22
3-25. Which of the following is the standard
logic symbol for a NAND gate?
3-26. What is the output expression for an
inverter with the following input?
(R Q ) + ( S T)
1. (
Q
R
) + (S T )
2. R Q S T
3.
RQST
4.
T)
S
(
)
Q
(R
+
3-27. Which of the following gates produces a
HIGH output when any or all of the
inputs are LOW?
1. AND
2. OR
3. NAND
4. NOR
Figure 3D. Incomplete NAND gate Truth Table.
IN ANSWERING QUESTION 3-28, REFER
TO FIGURE 3D.
3-28. Which of the following NAND gate input
combinations and output function is
missing?
1. X = 0, Y = 1, f = 0
2. X = 0, Y = 1, f = 1
3. X = 0, Y = 0, f = 0
4. X = 1, Y = 1, f = 1
3-29. What is the output Boolean expression for
a NAND gate with inputs G, K, and P ?
1.
GK P
2.
GKP
3.
P
GK
4.
G K P
