Exam 13: Introduction to Automatic Controls

Modulating controls are used to ____.

Adding length to a bimetal element is done by shaping the element. The shapes used are coiled, helix, hairpin, and ____________________.

A bellows is much like a(n) ____________________ ̶ it has a lot of internal volume and a lot of travel.

Fluid expansion is a way to sense temperature change .

Explain the difference between a Positive Temperature Coefficient (PTC) thermistor and a Negative Temperature Coefficient (NTC) thermistor.

How can pressure be used to control the temperature of a refrigerated space?

The most popular type of bimetal element used for temperature control of a gas hot water heater is rod and ____________________.

When referring to thermocouples, the hot  ____________________ is at a higher temperature level than the cold ____________________.

Bellows are normally used with a vapor instead of a liquid inside it.

Brass and steel have a different rate of expansion and contraction when heated or cooled .