Deck 17: Temperature Sensing Devices

Question 1

The ____________________ is the most common heat sensing device used in the production of room thermostats and thermometers.

Answer 1

bimetal strip

Question 2

Figure 17-11
The accompanying figure is showing a(n) ____________________.

Answer 2

thermopile

Question 3

A thermistor that has a positive temperature coefficient will decrease its resistance as the temperature increases.

Answer 3

False

Question 4

A common method of sensing a change of temperature is by the increase of pressure of some chemicals.

Question 5

Why must electrical contacts never be permitted to open or close too slowly?

Question 6

When a metal bar is mechanically held at one end, it permits the amount of expansion to be in one direction.

Question 7

The amount of voltage produced by a thermocouple is determined by what two things?

Question 8

Because of their nonlinear characteristics, thermistors are often used as set point detectors as opposed to actual temperature measurement.

Question 9

The resistance temperature detector (RTD) is made of ____________________ wire.

Question 10

Describe a bimetal strip.

Question 11

A very common device that uses the principle of expanding metal to operate a set of contacts is the ____________________ relay found in the refrigeration industry.

Question 12

Metal expands when heated. The amount of expansion is proportional to what two factors?

Question 13

Thermocouples produce high voltages.

Question 14

Name the two different types of thermistors.

Question 15

When two dissimilar metals are joined at one end, and that junction is heated, a voltage is produced. This is known as the ____________________.