Digital Electronics(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. "What would happen, if smaller logic modules are utilized for performing logical functions associated with FPGA?
A. Propagation delay will increase
B. FPGA area will increase
C. Wastage of logic modules will not be prevented
D. Number of interconnected paths in device will decrease"
  1.    A & B
  2.    C & D
  3.    A & D
  4.    B & C
Explanation:-
Answer: Option A. -> A & B
Question 7. What is/are the configurable functions of each and every IOBs connected around the FPGA device from the operational point of view?
  1.    Input operation
  2.    Tristate output operation
  3.    Bi-directional I/O pin access
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 8. A debouncing circuit is
  1.    An astable MV
  2.    A bistable MV
  3.    A latch
  4.    A monostable MV
Explanation:-
Answer: Option C. -> A latch
Question 9. Most of the digital computers do not have floating point hardware because
  1.    Floating point hardware is costly
  2.    It is slower than software
  3.    It is not possible to perform floating point addition by hardware
  4.    Of no specific reason
Explanation:-
Answer: Option A. -> Floating point hardware is costly
Question 10. The inverter is ___________
  1.    NOT gate
  2.    OR gate
  3.    AND gate
  4.    None of the above
Explanation:-
Answer: Option A. -> NOT gate
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