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ECE :: Digital Electronics

  1. The boolean expression for shaded area in the given figure is

  2. A.
    AB + AC
    B.
    ABC + ABC
    C.
    ABC + ABC
    D.
    None of these

  3. 100101.10112 = __________ .

  4. A.
    115.228
    B.
    115.548
    C.
    215.548
    D.
    100.018

  5. The given figure shows a K-map for a Boolean function. The number of essential prime implicants is

  6. A.
    4
    B.
    5
    C.
    6
    D.
    8

  7. For the logic circuit given, what is the simplified Boolean function?

  8. A.
    X = AB + C
    B.
    X = BC + A
    C.
    X = AB + AC
    D.
    X = AC + B

  9. An XOR gate with 6 variables is as follows A ⊕ B ⊕ C ⊕ D ⊕ E ⊕ F. The number of minterms in the Boolean expression is

  10. A.
    6
    B.
    12
    C.
    64
    D.
    32

  11. Semiconductor ROM's are sometimes preferred to semiconductor RAM's because

  12. A.
    ROM's are cheaper than RAMs
    B.
    ROMs are faster
    C.
    ROMs do not require power supply for their operations
    D.
    Programs stored in ROMs cannot be altered either by the power failure or by the user

  13. RAMs can be built with bipolar or CMOS transistor RAMs that are not possible with bipolar transistors are

  14. A.
    SRAM
    B.
    SRAM, DRAM
    C.
    DRAM
    D.
    PROM

  15. RS latch can be built with

  16. A.
    NOR gates
    B.
    NAND gates
    C.
    NOR or NAND gates
    D.
    none of the above

  17. In D-type FF, Preset (Pr) and clear (Clr) inputs are called

  18. A.
    Synchronous
    B.
    Asynchronous
    C.
    Data
    D.
    None

  19. Which memory is available in all technologies?

  20. A.
    PROM
    B.
    EEPROM
    C.
    ROM
    D.
    EPROM