Topics: All categories in the pool
1: A capacitor in series with the start windings will do what?
- Decrease the RLA to within 10% of its rating
- Nothing
- Increase starting torque
- Increase run efficiency by 10% of its rating
2: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
3: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
4: The evaporator is a device to
- Keep the compressor busy
- absorb heat into the refrigeration system
- store liquid refrigerant
- remove heat from the refrigeration system
5: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
6: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 15'
- 20'
- 30'
7: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- institutional occupancy
- public assembly occupancy
- commercial occupancy
- mixed occupancy
8: Heat transferred by conduction from one body to another is done
- via liquids
- via solids
- via heat rays
- via radiation
9: How many refrigerant classifications are there for toxicity?
- 2
- 1
- 3
- 5
10: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Temperature range and hazardousness
- Flammability and toxicity
11: Class A refrigerants are considered
- toxic
- non-flammable
- non-toxic
- flammable
12: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 80%
- 100%
- 75%
13: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Magnesium
- Aluminum
- Zinc
14: What is Absolute Zero?
- -460F
- -400F
- -640F
- -773F
15: A restaurant is classified as a
- large mercantile occupancy
- commercial occupancy
- public assembly occupancy
- mixed occupancy
16: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
17: Which refrigerant is lighter than air?
- R-717
- R-123
- R-134a
- R-11
18: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
19: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- flash line
- discharge line
- liquid line
20: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- A-1
- B-1
- B-2
21: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
22: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- True
- depends on the type of refrigerant being used
- False
- are obsolete.
23: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- merge
- purge
- surge
- splurge
24: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
25: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above