The basic logic gate whose output is the complement of the input is the:
Answer: C
Correct answer: inverter
The inverter, or NOT gate, outputs the complement of its single input. AND and OR combine several inputs, and a comparator compares two values.
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When reading a Boolean expression, what does the word "NOT" indicate?
Answer: B
Correct answer: inversion
NOT is the complement operator, written with a prime or an overbar; it turns 1 into 0 and 0 into 1.
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The output of an exclusive-NOR gate is HIGH if ________.
Answer: A
Correct answer: the inputs are equal
XNOR is the complement of XOR, so where XOR detects difference, XNOR detects agreement. It is HIGH when both inputs are 0 and when both are 1.
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How many AND gates are found in a 7411 IC?
Answer: C
Correct answer: 3
The 7411 is a triple three-input AND gate: three gates, each with three inputs, using twelve of the fourteen pins.
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Which of the following equations would accurately describe a four-input OR gate when A = 1, B = 1, C = 0, and D = 0?
Answer: B
Correct answer: 1 + 1 + 0 + 0 = 1
In Boolean algebra the plus sign is OR, not arithmetic addition, and OR gives 1 if any operand is 1. So the sum of several 1s is still 1, and the result is a single bit rather than 01 or 00.
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What is the name of a digital circuit that produces several repetitive digital waveforms?
Answer: C
Correct answer: a Johnson shift counter
A Johnson counter is a shift register whose inverted output is fed back to its input, so it cycles through a fixed sequence of states and each of its stages produces a repetitive waveform, offset in phase from the others. A single gate produces no sequence at all.
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The basic types of programmable arrays are made up of ________.
Answer: D
Correct answer: AND gates and OR gates
Programmable arrays implement sum-of-products expressions, so they consist of an AND plane forming the product terms and an OR plane summing them. Whether one plane, the other, or both are programmable is what distinguishes PROM, PAL and PLA.
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The logic gate that will have HIGH or "1" at its output when any one (or more) of its inputs is HIGH is a(n):
Answer: A
Correct answer: OR gate
OR gives 1 when at least one input is 1, which is the condition described. A NOR gate would give 0 in that case, and an AND gate needs every input HIGH.
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CMOS IC packages are available in ________.
Answer: C
Correct answer: DIP and SOIC configurations
CMOS parts are supplied in both packages: the through-hole dual in-line package and the surface-mount small-outline package, which holds the same circuit in far less board area.
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Which of the following is not a basic Boolean operation?
Answer: D
Correct answer: FOR
The three basic Boolean operations are AND, OR and NOT; every other function can be built from them. FOR is a programming keyword, not a logical operation.
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