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NFPA CFPS Exam - Topic 4 Question 16 Discussion

Posted by Gwenn on Nov 22, 2025 at 12:36 PM

What temperature measurement device consists of a pair of wires of different metals or alloys welded together at a point to form a junction to compare the voltage magnitude compared with a compensating junction at 0C and the voltage difference calibrated to give the temperature in degrees?

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30 comments · newest first
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Veronica 6 months ago
Definitely C. The voltage comparison is a big hint.
RU
Rutha 6 months ago
I remember learning about thermocouples in class. They’re reliable!
FA
Fallon 6 months ago
I was torn between B and C, but C makes more sense.
KA
Kaycee 7 months ago
I feel confident about this one. The junction detail is key.
AR
Aretha 7 months ago
Agreed! Thermocouples are widely used for temperature measurement.
AL
Allene 7 months ago
I think it's C) Thermocouple. It fits the description perfectly.
TR
Trevor 8 months ago
Totally agree, thermocouples are super accurate!
CR
Cristal 8 months ago
Surprised it's not more complicated than that!
EU
Eulah 8 months ago
Wait, isn't that a pyrometer?
ZI
Zita 8 months ago
I thought it was a bimetallic thermometer.
FI
Fidelia 8 months ago
Haha, who needs a fancy Thermocouple when you can just stick your hand in the fire and feel the temperature? Just kidding, Thermocouple is the way to go.
BO
Bobbie 8 months ago
Thermocouple, definitely. I remember learning about that in my physics class. Sounds like the most accurate option.
NE
Nelida 9 months ago
I keep mixing up thermocouples and pyrometers. I think thermocouples are the right choice here, but I need to double-check my notes.
NI
Niesha 9 months ago
I practiced a similar question on temperature sensors, and I think thermocouples were mentioned as the ones that use voltage differences.
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Bernardo 9 months ago
I'm not entirely sure, but I feel like the answer might be bimetallic thermometers. They also use metal properties, but I can't recall the specifics.
EL
Eliz 9 months ago
I think this is about thermocouples, right? I remember studying how they work with different metals to measure temperature.
KR
Kristofer 9 months ago
Hmm, I think the thermocouple is the way to go here. The description matches up pretty well, and I remember the professor going over how they work. I'll mark that as my final answer.
BE
Bernardine 9 months ago
Wait, is it a pyrometer? The question mentions measuring temperature, and a pyrometer uses radiation to determine the temp. I'm a bit unsure now, maybe I should double-check the definitions.
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Milly 10 months ago
I'm pretty sure it's the Thermocouple. Sounds like the most technical answer.
CA
Carmen 10 months ago
Thermocouple, of course! That's the one with the magic wires that can tell the temperature.
BE
Bernadine 10 months ago
Okay, I've got this. It's definitely a thermocouple - the key details are the pair of different metal wires and the voltage comparison to a reference junction. I'm confident this is the right answer.
CH
Cherry 10 months ago
That's definitely a thermocouple!
LO
Lore 10 months ago
Hmm, Thermocouple seems like the right choice here. I bet it's the one that can measure really high temperatures too.
BR
Brandon 11 months ago
Ugh, I'm not sure about this one. The wording is really confusing. I'll have to think it through carefully and try to eliminate the options that don't fit the description.
DO
Donte 11 months ago
Hmm, this sounds like it's asking about a thermocouple. I remember learning about those in class - they use the voltage difference between two different metals to measure temperature.
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Martha 5 months ago
↳ replying to Donte
I’d go with C) Thermocouple for sure!
BE
Beula 5 months ago
↳ replying to Donte
Exactly! They’re great for industrial uses.
MA
Matthew 6 months ago
↳ replying to Donte
I remember they can measure a wide range of temperatures too.
MA
Mariann 6 months ago
↳ replying to Donte
Yeah, they’re really useful in many applications.
SH
Sharee 6 months ago
↳ replying to Donte
I think you're right! Thermocouples are pretty cool.
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