Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

1: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

• 13.9 lbs
• 44 lbs
• 6.6 lbs
• 22 lbs

2: What is an example of institutional occupancy?

• Football stadium
• Hospital
• Shopping mall
• Dorms

3: Which refrigerant(s) is an HFC?

• R-22
• R-410A
• R-502
• All of the above

4: A EPR valve is installed on what type of evaporators?

• high-temperature evaporators
• low-temperature evaporators
• plate evaporators
• shell and tube evaporators

5: Industrial occupancy is

• a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
• is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
• a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
• Both a and b are correct

6: Which of the following is NOT a positive displacement compressor?

• scroll
• centrifugal
• reciprocating
• screw

7: Start to Run windings will have what resistance?

• The most resistance value
• The least resistance value
• All will be at equal values
• Somewhere between the actual start winding and run winding resistance value

8: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

• 3/4"
• 3/8"
• 5/8"
• 1/2"

9: High pressure controls should be set no higher than

• 80% of set point
• 25% of set point
• 90% of set point
• 10% of set point

10: Laten heat is associated with a change in state of a refrigerant but not temperature

• True
• False

11: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

• 10
• 15
• 25
• 20

12: A 24 volt transformer with a 240 volt primary can handle how many amps?

• 20 amps
• 24 amps
• There isn't enough information to answer.
• 10 amps

13: A start capacitor in series with a start winding will

• decrease the amp draw of the motor
• increase starting torque
• increase running efficiency
• increase the amp draw of the motor

14: At higher altitudes, boiling temperatures

• decrease
• depends on the refrigerant
• increase
• are unaffected

15: Name a CFC refrigerant(s):

• R-11
• R-12
• R-123
• both a & b

16: What is the leaving chilled water set point for water chiller systems?

• 38F
• 45F
• 55F
• 66F

17: A start capacitor is wired in _____ with the start windings.

• parallel
• junction
• series-parallel
• series

18: Viscosity is

• measure of weight
• a measure of heat content
• the coefficient of external friction
• the ability of oil to flow

19: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

• 330
• 1,000
• 110
• 6.6

20: Can ammonia be used on domestic system?

• no, unless there is proper ventilation system installed
• no
• yes, for systems under 10 tons
• yes

21: The two basic types of evaporators are

• finned and plate
• prime surface and finned
• flooded and direct expansion
• direct expansion and plate

22: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

• lost heat
• specific heat
• sensible heat
• latent heat

23: Clearance volume

• has no effect on compressor capacity
• affects compressor capacity
• varies depending on compressor speed
• is the same on all compressors

24: A class B2 refrigerant is considered

• toxic and somewhat flammable
• non-toxic and non-flammable
• non-toxic and highly flammable
• toxic and non-flammable

25: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

• True
• False