# Logic Gates – Exercise – 2

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

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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.

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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

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54. The Ex-NOR is sometimes called the ________.

(a) parity gate
(b) equality gate
(c) inverted OR
(d) parity gate or the equality gate

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55. If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

(a) 1
(b) 2
(c) 7
(d) 8

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