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ECE :: Digital Electronics

  1. The number of programmable 8 bit registers of 6800 are

  2. A.
    2
    B.
    3
    C.
    4
    D.
    5

  3. The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is

  4. A.
    0010001
    B.
    1110001
    C.
    0110001
    D.
    0011001

  5. When two 4 bit parallel adders are cascaded we get

  6. A.
    4 bit parallel adder
    B.
    8 bit parallel adder
    C.
    16 bit parallel adder
    D.
    none of the above

  7. Consider the following features:

    1. negative operands cannot be used
    2. when immediate operand changes, the program should be reassembled
    3. the program is difficult to read
    4. the size of operand is restricted by word length of the computer
    Disadvantages of immediate addressing include

  8. A.
    1 and 2
    B.
    2 and 4
    C.
    2 and 3
    D.
    1 and 4

  9. Which binary addition is incorrect?

  10. A.
    1101.1 + 1011.1 = 11001.0
    B.
    101101 + 1101101 + 1100011
    C.
    0.0011 + 0.1110 + 1.0001
    D.
    1100.001 + 1011.011 = 10111.100

  11. Flash ADC is

  12. A.
    serial ADC
    B.
    parallel ADC
    C.
    series-parallel ADC
    D.
    successive approximation ADC

  13. Which of the following logic no resistors are used?

  14. A.
    CMOS
    B.
    TTL
    C.
    4 n sec ECL
    D.
    8 sec ECL

  15. PROM is

  16. A.
    Permanent Read Only Memory
    B.
    Polarized Read Only Memory
    C.
    Positive Read Only Memory
    D.
    Programmable Read Only Memory

  17. Decimal 17 in octal system is represented by

  18. A.
    888
    B.
    111
    C.
    21
    D.
    27