Exercise: Digital Arithmetic Operations And Circuits

Questions for: Digital Arithmetic Operations And Circuits

Convert each of the signed decimal numbers to an 8-bit signed binary number (two's-complement).
+7        –3        –12
A:
0000  0111    1111  1101    1111  0100
B:
1000  0111    0111  1101    0111  0100
C:
0000  0111    0000  0011    0000  1100
D:
0000  0111    1000  0011    1000  1100
Answer: A
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Which of the following is correct for full adders?
A:
Full adders have the capability of directly adding decimal numbers.
B:
Full adders are used to make half adders.
C:
Full adders are limited to two inputs since there are only two binary digits.
D:
In a parallel full adder, the first stage may be a half adder.
Answer: D
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Perform the following hex subtraction: ACE16 – 99916 =
A:
23516
B:
13516
C:
03516
D:
33516
Answer: B
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Half-adders can be combined to form a full-adder with no additional gates.
A:
True
B:
False
C:
D:
Answer: B
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What distinguishes the look-ahead-carry adder?
A:
It is slower than the ripple-carry adder.
B:
It is easier to implement logically than a full adder.
C:
It is faster than a ripple-carry adder.
D:
It requires advance knowledge of the final answer.
Answer: C
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