Combinational Circuits – Exercise – 1

46. The carry propagation can be expressed as ________.

(a) Cp = AB
(b) Cp = A + B
(c)
(d)

Answer
Answer : (b)
Explanation
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47. Which gate is best used as a basic comparator?

(a) NOR
(b) OR
(c) Exclusive-OR
(d) AND

Answer
Answer : (c)
Explanation
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48. A half-adder does not have ________.

(a) carry in
(b) carry out
(c) two inputs
(d) all of the above

Answer
Answer : (a)
Explanation
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49. For the device shown here, assume the D input is LOW, both S inputs are LOW, and the input is LOW. What is the status of the outputs?

(a) All are HIGH.
(b) All are LOW.
(c) All but are LOW.
(d) All but are HIGH.

Answer
Answer : (d)
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50. When adding an even parity bit to the code 110010, the result is ________.

(a) 1110010
(b) 1111001
(c) 110010
(d) 001101

Answer
Answer : (a)
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