Topics: All categories in the pool
1: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 10 amps
- 20 amps
- 24 amps
- There isn't enough information to answer.
2: The reversing valve is commonly used
- when the code requires a check valve
- on multiple compressor systems
- on all heat pumps
- on commercial system that involve two different temperatures
3: Low-side system leaks in a low-pressure chiller will often result in
- water being pulled into the system
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
- air being pulled into the system
4: While water is evaporated in an evaporative condenser the impurities which were in the water are
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
- remain in the air
- accumulate in the sump water
5: Stop valves shall not be permitted between the system and the
- condenser
- relief valve
- bleed valve
- service valve
6: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 720,000
- 12,000
- 60
7: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
8: 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
- 455 psig, 185 psig.
- 257 psig, 77 psig
- 365 psig, 120 psig
- 226 psig, 68 psig
9: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the low side
- the high side
10: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- there is no Group B1 refrigerants
- lower
- higher
11: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
12: An oil pressure safety switch should be set at
- 5 to 10 psi above low side pressure
- 5 to 10 psi below low side pressure
- 10-15 psi above low side pressure
- 10 to 15 psi below low side pressure
13: A solder joint melts at temperatures of
- 400F to 800F
- 1,200F to 1,500F
- 600F to 900F
- less than 400F
14: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
15: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
16: How many flammability classifications are refrigerants in?
- 2
- 7
- 3
- 5
17: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- 10
- III
18: A self contained system
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a unit system Group I refrigerants only
- is a complete factory made and tested system
- is a unit system Group II refrigerants only
19: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
20: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- 1 Therm
- 1 BTU
- The rate of conduction
21: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 12,000 BTU
- 144 BTU
- 24,000 BTU
22: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
23: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
24: What type refrigerant is NOT ozone depleting?
- CFC
- HCFC
- HFC
- Halon
25: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 5/8"
- 3/8"
- 3/4"