As a rule, CMOS has the lowest power consumption of all IC families.
Answer: A
Correct answer: True
CMOS draws current essentially only while switching, so its static power dissipation is negligible - far lower than TTL or ECL, which draw current continuously.
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A popular waveform generator is the Johnson shift counter.
Answer: A
Correct answer: True
A Johnson counter is a shift register with inverted feedback, and its stages produce a set of repetitive waveforms offset in phase, which is what makes it a standard waveform generator.
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Good troubleshooting is done by looking at the input signal and how it interacts with the circuits.
Answer: B
Correct answer: False
Troubleshooting works from the output backwards: the output tells you whether the circuit is doing what it should, and the inputs are then checked to find why not. Watching the input alone shows nothing about the fault.
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A NOR gate and an OR gate operate in exactly the same way.
Answer: B
Correct answer: False
NOR is the complement of OR, so the two produce opposite outputs for every input combination - the opposite of operating in the same way.
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An OR array is programmed by blowing fuses to eliminate selected variables from the output functions.
Answer: A
Correct answer: True
In a programmable OR array each product term reaches the output through a fuse, and blowing a fuse removes that term from the function, leaving only the terms wanted.
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A NAND gate output is LOW only if all the inputs are HIGH.
Answer: A
Correct answer: True
NAND is the complement of AND, and AND is 1 only when every input is 1. So the NAND output is LOW in exactly that one case.
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An AND gate output is LOW if all the inputs are HIGH.
Answer: B
Correct answer: False
AND gives 1 when all inputs are HIGH, so its output in that case is HIGH, not LOW. It is NAND that goes LOW there.
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Power is connected to pins 7 and 14 of a 7408 quad two-input AND gate IC to allow voltage for all four AND gates on the IC.
Answer: B
Correct answer: True
The 7408, like the rest of the 14-pin family, takes VCC on pin 14 and ground on pin 7, and that single supply serves all four gates in the package.
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An exclusive-NOR gate output is HIGH when the inputs are unequal.
Answer: B
Correct answer: False
XNOR is HIGH when its inputs are equal. It is XOR whose output is HIGH when they are unequal.
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An OR gate output is HIGH only if all the inputs are HIGH.
Answer: B
Correct answer: False
An OR output is HIGH if any input is HIGH. Requiring all of them is the AND condition.
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