Topics: All categories in the pool
1: What is the refrigerant chlorodifluoromethane?
- R-22
- R-134a
- R-123
- R-12
2: 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
3: The oil separator is always inserted in the system
- where it can be easily serviced
- in a cool spot
- in the discharge line
- to prevent oil logging
4: Large mercantile occupancy is
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
5: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- float type switch that stops the compressor when the pressure on the high side becomes too high
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
6: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Flanged and gasketed
- Welded and seamed.
- Insulated and cross broke
7: Which creates more of a heat load?
- 50% RH
- 30% RH
- 90% RH
- 70% RH
8: How many flammability classifications are refrigerants in?
- 3
- 5
- 2
- 7
9: If the spring is adjusted to increase the superheat, this new setting will
- allow more liquid into the evaporator
- lengthen the frost line
- shorten the frost line
- have no effect on the frost line
10: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 257 psig, 77 psig
- 455 psig, 185 psig.
- 365 psig, 120 psig
- 226 psig, 68 psig
11: What do you need to do when you install a new system?
- Add refrigerant
- Have it inspected
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
12: How many groups of refrigerants are there?
- 5
- 7
- 3
- 1
13: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
- no flames shall be permitted
14: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- air being pulled into the system
- nitrogen leaking out of the system.
- water being pulled into the system
15: An accumulator can be located between the
- compressor and condenser
- condenser and evaporator
- first stage and second stage compressors
- evaporator and compressor
16: How many opening forces operate a thermostatic expansion valve?
- 4
- 3
- 1
- 2
17: 1 HP = ____ Watts?
- 746
- 3,412
- 11,239
- 3.1416
18: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UM or UL
- UL and UR
- UV or UR
- UL and UM
19: 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
20: What refrigerant is an inorganic compound?
- R-22
- R-132A
- Ammonia
- R-410A
21: Horizontal piping should be run level.
- Yes, if the condenser is located above the evaporator
- True
- No, unless the supervisor on the job says so.
- False
22: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 2
- 5
- 3
23: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
24: Heat is a form of
- matter
- work
- power
- energy
25: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b