Topics: All categories in the pool
1: Total heat of a substance is considered
- empathetical
- sensible heat
- specific heat
- enthalpy
2: A declaration test is needed when the system contains more than
- 65 lbs
- 55 lbs
- 110 lbs
- 120 lbs
3: When should a relief valve start to function?
- Two times it's working pressure
- At it's set pressure
- Before the purge station discharges
- 10 psi before it's set pressure
4: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- anemometer
- hydrometer
- Psychrometer
5: What is the state of the refrigerant leaving the evaporator?
- low temperature superheated vapor
- a high temperature subcooled liquid
- a high temperature superheated vapor
- a low temperature subcooled liquid
6: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Certified
- Insulated and installed in a pipe duct (Encased)
- Classifed
- Leak checked
7: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
8: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
9: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 2
- 1
10: What is the leaving chilled water set point for water chiller systems?
- 38F
- 66F
- 55F
- 45F
11: What section governs pressure vessels?
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- OSHA
12: Which refrigerant replaced R-12?
- R-134A
- R-22
- R-410A
- R-407A
13: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-22
- R-12
- R-123
14: Class T machine room
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
15: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- service valve
- condenser
16: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 square feet or less
- 3 cubic feet or more
- 15 cubic feet or more
17: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will thicken
- oil will foam
- oil level will rise
18: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 600 psig
- 200 psig
- 1000 psig
19: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- institutional occupancy
- commercial occupancy
- public assembly occupancy
20: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
21: 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 R-718
- Flush with RX-11
- Flush with ammonia
22: Single compound Refrigerants are classified by what two criteria?
- Weight and color
- Temperature range and hazardousness
- Flammability and temperature range
- Flammability and toxicity
23: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Aluminum
- Stainless Steel
- Copper
24: What does an anemometer measure?
- velocity
- temperature
- amperage
- voltage
25: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- PVC
- Magnesium alloy
- Copper