Digital Electronics-Logic Gates
Digital Electronics-Logic Gates
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 ________.
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