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Digital Electronics - Combinational Logic Circuits

Exercise : Combinational Logic Circuits - General Questions
21.
In VHDL, macrofunctions is/are:
digital circuits.
analog circuits.
a set of bit vectors.
preprogrammed TTL devices.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Which of the following expressions is in the product-of-sums form?
(A + B)(C + D)
(AB)(CD)
AB(CD)
AB + CD
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Which of the following is an important feature of the sum-of-products form of expressions?
All logic circuits are reduced to nothing more than simple AND and OR operations.
The delay times are greatly reduced over other forms.
No signal must pass through more than two gates, not including inverters.
The maximum number of gates that any signal must pass through is reduced by a factor of two.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.

For the device shown here, assume the D input is LOW, both S inputs are LOW, and the input is LOW. What is the status of the outputs?

All are HIGH.
All are LOW.
All but are LOW.
All but are HIGH.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?
Current tracer
Logic probe
Oscilloscope
Logic analyzer
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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