Unit 1

Question 1

Convert 150°F to Celsius

Answer 1

65.56 C

Question 2

0 C converted into Fahrenheit

Answer 2

32 F

Question 3

-30 C converted into Fahrenheit

Answer 3

-22 F

Question 4

350 C converted into Fahrenheit

Answer 4

662 F

Question 5

Which temperature is the hottest?
A. 600R
B. -20C
C. 150F
D. 380k

Answer 5

D. 380K

Question 6

-400 F converted into Celsius

Answer 6

-240 C

Question 7

True or False

Latent heat is also known as hidden heat because it can’t be measured.

Answer 7

True

Question 8

True or false
The Uninsulated portion of the suction line should be warm and dry.

Answer 8

False it should be cold and sweaty

Question 9

True or false
Specific heat is the amount of heat necessary to raise the temperature of one pound of water 1 F.

Answer 9

False (1lb of any substance)

Question 10

True or false
As you gain elevation/altitude, atmospheric pressure decreases.

Answer 10

True

Question 11

True or false
A compound pressure gauge reads pressure above and below atmospheric pressure.

Answer 11

True

Question 12

True or false
System superheat is measured by placing a thermocouple on the suction line right before it enters the compressor.

Answer 12

True

Question 13

True or false
The instrument that measures atmospheric pressure is called the Bourdon tube.

Answer 13

False

Question 14

True or false
Pressure is defined as force per unit of area

Answer 14

True

Question 15

True or false
When water at 212 F boils, it is only absorbing latent heat.

Answer 15

True

Question 16

The two common temperature scales used by air conditioning and refrigeration technicians are called _______ and _________

Answer 16

1. Fahrenheit scale
2. Celsius scale

Question 17

Heat that changes the temperature of a substance is called ________ heat.

Answer 17

Sensible

Question 18

Convert psig to psia
325 psig

Answer 18

339.70 psia

Question 19

Convert psia into psig
235 psia

Answer 19

220.304 psig

Question 20

Convert inches of HG (mercury) vacuum to psia
15 in HG

Answer 20

7.5 psia

Question 21

Convert HG to psia
6in HG

Answer 21

12 psia

Question 22

Gauge that can read pressures above and below atmospheric pressure.

Answer 22

Compound gauge

Question 23

Energy traveling from one molecule to another within a substance.

Answer 23

Conduction

Question 24

Instrument used to measure atmospheric pressure.

Answer 24

Barometer

Question 25

Absolute scale of Fahrenheit.

Answer 25

Rankine scale

Question 26

Level of heat.

Answer 26

Temperature

Question 27

14.696 psi at sea level.

Answer 27

Standard condition

Question 28

Gaseous state of a substance.

Answer 28

Vapor

Question 29

Movement of molecules within a substance.

Answer 29

Molecular motion

Question 30

Amount of energy required to change a substance into a vapor.

Answer 30

Latent heat of vaporization

Question 31

As the temperature of a material increases, the molecules in the material _______.
A. Stop moving
B. Travel faster
C. Slow down
D. Travel in more of a parallel direction

Answer 31

B. Travel faster

Question 32

True or false
Silicone elastomers, used in seals and gaskets, are not compatible with HFO refrigerants.

Answer 32

True

Question 33

What should be used to remove ice from sight glasses or viewing glasses?

Answer 33

Alcohol Spray

Question 34

Persons who maintain, service, repair or dispose of appliances containing more than 5 lbs of refrigerant, or if the installation of such equipment requires refrigerant charging, must be certified as Type ____ technicians.

Answer 34

Type 2

Question 35

De-superheating takes place in what basic component of the refrigeration system?

Answer 35

Condenser

Question 36

In order for a pound of 60 F water to boil, how many btus of heat must be added to it?

Answer 36

152BTUs

Question 37

What do the inner rings of numbers and different colors of an analog manifold gauge indicate?

Answer 37

Outter ring = Pressure
Colors = Refrigerants
Numbers = Temperature