Topics: All categories in the pool
1: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
2: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
3: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- installed through a pipe casing
- leak checked
- moisture barrier
4: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 20 uf
- 25 uf
- 40 uf
- 15 uf
5: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Pressurized
- Insulated
- Inspected
6: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-113
- R-12
- R-502
7: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
8: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
9: 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-718
- Flush with RX-11
- Flush with R-11
- Flush with ammonia
10: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
11: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 3.0
- 2.5
- 2.0
12: B3 refrigerants are considered
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic and highly flammable
13: Name a reason that does not cause reduced condenser air quantity
- Dirty fan blades
- Dirty Coil
- High ambient temperature
- Prevailing winds
14: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 12,000
- 60
- 720,000
15: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 600 psig
- 1000 psig
- 200 psig
16: When must refrigeration system covered by the code be inspected?
- Annually
- Upon installation
- Annually and when installed
- Not required
17: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 96
- 38
- 88
- 58
18: What refrigerant is an inorganic compound?
- R-132A
- Ammonia
- R-410A
- R-22
19: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
20: While water is evaporated in an evaporative condenser the impurities which were in the water are
- remain in the air
- accumulate in the sump water
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
21: A moisture indicator must
- be filled with liquid
- be sight side up
- be yellow
- change color when exposed to moisture
22: 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
23: The color code of a tank of ammonia is
- lavender
- silver
- white
- light green
24: Control systems can be classified by
- tonnage of system
- economy of operation
- safety
- source of power
25: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- breaker panel in