Topics: All categories in the pool
1: Increasing superheat will do what to your frost line?
- Increasae
- Nothing
- Could either increase or decrease depending on the load conditions
- Decrease
2: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
3: How many BTU's is produced by one watt of energy
- 2.57
- 3.41
- 3.00
- 1
4: The measurement of heat in a particular substance is
- specific heat
- latent heat
- sensible heat
- enthalpy
5: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
6: What would be the classification for Stop & Shop grocery store?
- Industrial
- Large mercantile
- Place of assembly
- Instituional
7: Ammonia belongs to Group
- A-1
- B-1
- A-2
- B-2
8: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 25
- 10
- 15
- 20
9: Gauge pressure is
- absolute pressure
- force of pressure above that of atmospheric
- atmospheric pressure
- what a gauge reads when checking pressures on a chilled water system.
10: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
11: An oil pressure safety switch should be set at
- 10-15 psi above low side pressure
- 10 to 15 psi below low side pressure
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
12: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- -40F to 0F
- 30F to 50F
- 0F-38F
13: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
14: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
- plugged drier
15: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 75%
- 80%
- 90%
16: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 120v
- 277v
- 240v
- 208v
17: Give an example of a secondary coolant?
- R-717
- R-410A
- R-718
- R-12
18: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
19: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- low pressure
- high pressure
- design pressure
20: Humidity can be sensed with
- bimetal
- human hair
- thermometer
- pressure bellows
21: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices
- shall use fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
22: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 25
- 22
- 66
- 50
23: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
24: Stop valves shall not be permitted between the system and the
- bleed valve
- condenser
- relief valve
- service valve
25: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 1000 psig
- 200 psig
- 600 psig