Digital Electronics(Engineering > Electrical Engineering ) Questions and Answers

Question 1. The fan put of a 7400 NAND gate is
  1.    2TTL
  2.    5TTL
  3.    8TTL
  4.    10TTL
Explanation:-
Answer: Option D. -> 10TTL
Question 2. The universal gate is ___________
  1.    NAND gate
  2.    OR gate
  3.    AND gate
  4.    None of the above
Explanation:-
Answer: Option A. -> NAND gate
Question 3. An OR gate has 6 inputs. The number of input words in its truth table are
  1.    6
  2.    32
  3.    64
  4.    128
Explanation:-
Answer: Option C. -> 64
Question 4. In case of OR gate, no matter what the number of inputs, a
  1.    1 at any input causes the output to be at logic 1
  2.    1 at any input causes the output to be at logic 0
  3.    0 any input causes the output to be at logic 0
  4.    0 at any input causes the output to be at logic 1.
Explanation:-
Answer: Option A. -> 1 at any input causes the output to be at logic 1
Question 5. In which of the following base systems is 123 not a valid number?
  1.    Base 10
  2.    Base 16
  3.    Base 8
  4.    Base 3
Explanation:-
Answer: Option D. -> Base 3
Question 6. The number of Boolean functions that can be generated by n variables is equal to
  1.    2n
  2.    22n
  3.    2n-1
  4.    2n
Explanation:-
Answer: Option B. -> 22n
Question 7. Which mechanism allocates the binary value to the states in order to reduce the cost of the combinational circuits?
  1.    State Reduction
  2.    State Minimization
  3.    State Assignment
  4.    State Evaluation
Explanation:-
Answer: Option C. -> State Assignment
Question 8. Positive logic in a logic circuit is one in which
  1.    logic 0 and 1 are represented by 0 and positive voltage respectively
  2.    logic 0 and, -1 are represented by negative and positive voltages respectively
  3.    logic 0 voltage level is higher than logic 1 voltage level
  4.    logic 0 voltage level is lower than logic 1 voltage level.
Explanation:-
Answer: Option D. -> logic 0 voltage level is lower than logic 1 voltage level.
Question 9. Digital circuit can be made by the repeated use of ___________
  1.    OR gates
  2.    NOT gates
  3.    NAND gates
  4.    None of the above
Explanation:-
Answer: Option C. -> NAND gates
Question 10. Pick out the CORRECT statement:
  1.    In a positional number system, each symbol represents the same value irrespective of its position
  2.    The highest symbol in a position number system as a value equal to the number of symbols in the system
  3.    It is not always possible to find the exact binary
  4.    Each hexadecimal digit can be represented as a sequence of three binary symbols.
Explanation:-
Answer: Option C. -> It is not always possible to find the exact binary
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