Home / ECE / Digital Electronics :: section-25

ECE :: Digital Electronics

  1. The NAND gate is AND gate followed by ___________.

  2. A.

     NOT gate

    B.

     OR gate

    C.

     AND gate

    D.

     None of the above


  3. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

  4. A.

     TTLAS

    B.

     CMOS

    C.

     ECL

    D.

     TTLLS


  5. In Boolean algebra, the bar sign (-) indicates ___________.

  6. A.

     OR operation

    B.

     AND operation

    C.

     NOT operation

    D.

     None of the above


  7. A hexadecimal odometer displays F 52 F. The next reading will be

  8. A.

     F52E

    B.

     G52F

    C.

     F53F

    D.

     F53O


  9. The binary code of (21.125)10 is

  10. A.

     10101.001

    B.

     10100.001

    C.

     10101.010

    D.

     10100.111


  11. A NAND gate is called a universal logic element because

  12. A.

     It is used by everybody

    B.

     Any logic function can be realized by NAND gates alone

    C.

     All the minization techniques are applicable for optimum NAND gate realization

    D.

     Many digital computers use NAND gates.


  13. NAND. gates are preferred over others because these

  14. A.

     have lower fabrication area

    B.

     can be used to make any gate

    C.

     consume least electronic power

    D.

     provide maximum density in a chip.


  15. Which is the correct order of sequence for representing the input values in K-map?

  16. A.

     (00, 01, 10, 11)

    B.

     (00, 10, 01, 11)

    C.

     (00, 01, 11, 10)

    D.

     (00, 10, 11, 01)


  17. The inputs of a NAND gate are connected together. The resulting circuit is ___________.

  18. A.

     OR gate

    B.

     AND gate

    C.

     NOT gate

    D.

     None of the above


  19. Digital computers are more widely used as compared to analog computers, because they are

  20. A.

     Less expensive

    B.

     Always more accurate and faster

    C.

     Useful over wider ranges of problem types

    D.

     Easier to maintain