Topics: All categories in the pool
1: Halogenated refrigerants cannot be used with what material?
- Copper
- Aluminum
- Stainless steel
- Magnesium alloy
2: How much refrigerant can be stored in a mechanical room outside of the system?
- 330
- 200
- 150
- 100
3: The actual expansion curve of compressor follows most nearly which one of the following
- Pressure-Temperature
- Isothermal
- Volume
- Adiabatic
4: What refrigerant doesn't have to be classifted?
- R-718
- R-134a
- R-717
- R-711
5: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 2.2
- 1.5
- 1
6: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-113
- R-22
- R-11
- R-12
7: A halide torch is most useful with a freon compression system
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
- to detect refrigeration leaks in piping joints
- to release a sticking valve
8: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
9: Secondary refrigerants are usually
- alcohol
- expensive
- water or brine
- Prestone anti-freeze
10: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- evaporator
- outside the machinery room
- compressor
- boiler
11: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- institutional occupancy
- illegal occupancy
- public assembly occupancy
- commercial occupancy
12: R-11 belongs to Group
- B-3
- A-1
- A-2
- B-1
13: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
14: What is R-22?
- CCFCM
- HFC
- Chlorodifluoromethane
- Chlorofluoromethane
15: 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
16: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
17: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Scroll
- Centrifugal
- Screw
18: Total heat of a substance is considered
- specific heat
- enthalpy
- empathetical
- sensible heat
19: The instrument used to measure the specific gravity of absorption chiller solutions is the
- anemometer
- hydrometer
- refractometer
- Psychrometer
20: 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
21: Gauge pressure is
- atmospheric pressure
- force of pressure above that of atmospheric
- what a gauge reads when checking pressures on a chilled water system.
- absolute pressure
22: What type of copper is not permitted on refrigeration systems?
- Type M
- Type N
- Type K
- Type L
23: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's cheap
- Because it's water
- Because it's a non-flammable refrigerant
- R-718 is not rated unlimited because it's a dangerous refrigerant
24: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 15'
- 20'
- 30'
25: Excessive head pressure is often caused by
- leaking reed valve on the discharge side
- insufficient refrigerant
- air cooled condenser is plugged
- thermostat set too high