# Logic Gates – Exercise – 4

156. Assume you have A, B, C, and D available but not their complements. The minimum number of 2-input NAND gates required to implement the equation is ________.

(a) 3
(b) 4
(c) 5
(d) 6

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157. A gate can drive a number of load gate inputs up to its specified ________.

(a) supply voltage
(b) noise margin
(c) fan-in
(d) fan-out

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158. If both inputs of a 2-input NOR gate are connected, the gate will function as an ________.

(a) OR gate
(b) AND gate
(c) inverter
(d) any of the above

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159. Using the universal property of a NAND gate, one or more NAND gates can be used to replace an ________.

(a) OR gate
(b) AND gate
(c) inverter
(d) any of the above

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160. The expression can be directly implemented using only ________.

(a) an XOR gate
(b) an XNOR gate
(c) an AOI circuit
(d) three 2-input NAND gates

Explanation
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