Topics: All categories in the pool
1: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- 20 CFM
- .5 CFM
- 5 CFM
2: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 13.9 lbs
- 6.6 lbs
- 22 lbs
- 44 lbs
3: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- annually
- every 18 months
4: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.5
- 2.2
- 1.2
5: The density of a gas refers to
- pounds per cubic foot
- cubic feet per pound
- pounds per square foot
- pounds per absolute pressure
6: Foaming of oil in a compressor is most likely to occur
- at start-up
- when the evaporator temperatures are below 32F
- when ambient temperature are low
- when there is insufficient air across the condenser(i.e., dirty coil)
7: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 15
- 10
- 25
8: Halo-carbon refrigerants cannot be used with what material?
- Stainless Steel
- Aluminum
- Copper
- Magnesium alloy
9: Cooling tower lowers condenser water temp by
- running water thru a secondary heat exchanger
- running fans at 100%
- evaporative cooling
- condensation
10: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
11: A declaration test is needed when the system contains more than
- 55 lbs
- 65 lbs
- 110 lbs
- 120 lbs
12: Control systems can be classified by
- tonnage of system
- economy of operation
- source of power
- safety
13: Thermodynamics is the branch of science that deals with
- state of energy
- molecular therory
- heat energy
- energy due to motion
14: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
15: A hissing noise at the expansion valve is a good indication that
- nothing is passing thru
- gas is passing thru it
- expansion valve is oversized
- liquid is passing thru it
16: Doors communicating with outside from a mechanical room must be?
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
17: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed in Class T machinery rooms
- shall be installed per instruction of the AHJ
- shall be allowed to be used for human comfort.
18: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
19: 1 Watt = ______ BTU's?
- 3.412
- 12
- 4.482
- 7.216
20: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
21: Lithium-bromide, Li-Br, is best characterized as a
- sand
- salt
- soil
- sugar
22: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Sensible heat
- Latent heat
- Enthalpy
- Specific heat
23: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Contractor who last serviced the system.
- Board of Boilers
- Person in charge of the facility
24: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 25
- 66
- 50
- 22
25: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-22
- R-11