Topics: All categories in the pool
1: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with ammonia
- Flush with R-718
- Flush with RX-11
2: Capacity control on a centrifugal compressor is accomplished by the
- post-rotational guide vanes
- check valves
- peroration guide vanes
- slide vanes
3: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Therm
- 1 Kelvin
- The rate of conduction
- 1 BTU
4: R-22 is considered a(n)
- CFC
- HCFC
- HCFCH
- HFC
5: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
6: The instrument used to measure the specific gravity of absorption chiller solutions is the
- anemometer
- hydrometer
- Psychrometer
- refractometer
7: Pipe identification labels are required when the system contains more than
- 55 lbs
- 110 lbs
- 120 lbs
- 65 lbs
8: What instrument is used to measure very high resistance?
- meg ohmmeter
- voltmeter
- tape measure
- ammeter
9: 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
10: Which creates more of a heat load?
- 90% RH
- 30% RH
- 50% RH
- 70% RH
11: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Aluminum
- Stainless Steel
- Copper
12: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 3.0, 3.5
- 2.5, 2.5
- 6.6, 6.6
- 2.5, 3.0
13: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-113
- R-502
- R-12
14: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 5.5
- 2.5
- 3.0
15: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- methyl chloride
- ammonia
- R-718
- trichlorotrifluoromethane
16: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Notify the Fire Marshal that the system has been inspected and approved
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
17: A class B1 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
18: Ammonia (NH3) is a group III refrigerant
- True
- False
19: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
20: The Department that certifies the transportation of refrigerant is the
- EPA
- EPO
- RSES
- DOT
21: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
22: What is potential measured in?
- Volts
- Ohms
- Henrys
- Amps
23: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When it's used as part of a supply or return air system
- When there are sprinklers above
- When there is a space 6' or more above it
- When its white
24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- 977.6 watts
- .9776 watts
- 9,776 watts
25: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 144 BTU
- 24,000 BTU
- 970 BTU
- 12,000 BTU