Topics: All categories in the pool
1: How many different groups of refrigerants are there?
- 7
- 15
- 11
- 3
2: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the compressor
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- inside the room, immediately adjacent to each door
3: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
4: A single pole-double throw switch uses how many wires?(excluding the ground)
- 2
- 5
- 4
- 3
5: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Low pressure
- R-414B
- Simple
6: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
7: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- thermostat
- low pressure switch
- low-ambient controller
8: The solution that leaves the concentrator in an absorption chiller is referred to as the
- strong solution
- diluted solution
- absorbed solution
- weak solution
9: The measurement of heat in a particular substance is
- enthalpy
- sensible heat
- latent heat
- specific heat
10: An oil pressure safety switch should be set at
- 10-15 psi above low side pressure
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10 to 15 psi below low side pressure
11: Which refrigerant class listed below is the most flammable?
- C-3
- A-3
- B-2
- A-1
12: Ammonia is under what safety classification?
- A3
- B2
- B1
- B3
13: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- load-side of the contactor in
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
14: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
15: B3 refrigerants are considered
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
16: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
17: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
18: At higher altitudes, boiling temperatures
- increase
- are unaffected
- depends on the refrigerant
- decrease
19: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
20: "E" represents _____ in the Watt's law formula.
- watts
- reactance
- amperage
- voltage
21: If the power element on an expansion valve should lose its charge, the valve would
- Stay open
- Under feed
- Close
- Over feed
22: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
23: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
24: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UM or UL
- UV or UR
- UL and UR
25: What is used to check very low air pressures in air conditioning duct?
- Anemomter
- Barometer
- Vacuum gauge
- Manometer