26. Which output expression might indicate a product-of-sums circuit construction?
(a)
(b)
(c)
(d)
27. The NAND or NOR gates are referred to as “universal” gates because either:
(a) can be found in almost all digital circuits
(b) can be used to build all the other types of gates
(c) are used in all countries of the world
(d) were the first gates to be integrated
28. One of De Morgan’s theorems states that . Simply stated, this means that logically there is no difference between:
(a) a NOR and an AND gate with inverted inputs
(b) a NAND and an OR gate with inverted inputs
(c) an AND and a NOR gate with inverted inputs
(d) a NOR and a NAND gate with inverted inputs
29. When are the inputs to a NAND gate, according to De Morgan’s theorem, the output expression could be:
(a) X = A + B
(b)
(c) X = (A)(B)
(d)
30. An AND gate with schematic “bubbles” on its inputs performs the same function as a(n)________ gate.
(a) NOT
(b) OR
(c) NOR
(d) NAND
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