# 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

• Logic Gates » Exercise - 2 51. Which type of gate can be used to add two bits? (a) Ex-OR (b) Ex-NOR (c) Ex-NAND (d) NOR 52. Show from the truth table how an exclusive-OR gate can be used to invert the data on one input if the other input is a special control function. (a) Using A as the control, when A = 0, X is the same as B. When A = 1, X is the same as B. (b) Using A as the control, when A = 0, X is the same as B. When A = 1, X is the inverse of B. (c) Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the same as B. (d) Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the inverse of B. 53. Parity systems are defined as either________ or ________ and will add an extra ________ to the digital information being transmitted. (a) positive, negative, byte (b) odd, even, bit (c) upper, lower, digit (d) on, off, decimal 54. The Ex-NOR is sometimes called…
• 101. How many inputs are on the logic gates of a 74HC21 IC? (a) 1 (b) 2 (c) 3 (d) 4 102. What are the pin numbers of the outputs of the gates in a 7432 IC? (a) 3, 6, 10, and 13 (b) 1, 4, 10, and 13 (c) 3, 6, 8, and 11 (d) 1, 4, 8, and 11 103. How many AND gates are found in a 7411 IC? (a) 1 (b) 2 (c) 3 (d) 4 104. Which of the following equations would accurately describe a four-input OR gate when A = 1, B = 1, C = 0, and D = 0? (a) 1 + 1 + 0 + 0 = 01 (b) 1 + 1 + 0 + 0 = 1 (c) 1 + 1 + 0 + 0 = 0 (d) 1 + 1 + 0 + 0 = 00 105. Which of the following logical operations is represented by the + sign in Boolean algebra? (a) inversion (b) AND (c) OR (d) complementation 106. The logic gate that will have HIGH or "1" at its output when any one (or more) of its inputs is HIGH is a(n): (a) OR gate (b)…