock drives

  14. A.
    R NAND gate
    B.
    S NAND gate
    C.
    both R and S NAND gates
    D.
    either R or S NAND gates

  15. Vectored interrupt is an interrupt that takes the program to a vector location. TRAP vectors to 0024 FI, RST 7.5 to 003 CH, RST 6.5 to 0034 H and

  16. A.
    RST 5.5
    B.
    RST 6.5
    C.
    24 H to 48 H
    D.
    RST 5.5 to 002 CH

  17. ALU carries out

  18. A.
    arithmetic operations
    B.
    logic operations
    C.
    both arithmetic and logic operations
    D.
    none of the above

  19. The SID data received is

  20. A.
    LSB first
    B.
    LSB last
    C.
    1
    D.
    none of these