GeneralG7B03
Which of the following describes the function of a two-input AND gate?
B
Answer
Practical circuits
Type
A
Output is high when either or both inputs are low
B
Output is high only when both inputs are high
C
Output is low when either or both inputs are high
D
Output is low only when both inputs are high
Answer Notes
In digital logic, an AND gate performs logical multiplication. Its output is driven to a 'high' logic state (often represented by a positive voltage like 5V or a binary 1) if and only if all of its inputs are also in a 'high' state. If any input is 'low', the output immediately goes 'low'.
The name itself is the best mnemonic: Input 1 AND Input 2 must be high for the output to be high. The distractors describe other common logic gates. For example, an OR gate has a high output when either input is high, and a NAND gate has a low output only when both inputs are high.
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Which of these classes of amplifiers has the highest efficiency?
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In a Class A amplifier, what percentage of the time does the amplifying device conduct?