A waveform can be enabled or disabled by both AND and OR gates.
Answer: A
Correct answer: True
Either gate can gate a waveform, depending on the level held on the control input: an AND passes the signal when its other input is HIGH and blocks it at 0 when LOW, and an OR passes it when its other input is LOW and blocks it at 1 when HIGH.
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An exclusive-OR gate output is HIGH when the inputs are unequal.
Answer: A
Correct answer: True
XOR is the inequality detector: its output is HIGH exactly when its two inputs differ.
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In a Boolean equation the use of the + symbol represents the OR function.
Answer: A
Correct answer: True
In Boolean algebra the plus sign denotes OR. It is not arithmetic addition, which is why \( 1+1=1 \) rather than 2.
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A logic gate has one or more output terminals and one input terminal.
Answer: B
Correct answer: False
The statement is inverted. A logic gate has one or more inputs and a single output.
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A logic pulser is used to determine the level of floating in a circuit.
Answer: B
Correct answer: False
A logic pulser injects a pulse into a node to stimulate the circuit. It is the logic probe that reads the level and shows whether a node is HIGH, LOW or floating.
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An inverter output is the complement of its input.
Answer: A
Correct answer: True
An inverter produces the complement of its input by definition: HIGH becomes LOW and LOW becomes HIGH.
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It is important to memorize logic symbols, Boolean equations, and truth tables for logic gates.
Answer: A
Correct answer: True
The symbol, the Boolean expression and the truth table are three views of the same gate, and reading a circuit means moving between them without hesitation, which is why they are worth knowing by heart.
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If A is LOW or B is LOW or BOTH are LOW, then X is LOW. If A is HIGH and B is HIGH, then X is HIGH. These rules specify the operation of a(n) ________.
Answer: A
Correct answer: AND gate
The rules describe an output that is HIGH only when both inputs are HIGH and LOW in every other case, which is the AND function. An OR gate would be HIGH whenever either input was HIGH.
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A major advantage of ECL logic over TTL and CMOS is ________.
Answer: B
Correct answer: high speed
ECL keeps its transistors out of saturation, so they switch very fast; the price is a large standing current and therefore high power dissipation. Speed is what it is chosen for, and power is what it costs.
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The output of an XOR gate is HIGH only when ________.
Answer: C
Correct answer: the two inputs are unequal
XOR gives 1 when its inputs differ and 0 when they agree, so equal inputs - both 0 or both 1 - produce a LOW output.
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