Digital Electronics Logic Gates Questions and Answers
Digital Electronics Logic Gates questions with answers form the base of circuit design and digital systems. Students preparing for GATE, DRDO, and BARC exams must understand AND, OR, NOT, NAND, NOR, XOR, and XNOR gate operations. Practicing these electronics MCQs improves problem-solving accuracy in truth tables, Boolean algebra, and logic circuit simplification. These programming-style questions with explanations are ideal for both technical interviews and competitive electronics exams.
Covers types and functions of logic gates. Complement with digital electronics combinational logic circuits and boolean algebra
Digital Electronics Logic Gates
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78 questions
11. The output of a NOR gate is HIGH if ________.
- all inputs are HIGH
- any input is HIGH
- any input is LOW
- all inputs are LOW
12. The switching speed of CMOS is now ________.
- competitive with TTL
- three times that of TTL
- slower than TTL
- twice that of TTL
13. The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
- Boolean constant
- Boolean variable
- truth table
- input logic function
14. The power dissipation, PD, of a logic gate is the product of the ________.
- dc supply voltage and the peak current
- dc supply voltage and the average supply current
- ac supply voltage and the peak current
- ac supply voltage and the average supply current
15. If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
- 1
- 2
- 7
- 8
16. The Boolean expression for a 3-input AND gate is ________.
- X = AB
- X = ABC
- X = A + B + C
- X = AB + C
17. A CMOS IC operating from a 3-volt supply will consume ________.
- less power than a TTL IC
- more power than a TTL IC
- the same power as a TTL IC
- no power at all
18. What does the small bubble on the output of the NAND gate logic symbol mean?
- open collector output
- tristate
- The output is inverted.
- none of the above
19. What are the pin numbers of the outputs of the gates in a 7432 IC?
- 3, 6, 10, and 13
- 1, 4, 10, and 13
- 3, 6, 8, and 11
- 1, 4, 8, and 11
20. The output of a NOT gate is HIGH when ________.
- the input is LOW
- the input is HIGH
- power is applied to the gate's IC
- power is removed from the gate's IC