Home / ECE / Digital Electronics :: section-25

ECE :: Digital Electronics

  1. The fan put of a 7400 NAND gate is

  2. A.

     2TTL

    B.

     5TTL

    C.

     8TTL

    D.

     10TTL

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. The universal gate is ___________

  4. A.

     NAND gate

    B.

     OR gate

    C.

     AND gate

    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. An OR gate has 6 inputs. The number of input words in its truth table are

  6. A.

     6

    B.

     32

    C.

     64

    D.

     128

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. In which of the following base systems is 123 not a valid number?

  8. A.

     Base 10

    B.

     Base 16

    C.

     Base 8

    D.

     Base 3

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. In case of OR gate, no matter what the number of inputs, a

  10. A.

     1 at any input causes the output to be at logic 1

    B.

     1 at any input causes the output to be at logic 0

    C.

     0 any input causes the output to be at logic 0

    D.

     0 at any input causes the output to be at logic 1.

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The number of Boolean functions that can be generated by n variables is equal to

  12. A.

     2n

    B.

     22n

    C.

     2n-1

    D.

     2n

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Which mechanism allocates the binary value to the states in order to reduce the cost of the combinational circuits?

  14. A.

     State Reduction

    B.

     State Minimization

    C.

     State Assignment

    D.

     State Evaluation

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. Positive logic in a logic circuit is one in which

  16. A.

     logic 0 and 1 are represented by 0 and positive voltage respectively

    B.

     logic 0 and, -1 are represented by negative and positive voltages respectively

    C.

     logic 0 voltage level is higher than logic 1 voltage level

    D.

     logic 0 voltage level is lower than logic 1 voltage level.

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Digital circuit can be made by the repeated use of ___________

  18. A.

     OR gates

    B.

     NOT gates

    C.

     NAND gates

    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Pick out the CORRECT statement:

  20. A.

     In a positional number system, each symbol represents the same value irrespective of its position

    B.

     The highest symbol in a position number system as a value equal to the number of symbols in the system

    C.

     It is not always possible to find the exact binary

    D.

     Each hexadecimal digit can be represented as a sequence of three binary symbols.

    View Answer

    Workspace

    Discuss Discuss in Forum