Topics: All categories in the pool
1: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
2: The most common type of motor starter is
- duel-winding starter
- across the line starter
- delts-wye starter
- part winding starter
3: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
- shall be posted on the compressor shell or electrical panel at the unit
4: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
5: What would be the classification of a prison?
- Large mercantile
- Institutional
- Place of assembly
- Industrial
6: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
7: Fractionation occurs when
- the pressures decreases as the heat load decreases
- 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
- the pressures increase as the heat load increases
8: Which creates more of a heat load?
- 90% RH
- 70% RH
- 50% RH
- 30% RH
9: The density of a gas refers to
- pounds per absolute pressure
- pounds per cubic foot
- pounds per square foot
- cubic feet per pound
10: What refrigerant were phased out in 2004?
- R-12
- R-22
- R-134a
- R-11
11: Adjusting the spring pressure on a TXV
- changes subcooling
- adjusts the bulb charge
- changes superheat
- makes no difference
12: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Upon installation
- Annually and when installed
13: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- A-1
- B-2
14: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Low pressure
- Cascade
- R-414B
- Simple
15: Who authorizes the form of certificate of completion of refrigeration systems that should be used?
- Massachusetts Board of Boiler Rules
- Fire Marshal
- Supervisor or project manager in charge of the installation
- Owner
16: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 330
- 110
- 6.6
17: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- licensed welder
- licensed technician
- competent welder
- welder qualified
18: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- evaporator
- outside the machinery room
- compressor
19: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
20: Can you use Ammonia in industrial applications?
- No, never
- When mixed with R-718
- Yes, always
- Yes, Under certain condidtions
21: What is an egress?
- A valve put on the low side of the system to prevent frosting
- A code violation
- An escape route
- An entrance or exit
22: What is not a requirement of a class T machine room?
- self-closing doors
- fire hose connection to the building fire protection system
- automatic ventilation
- tight fitting doors
23: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
24: How many forces operate a thermostatic expansion valve?
- 3
- 2
- 4
- 1
25: A professional or office building would be considered what type of occupancy?
- mercantile
- business
- public assembly
- commercial