Question 542General Subjects - Assistant Engineer

70% to pass

Which of the listed temperature sensors consists of finely coiled wire, such as platinum, where the resistance varies directly with temperature?

AThermistor

BBimetallic device

CResistance temperature detector

DThermocouple

AI Explanation

The correct answer is C) Resistance temperature detector (RTD). An RTD consists of a coil of finely wound wire, often made of platinum, whose electrical resistance changes in direct proportion to changes in temperature. This direct relationship between resistance and temperature is what makes the RTD the correct choice among the provided options. The other options are not correct because: A) a thermistor is a semiconductor device whose resistance changes with temperature, B) a bimetallic device relies on the differential expansion of two metals to indicate temperature, and D) a thermocouple generates a small voltage proportional to temperature, rather than using resistance.

Related Questions

Q@q.QuestionNumber:Spring reinforced oil seals are generally installed with the tail or lip of the ... Q@q.QuestionNumber:The locking plates shown in the illustration are used in many marine application... Q@q.QuestionNumber:For the operation of the illustrated device, what fluid flow would be expected a... Q@q.QuestionNumber:Which of the following statements is correct regarding the device shown in the i... Q@q.QuestionNumber:In a low-pressure air compressor, the loss of volumetric efficiency normally res...

Ready to test your knowledge?

Take a General Subjects - Assistant Engineer Practice Exam

Official Resources

46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center

← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App