Topics: All categories in the pool
1: Stop valves shall not be permitted between the system and the
- condenser
- service valve
- relief valve
- bleed valve
2: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- relief plug
- fusion plug
- rupture plug
3: What refrigerant doesn't have to be classified?
- R-422A
- R-718
- R-717
- R-134A
4: On a large centrifugal system, what meters the flow to the evaporator?
- TXV
- Low side float
- High side float
- Cap tube.
5: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more diluted
- Rust can form
- System operating pressure will drop
- The Li-Br solution will become more concentrated
6: A single pole-double throw switch used how many wires excluding the ground wire?
- three
- four
- five
- two
7: Increasing superheat will do what to your system?
- Increase gas flow
- Increase liquid flow
- Nothing
- Decrease liquid flow
8: Can ammonia be used on domestic system?
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
- yes
9: What type of oil is used in R-410A systems?
- polyolester (POE)
- naphthene
- mineral oil
- polyalkylene glycol (PAG)
10: How are safety controls wired in a circuit?
- Series/parallel
- Either series or parallel
- Series
- Parallel
11: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
12: The oil separator is always inserted in the system
- where it can be easily serviced
- to prevent oil logging
- in the discharge line
- in a cool spot
13: "I" represents _______ in the Watt's law formula.
- watts
- amperage
- reactance
- voltage
14: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000
15: What is potential measured in?
- Volts
- Amps
- Ohms
- Henrys
16: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- methyl chloride
- trichlorotrifluoromethane
- ammonia
- R-718
17: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
18: Two systems using separate refrigerants that are superimposed upon one another is called
- indirect
- cascade
- single stage
- booster
19: What would be the classification of a prison?
- Institutional
- Place of assembly
- Large mercantile
- Industrial
20: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the discharge line
- traps are needed on the suction line
- traps are needed on the oil return line
21: Who authorizes changes to the safety codes?
- Board of Boilers
- Person in charge of the facility
- Person who pulled the permit
- Contractor who last serviced the system.
22: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 350
- 50
- 550
23: Fractionation occurs when
- the pressures decreases as the heat load decreases
- the pressures increase as the heat load increases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- when a fraction of refrigerant is added as the full charge
24: How is bring measured?
- hygrometer
- hydrometer
- manometer
- anemometer
25: A capacitor in series with the start windings will do what?
- Increase starting torque
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating