Page 90 - Computer science 868 Class 12
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11.  Draw the truth table and the logic circuit diagram, of a Hexadecimal to Binary Encoder.
                Ans.
                     Hexadecimal   B 3     B 2    B 1    B 0
                       number                                  0
                          0         0      0      0      0     1
                          1         0      0      0      1     2
                          2         0      0      1      0     3
                          3         0      0      1      1     4
                                                               5
                          4         0      1      0      0     6
                          5         0      1      0      1     7
                          6         0      1      1      0     8
                          7         0      1      1      1     9
                          8         1      0      0      0     A
                          9         1      0      0      1     B
                          A         1      0      1      0     C
                          B         1      0      1      1     D
                                                               E
                          C         1      1      0      0     F
                          D         1      1      0      1
                          E         1      1      1      0
                          F         1      1      1      1
                                                                          B 3         B 2          B 1         B 0
                   Unsolved Questions




              A.  Tick ( ) the correct option:
                  1.  Complement of the XOR gate is ………………… .
                    a.  NOR                                         b.  OR
                    c.  XNOR                                        d.  AND
                  2.  NAND gate is formed by the combinations of ………………… .
                    a.  AND gate and OR gate                        b.  OR gate and NOT gate
                    c.  NAND gate and NOT gate                      d.  AND gate and NOT gate
                      3.  Which one of the following symbols represents XOR operation?
                    a.  +                                           b.  ⊕
                    c.   ∧                                          d.  ∨
                  4.  ………………… is a negated AND gate.
                    a.  NAND                                        b.  NOR
                    c.  XOR                                         d.  XNOR
                  5.  ………………… gate is used to implement the Encoder circuit.
                    a.  AND                                         b.  OR
                    c.  NOT                                         d.  NAND
                  6.  The following symbol represents the XNOR operation.
                    a.  ∨                                           b.  ∧
                    c.  ⊕                                           d.  9
                  7.  Sum term of a Full adder is equivalent to ………………… .
                    a.  3 variable XNOR gate                        b.  3 variable XOR gate
                    c.  3 variable NAND gate                        d.  3 variable NOR gate

                  8.  ………………… is used in TV remote control.
                    a.  Encoder                                     b.  Decoder
                    c.  Full adder                                  d.  Multiplexer



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