MCQ IN COMPUTER SCIENCE & ENGINEERING

COMPUTER SCIENCE AND ENGINEERING

DIGITAL LOGIC

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
OR gate requires how many “1” inputs to output a “1”?
A
1
B
2
C
0
D
None of the above
Explanation: 

Detailed explanation-1: -OR gate-output is 1 if AT LEAST one input is 1. XOR gate-output is 1 if ONLY one input is 1. NAND gate-output is 1 if AT LEAST one input is 0. NOR gate-output is 1 if BOTH inputs are 0.

Detailed explanation-2: -Like the AND gate, the OR function can hold any number of individual inputs. However, commercially available OR gates are available in 2, 3, or 4 input types.

Detailed explanation-3: -Like the AND gate, the OR function can have any number of individual inputs. However, commercial available OR gates are available in 2, 3, or 4 inputs types. Additional inputs will require gates to be cascaded together for example.

Detailed explanation-4: -When both inputs are equal, either are 1 or both are 0, the output will be logical 0. This is the reason an XOR gate is also called an anti-coincidence gate or inequality detector. This gate is called XOR or exclusive OR gate because its output is only 1 when its input is exclusively 1.

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