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Digital Electronics
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Describing Logic Circuits
See What Others Are Saying!
Question
In VHDL, local signals are declared in the VARIABLE section, which is placed between the SUBDESIGN section and the logic section.
Options
A. True
B. False
Correct Answer
False
More questions
1. The word size is defined as the number of bits in the binary word that a digital system operates on.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
2. A Karnaugh map is similar to a truth table.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
3. An octal-to-binary encoder has eight data inputs and encodes an output of ________ bits.
Options
A. two
B. three
C. four
D. five
Show Answer
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Discuss
Correct Answer: three
4. In the OLMC of a GAL16V8, the FMUX selects the signal that is fed into the input matrix.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
5. An example of a unidirectional bus in a microcomputer system is the ________.
Options
A. address bus
B. data bus
C. control bus
D. all of the above
Show Answer
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Discuss
Correct Answer: address bus
6. What type of logic circuit is shown below and what logic function is being performed?
Options
A. It is an NMOS AND gate.
B. It is a CMOS AND gate.
C. It is a CMOS NOR gate.
D. It is a PMOS NAND gate.
Show Answer
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Correct Answer: It is a CMOS NOR gate.
7. An inverter output is the complement of its input.
Options
A. True
B. False
Show Answer
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Correct Answer: True
8. A half-adder does not have ________.
Options
A. carry in
B. carry out
C. two inputs
D. all of the above
Show Answer
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Discuss
Correct Answer: carry in
9. The AD7524, a CMOS IC available from several IC manufacturers, is an eight-bit D/A converter that uses a(n) ________.
Options
A. sample-and-hold circuit
B.
R
/2
R
ladder network
C. multiplexer
D. 10 µs clock
Show Answer
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Discuss
Correct Answer:
R
/2
R
ladder network
10. A binary number can be converted to be viewed on a 7-segment display by a(n) ________.
Options
A. decoder
B. encoder
C. multiplexer
D. magnitude comparator
Show Answer
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Discuss
Correct Answer: decoder
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