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Digital Components - Computer Science and Engineering Objective Questions and Answers

(6) Which of the following is not a universal building block ?
[A] 2 input NAND gate
[B] L3 input NAND gate
[C] 2 input XOR gate
[D] None of the above

Comment

Answer: Option [C]
(7) CARRY, in half adder, can be obtained using
[A] EX-OR gate
[B] AND gate
[C] OR-gate
[D] EX-NOR gate

Comment

Answer: Option [B]

Half adder is constructed using AND operation.

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(8) A NAND gate has inputs A and B. It's output is connected to the both of the inputs of another NAND gate. An equivalent gate for these two NAND gates is
[A] OR gate
[B] AND gate
[C] NOR gate
[D] XOR gate

Comment

Answer: Option [B]
(9) The operation which commutative but not associative is
[A] AND
[B] OR
[C] XOR
[D] NAND

Comment

Answer: Option [D]
(10) In which of the following gates, the output is 1 if and only if at least one input is 1?
[A] OR
[B] NOR
[C] AND
[D] NAND

Comment

Answer: Option [A]

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