ACR108 Intro Automatic Controls (Cengage) (CRF) - Mr. Graham

What is the device that consists of two unlike metal strips that are attached and have a different rate of expansion and contraction?

• Thermistor

• Thermacouple

• Diaphragm

• Bimetal

What are some applications of the bimetal strip?

• Room thermostat, motor overload, temperature indicator

• Room thermostat, compressor, TXV

• Evaporator, Indoor coil, Thermistor

• Sight glass, Reversing valve, Heat strip

How can the bimetal strip be extended to have more travel per degree of temperature change?

• Wound in a coil or helix

• Wound in a coil or compressor

• Wound in series

• Wound in reversing valve

What two metals can be used in the bimetal device or the rod and tube?

• Brass and copper

• Brass and steel

• Stainless steel, metal

• Iron and Copper

A thin, flexible metal disc with a large surface area is a_________.

• Valve

• Bimetal strip

• Bellow

• Diaphragm

An accordian-type device with a large internal volume that has a lot of travel is referred to as a __________.

• Bellows

• Spring

• Bimetal Disc

• Diaphragm

A bellow has more travel than a diaphragm.

• True

• False

Which type of fluid is normally found in a bellows?

• Liquid

• Gas

• Vapor

• Solid

Which of the following is a device consisting of two unlike metals fastened at one end that, when heated on the fastened end, produces a DC current?

• Thermacouple

• Thermistor

• Diaphragm

• Bimetal

A variable resistor that changes resistance with a change in temperature.