30
Figure 4C.—Logic circuit.
IN ANSWERING QUESTIONS 4-12
THROUGH 4-14, REFER TO FIGURE 4C.
4-12. What type of circuit is shown in the
figure?
1. Full adder
2. Subtracter adder
3. Double half adder
4. Double exclusive OR
4-13. If A and B are 0 and C is 1, what will be
the outputs at D and E?
1. D = 0, E = 0
2. D = 0, E = 1
3. D = 1, E = 0
4. D = 1, E = 1
4-14. Under which of the following conditions
will outputs D and E both be HIGH?
1. A, B, and C are HIGH
2. A and B are HIGH, C is LOW
3. A and B are LOW, C is HIGH
4. A, B, and C are LOW
4-15. What is the largest sum that can be
obtained from a full adder?
1. 102
2. 112
3. 1002
4.
1112
4-16. How many full adders are required to
form a parallel adder capable of adding
100012 and 10002?
1. Five
2. Six
3. Three
4. Four
