Codersimon. Stuvia
,Codersimon. Stuvia
CHAPTER 1 Refrigeration
CHAPTER 2 Evaporators.
CHAPTER 3 Condensers
CHAPTER 4 Compressors
CHAPTER 5 Metering Devices
CHAPTER 6 Controls and Accessories
CHAPTER 7 Refrigeration System Troubleshooting
CHAPTER 8 Compressor Motor Controls
CHAPTER 9 Retrofitting, Recovery, Evacuation, and Charging
CHAPTER 10 Supermarket Refrigeration
CHAPTER 11 Walk-in Refrigerators and Freezers
CHAPTER 12 Ice Machines
CHAPTER 13 Product Temperatures for Preservation
CHAPTER 14 Refrigeration Business Tips
Marking Scheme
page 54
, Commercial
Refrigeration for
Air Conditioning
Technicians
Fifth Edition
Dick Wirz
, C H A P T E R 1 Refrigeration
R E V I E W Q U E S T I O N S
Refer to Figures 1–1 to 1–4 for questions 6–11:
b What is considered the “normal” box
temperature of a walk-in refrigerator?
a. 35°F–37°F
g What is the pressure throughout the high side
of the system?
b. 38°F–40°F a. 229 psig
c. −10°F b. 278 psig
d. 0°F c. 49 psig
d. 69 psig
c What is considered the “normal” box
temperature of a reach-in refrigerator?
a. 35°F–37°F
h At what temperature does the refrigerant
condense?
b. 38°F–40°F a. 125°F
c. −10°F b. 115°F
d. 0°F c. 100°F
d. 95°F
d What is considered the “normal” box
temperature of a walk-in freezer?
a. 35°F–37°F
I What is the temperature of the subcooled
liquid in the condenser?
b. 38°F–40°F a. 125°F
c. −10°F b. 115°F
d. 0°F c. 95°F
d. 10°F
e What is considered the “normal” box
temperature of a reach-in freezer?
a. 35°F–37°F
j What is the pressure drop across the TEV?
a. 229 psig
b. 38°F–40°F b. 278 psig
c. −10°F c. 49 psig
d. 0°F d. 69 psig
f Why is the temperature of walk-ins usually
1) R22 refrigerant at 49 psig boils at what
lower than the temperature of reach-ins? temperature?
a. Walk-ins are designed for long-term storage a. 75°F
and lower temperatures.
b. 35°F
b. Reach-ins are designed for long-term storage
c. 25°F
and lower temperatures.
d. 10°F
c. Reach-ins are small and cannot hold low
temperatures.
,Codersimon. Stuvia
CHAPTER 1 Refrigeration
CHAPTER 2 Evaporators.
CHAPTER 3 Condensers
CHAPTER 4 Compressors
CHAPTER 5 Metering Devices
CHAPTER 6 Controls and Accessories
CHAPTER 7 Refrigeration System Troubleshooting
CHAPTER 8 Compressor Motor Controls
CHAPTER 9 Retrofitting, Recovery, Evacuation, and Charging
CHAPTER 10 Supermarket Refrigeration
CHAPTER 11 Walk-in Refrigerators and Freezers
CHAPTER 12 Ice Machines
CHAPTER 13 Product Temperatures for Preservation
CHAPTER 14 Refrigeration Business Tips
Marking Scheme
page 54
, Commercial
Refrigeration for
Air Conditioning
Technicians
Fifth Edition
Dick Wirz
, C H A P T E R 1 Refrigeration
R E V I E W Q U E S T I O N S
Refer to Figures 1–1 to 1–4 for questions 6–11:
b What is considered the “normal” box
temperature of a walk-in refrigerator?
a. 35°F–37°F
g What is the pressure throughout the high side
of the system?
b. 38°F–40°F a. 229 psig
c. −10°F b. 278 psig
d. 0°F c. 49 psig
d. 69 psig
c What is considered the “normal” box
temperature of a reach-in refrigerator?
a. 35°F–37°F
h At what temperature does the refrigerant
condense?
b. 38°F–40°F a. 125°F
c. −10°F b. 115°F
d. 0°F c. 100°F
d. 95°F
d What is considered the “normal” box
temperature of a walk-in freezer?
a. 35°F–37°F
I What is the temperature of the subcooled
liquid in the condenser?
b. 38°F–40°F a. 125°F
c. −10°F b. 115°F
d. 0°F c. 95°F
d. 10°F
e What is considered the “normal” box
temperature of a reach-in freezer?
a. 35°F–37°F
j What is the pressure drop across the TEV?
a. 229 psig
b. 38°F–40°F b. 278 psig
c. −10°F c. 49 psig
d. 0°F d. 69 psig
f Why is the temperature of walk-ins usually
1) R22 refrigerant at 49 psig boils at what
lower than the temperature of reach-ins? temperature?
a. Walk-ins are designed for long-term storage a. 75°F
and lower temperatures.
b. 35°F
b. Reach-ins are designed for long-term storage
c. 25°F
and lower temperatures.
d. 10°F
c. Reach-ins are small and cannot hold low
temperatures.
