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ACR108: Unit 13 Practice Test (CRF) - Mr. Graham

Authored by Randall Graham

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ACR108: Unit 13 Practice Test (CRF) - Mr. Graham
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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Electrical, mechanical, electromechanical, digital, and pneumatic are all types of ________.

circuit boards

controls

fuses

motors

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

_________ are typically normally closed devices that open their contacts only when the device senses system conditions that are outside the designed operating range.

Safety devices

Rod & tube controls

Pneumatic controls

Bimetal devices

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The main purpose of the HVAC/R industry is to control space or product conditions by controlling _________.

power consumption, temperature, and fuel efficiency

air quality, air infiltration, and air distribution

temperature and power consumption

temperature, humidity, air quality, and air cleanliness

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When a bimetal device is heated, the steel expands faster than the brass, which causes the device to warp.

True

False

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

To make bimetal devices practical over a wider temperature range, ________.

the voltage to the device is modulated

the device should be mounted perfectly

the bimetal strip is shortened

the bimetal strip is lengthened

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A column of temperature-sensitive fluid rising and falling within a hollow stem in response to a sensed temperature or level of heat intensity best describes the function of a ________.

thermometer

snap-disc

pneumatic control

thermistor

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A ________ is a thin, flexible, movable membrane that is used to convert pressure changes to movement or motion in a control.

snap-disc

bimetal coil

control bulb

diaphragm

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