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Logic Gates – 1 – 6

26. A NAND gate has :

(a) LOW inputs and a HIGH output
(b) LOW inputs and a LOW output
(c) HIGH inputs and a HIGH output
(d) None of the these

Answer
Answer : (a)

Explanation
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27. The basic logic gate whose output is the complement of the input is the :

(a) OR gate
(b) AND gate
(c) INVERTER gate
(d) None of these

Answer
Answer : (c)

Explanation
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28. What input values will cause an AND logic gate to produce a HIGH output ?

(a) All inputs are LOW.
(b) At least one input is LOW.
(c) All inputs are HIGH.
(d) At least one input is HIGH.

Answer
Answer : (c)

Explanation
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29. How many NAND circuits are contained in a 7400 NAND IC ?

(a) 1
(b) 2
(c) 3
(d) 4

Answer
Answer : (d)

Explanation
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30. Exclusive-OR (XOR) logic gates can be constructed from what other logic gates ?

(a) OR gates only
(b) OR gates and NOT gates
(c) AND gates and NOT gates
(d) AND gates, OR gates, and NOT gates

Answer
Answer : (d)

Explanation
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