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ECE :: Digital Electronics

  1. Which of the following shows the equivalence of DeMorgan's first theorem
  2. A.
    OR gate and Exclusive OR gate
    B.
    NOR gate and Bubbled AND gate
    C.
    NOR gate and NAND gate
    D.
    NAND gate and NOT gate

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  3. Which of the following Signed Binary Number is equal to -8
  4. A.
    10001000
    B.
    00001000
    C.
    10000000
    D.
    11000000

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  5. Which of the memory is known as a volatile memory
  6. A.
    ROM
    B.
    RAM
    C.
    PROM
    D.
    EEPROM

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  7. If the input to T-flipflop is 100 Hz signal, the final output of the three T- flipflops in cascade is
  8. A.
    1000 Hz
    B.
    500 Hz
    C.
    333Hz
    D.
    12.5Hz

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  9. For which of the following code all successive numbers differ from their preceding number by a single bit
  10. A.
    Binary code
    B.
    BCD
    C.
    Excess "“ 3
    D.
    Gray

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  11. Which of the following gates are required to build a half adder
  12. A.
    EX-OR gate and NOR gate
    B.
    EX-OR gate and OR gate
    C.
    EX-OR gate and AND gate
    D.
    Four NAND gates.

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  13. Which of the following is the simplified Boolean algebra version of (x+y)(x+z)
  14. A.
    X
    B.
    x + x(y + z)
    C.
    x(1 + yz)
    D.
    x + yz

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  15. The 2's complement of the number 1101101 is
  16. A.
    0101110
    B.
    0111110
    C.
    0110010
    D.
    0010011

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  17. For which of the following the speed of conversion is maximum
  18. A.
    Successive-approximation A/D converter
    B.
    Parallel-comparative A/D converter
    C.
    Counter ramp A/D converter
    D.
    Dual-slope A/D converter

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  19. By using ________, The data can be changed from special code to temporal code
  20. A.
    Shift registers
    B.
    Counters
    C.
    Combinational circuits
    D.
    A/D converters

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