# Logic Gates – Exercise – 3

101. How many inputs are on the logic gates of a 74HC21 IC?

(a) 1
(b) 2
(c) 3
(d) 4

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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

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103. How many AND gates are found in a 7411 IC?

(a) 1
(b) 2
(c) 3
(d) 4

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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

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105. Which of the following logical operations is represented by the + sign in Boolean algebra?

(a) inversion
(b) AND
(c) OR
(d) complementation

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