Topics: All categories in the pool
1: Where is the high-side float located on a chiller system?
- discharge line
- inside the chiller barrel
- liquid line
- flash line
2: How many closing forces operate a thermostatic expansion valve?
- 2
- 1
- 3
- 4
3: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
4: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Sensible heat
- Specific heat
- Latent heat
- Enthalpy
5: How many square inches per square foot?
- 64
- 24
- 98
- 144
6: R-22 is considered a(n)
- HFC
- HCFC
- HCFCH
- CFC
7: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 22 lbs
- 13.9 lbs
- 44 lbs
8: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- design pressure
- high pressure
- low pressure
- critical pressure
9: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 30F to 50F
- -100F to -40F
- -40F to 0F
- 0F-38F
10: Refrigerants shall be classified by
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- color codes
- toxicity and flammability
11: The gauge thickness required on a CO2 tank construction is
- 1/8"
- 5/16"
- 1/16"
- 3/32"
12: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Zinc
- Copper
- Magnesium
13: What section governs pressure vessels?
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- OSHA
14: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Water and soap
- Oil and water
- Moisture and air
15: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
16: What type of copper is not permitted on refrigeration systems?
- Type M
- Type L
- Type N
- Type K
17: A hotel is considered a _______ occupancy.
- commercial
- institutional
- residential
- mercantile
18: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 660 lbs
- 55 lbs
- 330 lbs
19: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
20: When energized, a normally open relay will be
- noisy
- open
- closed
- depends on the type and class of the relay
21: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
22: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 240v
- 208v
- 277v
- 120v
23: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and toxicity
- Weight and color
- Flammability and temperature range
24: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- weak solution
- strong solution
- diluted solution
25: What would be the classification for Stop & Shop grocery store?
- Instituional
- Place of assembly
- Industrial
- Large mercantile