HVACR UNIT 16 Exam| 61
Questions and Answers 100%
Correct
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.
Air-conditioning tube-and-fin coils are commonly available as: - ANSWER - Slab coils,
slant coils, "A" coils, and "N" coils.
An evaporator in which refrigerant enters as a saturated liquid vapor mix and leaves
as a superheated vapor is a: - ANSWER - Direct expansion evaporator.
An evaporator that covers the coils being cooled with liquid refrigerant is a: -
ANSWER - Flooded evaporator.
As a mixture travels through an evaporator, the liquid percentage: - ANSWER -
Decreases.
Chillers can be classified as: - ANSWER - Flooded or direct expansion.
Commercial refrigeration equipment for dry storage typically uses: - ANSWER - High-
temperature evaporators.
Commercial refrigeration equipment for eggs, produce, and dairy uses: - ANSWER -
Medium-temperature evaporators.
Commercial refrigeration equipment for ice cream storage typically uses: - ANSWER
- Low-temperature evaporators.
, Compared to air-conditioning evaporator coils, commercial refrigeration coils have: -
ANSWER - Fewer fins per inch.
Direct-expansion coils operating below the dew point of the entering airstream will:
- ANSWER - Cool the water vapor (humidity) in the air and condense it as droplets
on the coil.
Flooded evaporators are used in: - ANSWER - Large chillers.
For which of the following actions is the last part of the evaporator used? - ANSWER
- Superheating the refrigerant
Heat flows from the product into the evaporator because: - ANSWER - The
evaporator is at a lower temperature than the product.
How can a technician verify that a condenser and evaporator are an AHRI match? -
ANSWER - Check them out on the AHRI web site.
How deep should the condensate drain trap be? - ANSWER - 4 inches deep
How does a hot-gas defrost system work? - ANSWER - Hot compressor discharge gas
is routed to the evaporator.
How does an air-defrost system work? - ANSWER - Air from inside the store is
directed over the evaporator.
How is a brine solution created? - ANSWER - Salt and water are mixed.
If an evaporator does not have to superheat refrigerant vapor, which of the
following can be produced? - ANSWER - Greater cooling capacity
In a direct-expansion chiller: - ANSWER - The water is in the shell and the refrigerant
is in the tubes.
Questions and Answers 100%
Correct
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.
Air-conditioning tube-and-fin coils are commonly available as: - ANSWER - Slab coils,
slant coils, "A" coils, and "N" coils.
An evaporator in which refrigerant enters as a saturated liquid vapor mix and leaves
as a superheated vapor is a: - ANSWER - Direct expansion evaporator.
An evaporator that covers the coils being cooled with liquid refrigerant is a: -
ANSWER - Flooded evaporator.
As a mixture travels through an evaporator, the liquid percentage: - ANSWER -
Decreases.
Chillers can be classified as: - ANSWER - Flooded or direct expansion.
Commercial refrigeration equipment for dry storage typically uses: - ANSWER - High-
temperature evaporators.
Commercial refrigeration equipment for eggs, produce, and dairy uses: - ANSWER -
Medium-temperature evaporators.
Commercial refrigeration equipment for ice cream storage typically uses: - ANSWER
- Low-temperature evaporators.
, Compared to air-conditioning evaporator coils, commercial refrigeration coils have: -
ANSWER - Fewer fins per inch.
Direct-expansion coils operating below the dew point of the entering airstream will:
- ANSWER - Cool the water vapor (humidity) in the air and condense it as droplets
on the coil.
Flooded evaporators are used in: - ANSWER - Large chillers.
For which of the following actions is the last part of the evaporator used? - ANSWER
- Superheating the refrigerant
Heat flows from the product into the evaporator because: - ANSWER - The
evaporator is at a lower temperature than the product.
How can a technician verify that a condenser and evaporator are an AHRI match? -
ANSWER - Check them out on the AHRI web site.
How deep should the condensate drain trap be? - ANSWER - 4 inches deep
How does a hot-gas defrost system work? - ANSWER - Hot compressor discharge gas
is routed to the evaporator.
How does an air-defrost system work? - ANSWER - Air from inside the store is
directed over the evaporator.
How is a brine solution created? - ANSWER - Salt and water are mixed.
If an evaporator does not have to superheat refrigerant vapor, which of the
following can be produced? - ANSWER - Greater cooling capacity
In a direct-expansion chiller: - ANSWER - The water is in the shell and the refrigerant
is in the tubes.
