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Figure 4B.—Logic circuit.
IN ANSWERING QUESTIONS 4-7
THROUGH 4-9, REFER TO FIGURE 4B.
4-7. Which of the following circuits is shown
in the figure?
1. Quarter adder
2. Half adder
3. Full adder
4. Subtracter
4-8. Which of the following gate
combinations may be replaced with an
exclusive OR gate?
1. 1, 2, and 3
2. 1, 2, and 4
3. 1, 3, and 4
4. 2, 3, and 4
4-9. The output of gate 3 is the (a) and the
output of gate 4 is the (b).
1. (a) Carry
(b) sum
2. (a) Sum
(b) difference
3. (a) Sum
(b) carry
4. (a) Carry
(b) difference
4-10. What is the largest sum that can be
obtained from a half adder?
1. 012
2. 102
3. 112
4.
1002
4-11. Which of the following statements
describes the difference between a half
adder and a full adder?
1. A half adder produces a carry
2. A full adder produces a carry
3. A half adder will add a carry from
another circuit
4. A full adder will add a carry from
another circuit
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