Commercial Refrigeration Unit 16
Questions and Answers 100% Correct
How deep should the condensate drain trap be? - ANSWER - 3 inches deep (teacher agrees,
this answer is bullshit)
Commercial refrigeration equipment for ice cream storage typically uses: - ANSWER - Low
temperature evaporators
The wet coil static pressure drop is - ANSWER - Higher than the dry coil static pressure drop
For what is the last part of the evaporator used? - ANSWER - Superheat the refrigerant
Refrigerant enters as a saturated mixture and leaves as a: - ANSWER - superheated vapor
What does it mean for a condenser and evaporator coil to be an "AHRI Match" - ANSWER -
AHRI has tested the components and certified that they work correctly together
The percentage of air that travels through a tube and fin coil without touching any coil surface is
called the: - ANSWER - Bypass factor
On a commercial refrigeration system with electric defrost, what does the compressor do during
the defrost cycle? - ANSWER - it shuts off
The refrigeration system component that absorbs heat out of the product is the - ANSWER -
evaporator
Commercial refrigeration equipment for meat storing typically uses - ANSWER - Medium
temperature evaporators
What controls the length of the defrost cycle on most commercial refrigeration systems? -
ANSWER - The defrost termination thermostat
, A solution used as a secondary refrigerant in chillers consisting of water and a chemical which
lowers the water's freezing point is called - ANSWER - Brine
On a commercial refrigeration system with electric defrost, what does the evaporator fan do
during the defrost cycle? - ANSWER - it shuts off
The purpose of the trap in a condensate drain is to - ANSWER - offset the negative pressure on
the drain that can prevent the water from draining
How does an air defrost system work? - ANSWER - Air from in the store is directed over the
evaporator
Latent cooling - ANSWER - Removes water from the air
To increase latent cooling capacity - ANSWER - Reduce the airflow over the evaporator
Commercial refrigeration equipment for dry storage typically uses: - ANSWER - high
temperature evaporators
An evaporator in which refrigerant enters as a saturated liquid vapor mix and leaves as a
superheated vapor is a: - ANSWER - Direct expansion evaporator
In a flooded chiller - ANSWER - The water is in the tubes and the refrigerant is in the shell
What happens to the evaporator fan motor when the defrost cycle is terminated? - ANSWER -
The fan shuts off until the defrost termination thermostat senses that the evaporator is cold
again
Increasing the airflow across a coil - ANSWER - Increases the bypass factor
How is a brine solution created? - ANSWER - Salt and water are mixed
Questions and Answers 100% Correct
How deep should the condensate drain trap be? - ANSWER - 3 inches deep (teacher agrees,
this answer is bullshit)
Commercial refrigeration equipment for ice cream storage typically uses: - ANSWER - Low
temperature evaporators
The wet coil static pressure drop is - ANSWER - Higher than the dry coil static pressure drop
For what is the last part of the evaporator used? - ANSWER - Superheat the refrigerant
Refrigerant enters as a saturated mixture and leaves as a: - ANSWER - superheated vapor
What does it mean for a condenser and evaporator coil to be an "AHRI Match" - ANSWER -
AHRI has tested the components and certified that they work correctly together
The percentage of air that travels through a tube and fin coil without touching any coil surface is
called the: - ANSWER - Bypass factor
On a commercial refrigeration system with electric defrost, what does the compressor do during
the defrost cycle? - ANSWER - it shuts off
The refrigeration system component that absorbs heat out of the product is the - ANSWER -
evaporator
Commercial refrigeration equipment for meat storing typically uses - ANSWER - Medium
temperature evaporators
What controls the length of the defrost cycle on most commercial refrigeration systems? -
ANSWER - The defrost termination thermostat
, A solution used as a secondary refrigerant in chillers consisting of water and a chemical which
lowers the water's freezing point is called - ANSWER - Brine
On a commercial refrigeration system with electric defrost, what does the evaporator fan do
during the defrost cycle? - ANSWER - it shuts off
The purpose of the trap in a condensate drain is to - ANSWER - offset the negative pressure on
the drain that can prevent the water from draining
How does an air defrost system work? - ANSWER - Air from in the store is directed over the
evaporator
Latent cooling - ANSWER - Removes water from the air
To increase latent cooling capacity - ANSWER - Reduce the airflow over the evaporator
Commercial refrigeration equipment for dry storage typically uses: - ANSWER - high
temperature evaporators
An evaporator in which refrigerant enters as a saturated liquid vapor mix and leaves as a
superheated vapor is a: - ANSWER - Direct expansion evaporator
In a flooded chiller - ANSWER - The water is in the tubes and the refrigerant is in the shell
What happens to the evaporator fan motor when the defrost cycle is terminated? - ANSWER -
The fan shuts off until the defrost termination thermostat senses that the evaporator is cold
again
Increasing the airflow across a coil - ANSWER - Increases the bypass factor
How is a brine solution created? - ANSWER - Salt and water are mixed
