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Digital Electronics
‣
Combinational Logic Circuits
Comments
Question
What will a design engineer do after he/she is satisfied that the design will work?
Options
A. Put it in a flow chart
B. Program a chip and test it
C. Give the design to a technician to verify the design
D. Perform a vector test
Correct Answer
Program a chip and test it
Combinational Logic Circuits problems
Search Results
1. What type of logic circuit is represented by the figure shown below?
Options
A. XOR
B. XNOR
C. XAND
D. XNAND
Show Answer
Scratch Pad
Discuss
Correct Answer: XNOR
2. In VHDL, macrofunctions is/are:
Options
A. digital circuits.
B. analog circuits.
C. a set of bit vectors.
D. preprogrammed TTL devices.
Show Answer
Scratch Pad
Discuss
Correct Answer: preprogrammed TTL devices.
3. Which of the following is an important feature of the sum-of-products form of expressions?
Options
A. All logic circuits are reduced to nothing more than simple AND and OR operations.
B. The delay times are greatly reduced over other forms.
C. No signal must pass through more than two gates, not including inverters.
D. The maximum number of gates that any signal must pass through is reduced by a factor of two.
Show Answer
Scratch Pad
Discuss
Correct Answer: All logic circuits are reduced to nothing more than simple AND and OR operations.
4. Looping on a K-map always results in the elimination of:
Options
A. variables within the loop that appear only in their complemented form.
B. variables that remain unchanged within the loop.
C. variables within the loop that appear in both complemented and uncomplemented form.
D. variables within the loop that appear only in their uncomplemented form.
Show Answer
Scratch Pad
Discuss
Correct Answer: variables within the loop that appear in both complemented and uncomplemented form.
5. How many outputs would two 8-line-to-3-line encoders, expanded to a 16-line-to-4-line encoder, have?
Options
A. 3
B. 4
C. 5
D. 6
Show Answer
Scratch Pad
Discuss
Correct Answer: 4
6. Convert BCD 0001 0010 0110 to binary.
Options
A. 1111110
B. 1111101
C. 1111000
D. 1111111
Show Answer
Scratch Pad
Discuss
Correct Answer: 1111110
7. How many data select lines are required for selecting eight inputs?
Options
A. 1
B. 2
C. 3
D. 4
Show Answer
Scratch Pad
Discuss
Correct Answer: 3
8. For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the
input is HIGH. What is the status of the
outputs?
Options
A. All are HIGH.
B. All are LOW.
C. All but
are LOW.
D. All but
are HIGH.
Show Answer
Scratch Pad
Discuss
Correct Answer: All are HIGH.
9. How many 4-bit parallel adders would be required to add two binary numbers each representing decimal numbers up through 300
10
?
Options
A. 1
B. 2
C. 3
D. 4
Show Answer
Scratch Pad
Discuss
Correct Answer: 3
10. Solve the network in the figure given below for
X
.
Options
A.
A
+
BC
+
D
B. ((
A
+
B
)
C
) +
D
C.
D
(
A
+
B
+
C
)
D. (
AC
+
BC
)
D
Show Answer
Scratch Pad
Discuss
Correct Answer: ((
A
+
B
)
C
) +
D
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