Topics: All categories in the pool
1: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
2: When the compressor is below the condensor
- traps are needed on the oil return line
- traps are needed on the suction line
- traps are needed on the discharge line
- traps are not needed on this type of system
3: The solution that leaves the concentrator in an absorption chiller is referred to as the
- diluted solution
- strong solution
- absorbed solution
- weak solution
4: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
5: An electronic bridge circuit is basically a
- suspension
- Wheatstone
- high voltage circuit
- 24 volt control circuit
6: A hotel is considered a _______ occupancy.
- commercial
- mercantile
- residential
- institutional
7: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- There isn't enough information to answer.
- 2.5
- 1250
- 2
8: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
9: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 13.9 lbs
- 22 lbs
- 44 lbs
- 6.6 lbs
10: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- HCFC
- Halon
11: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-22
- R-123
- R-11
12: Lithium-bromide, Li-Br, is best characterized as a
- salt
- sugar
- sand
- soil
13: Increasing superheat will do what to your system?
- Increase liquid flow
- Decrease liquid flow
- Nothing
- Increase gas flow
14: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
15: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
16: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 48
- 18
- 24
17: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
18: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Low pressure
- R-414B
- Simple
- Cascade
19: Increasing superheat will do what to your frost line?
- Increasae
- Nothing
- Decrease
- Could either increase or decrease depending on the load conditions
20: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
21: Pressure is the equivalent of
- force per unit area
- force times area
- force
- area times force
22: Which oil is hydoscopic?
- SW30
- polyolester
- animal
- mineral
23: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the aggregate of the high side and low side
- the high side
- 2.5 times the design pressure
24: 1 Watt = ______ BTU's?
- 7.216
- 3.412
- 12
- 4.482
25: Which refrigerant class listed below is the most flammable?
- A2
- C3
- A3
- B2