Commercial and Industrial Refrigeration Systems
Commercial and Industrial Refrigeration Systems
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Question 1 |
In cold storage, life processes continue in _____.
A | fish |
B | fruits and vegetables |
C | meats and meat products |
D | dairy products |
Question 2 |
In ammonia liquid recirculation systems, ammonia is supplied to the evaporators from the _____.
A | low-pressure receiver |
B | high-pressure manifold |
C | high-pressure receiver |
D | evaporative condenser |
Question 3 |
A refrigerant-side method used to control air-cooled condensers in response to varying loads is to
_____.
A | use a condenser with two or more selectable equal parallel sections, with each section capable
of handling an equal amount of the load |
B | change the fan speed |
C | cycle one or more fans on or off |
D | modulate the compressor unit dampers |
Question 4 |
The factors you must consider when planning cold storage of food include all of the following
except the _____.
A | type of refrigerant |
B | humidity level maintained in the storage room |
C | length of time the food can be stored |
D | temperature maintained in the storage room |
Question 5 |
The latent heat method of hot gas defrost _____.
A | initiates a defrost cycle when lowered air velocity indicates frost on the coil |
B | passes condensed refrigerant directly to the evaporator coil being defrosted |
C | defrosts one evaporator at a time while the other evaporators remain refrigerating |
D | turns the refrigeration unit off until the frost on the evaporator melts |
Question 6 |
Unit coolers used in areas that require low humidity levels normally have _____ evaporator coils
that operate with a _____ air-to-refrigerant temperature differential.
A | smaller; higher |
B | smaller; lower |
C | larger; smaller |
D | larger; larger |
Question 7 |
Freezer rooms used to store frozen foods are typically maintained at temperatures ranging between
_____.
A | –15°F and 0°F |
B | –30°F and –20°F |
C | 0°F and +32°F |
D | –10°F and +10°F |
Question 8 |
The condenser pressure regulator (head pressure control) is used in a refrigeration system to
maintain proper head pressures in an air-cooled condenser when the _____.
A | outside air temperature is low |
B | refrigerant charge is low |
C | outside air temperature is high |
D | compressor is idle |
Question 9 |
Thermostatic expansion valves used with HCFC-22 produce rated capacity at a _____ psig
pressure drop.
A | 150 |
B | 200 |
C | 100 |
D | 50 |
Question 10 |
In the freezing process, sensible heat is removed from the product being frozen _____.
A | in the latent heat of fusion zone and below |
B | in the latent heat of fusion zone and above |
C | in the latent heat of fusion zone |
D | above and below the latent heat of fusion zone |
Question 11 |
An evaporator pressure regulator (EPR) valve _____.
A | is installed between the expansion valve and evaporator |
B | is installed between the evaporator and compressor |
C | responds to the outlet pressure of the evaporator |
D | opening decreases as the evaporator temperature increases |
Question 12 |
When compared to an open, self-service display case, the refrigeration system capacity for a
reach-in cooler used to store the same quantity of a similar product typically is about _____ size.
A | one quarter the |
B | twice the |
C | the same |
D | half the |
Question 13 |
One advantage blast freezing offers over some other forms of freezing is _____.
A | that dehydration is minimized |
B | that it is the most rapid freezing method |
C | the ability to freeze foods of irregular size and shape |
D | that foods become lighter in weight and need no future refrigeration |
Question 14 |
A fluid commonly used in cryogenic freezing is liquid _____.
A | carbon monoxide |
B | HFC-134a |
C | nitrogen |
D | HCFC-22 |
Question 15 |
A satellite compressor _____.
A | is normally connected to a freezer/cooler that operates at a higher temperature than the
freezers/coolers being maintained by the related parallel-connected compressors |
B | is rarely used to cool ice cream freezers |
C | normally operates at a higher suction pressure than the related parallel-connected
compressors |
D | is normally connected to a freezer/cooler that operates at a lower temperature than the
freezers/coolers being maintained by the related parallel-connected compressors |
Question 16 |
The crankcase pressure regulating valve is _____.
A | used in systems with multiple evaporators that operate at different temperatures to control
the evaporator temperatures |
B | adjusted for the minimum pressure specified by the manufacturer |
C | used to control system capacity in addition to limiting evaporator temperature |
D | used to control the maximum pressure at the compressor suction line in order to protect the
compressor motor from overload |
Question 17 |
An accessory often found in a refrigeration system hot gas line is the _____.
A | sightglass/moisture indicator |
B | receiver |
C | filter-drier |
D | oil separator |
Question 18 |
When selecting evaporators and/or unit coolers for connection to a specific compressor(s), never
group _____.
A | produce cases with cutting room walk-in coolers |
B | frozen food cases with the ice cream cases |
C | frozen food cases with the dairy cases |
D | all the frozen food cases together |
Question 19 |
An optional process used in mobile refrigeration systems to minimize ripening of produce to
extend its shelf life is _____.
A | nitrogen control (NC) |
B | controlled atmosphere (CA) |
C | humidity control (HC) |
D | carbon dioxide control (CO2C) |
Question 20 |
An accessory used to evaporate refrigerant from oil is the _____.
A | oil line strainer |
B | suction line accumulator |
C | crankcase heater |
D | oil separator |
Question 21 |
The programmed staging of three equally sized compressors connected in parallel will result in
_____.
A | the same number of capacity steps as three compressors of different sizes |
B | more steps of capacity than if using three compressors of different sizes |
C | TXV hunting and frequent defrost cycles |
D | fewer steps of capacity than if using three compressors of different sizes |
Question 22 |
The unit cooler installed in a walk-in cooler normally contains the system _____.
A | condenser |
B | compressor |
C | evaporator |
D | thermostat |
Question 23 |
Connecting two or more smaller compressors in parallel normally results in _____ if one larger
compressor is used.
A | a lower Btu-per-horsepower capacity than |
B | the same Btu-per-horsepower as |
C | a lower initial cost than |
D | a higher Btu-per-horsepower capacity than |
Question 24 |
An accessory that protects the compressor from taking in slugs of liquid refrigerant or compressor
oil is called a _____.
A | suction line filter |
B | suction line accumulator |
C | receiver |
D | check valve |
Question 25 |
The main advantage of using a single compressor to supply multiple evaporators is that it _____.
A | can easily adjust to widely varying loads |
B | simplifies the configuration of the evaporator piping |
C | eliminates cycling problems |
D | is cheaper |
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