Topics: All categories in the pool
1: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
2: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 110
- 330
- 6.6
3: The two basic types of evaporators are
- direct expansion and plate
- finned and plate
- prime surface and finned
- flooded and direct expansion
4: Which refrigerant is lighter than air?
- R-134a
- R-717
- R-123
- R-11
5: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
- is on where brine is cooled & circulated to the space refrigerated
- is a self-contained complete factory made and tested system
6: What refrigerant doesn't have to be classifted?
- R-717
- R-711
- R-718
- R-134a
7: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 36
- 18
- 24
8: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Place of assembly
- Instituional
- Industrial
9: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall be prohibited
10: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 70.8 psig
- 43.3 psig
- 66.1 psig
- 50.2 psig
11: What section governs pressure vessels?
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- OSHA
- Section ASHREA 34
12: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
13: At higher altitudes, boiling temperatures
- are unaffected
- depends on the refrigerant
- decrease
- increase
14: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
15: The measurement of heat in a particular substance is
- enthalpy
- sensible heat
- latent heat
- specific heat
16: Low pressure chiller systems use what type of compressor?
- Scroll
- Screw
- Reciprocating
- Centrifugal
17: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
18: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
19: Before replacing a seized compressor, the _______ should be determinded.
- type of refrigerant
- designed head pressure
- cause of seizure
- current draw
20: What is not a requirement of a Class T machine room?
- Automatic ventilation
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Self-closing doors
21: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
- the owner shall be informed
22: Heat is a form of
- energy
- power
- matter
- work
23: How many gallons of water do you need per pound of ammonia?
- 10
- 1
- 100
- 50
24: A self contained system
- is a unit system Group I refrigerants only
- is a unit system Group II refrigerants only
- is a complete factory made and tested system
- is any system or part of a system used to increase evaporation by expansion or vaporization
25: Viscosity is
- the ability of oil to flow
- a measure of heat content
- measure of weight
- the coefficient of external friction