Topics: All categories in the pool
1: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 100
- 24
- 75
2: Pressure relief valves shall be marked with the data from
- Section XIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
3: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
4: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
5: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Flammability and toxicity
- Weight and color
- Temperature range and hazardousness
6: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
7: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Water and soap
- Moisture and air
- Air and dirt
- Oil and water
8: Trichlorofluoromethane is the name of what refrigerant?
- R-113
- R-12
- R-11
- R-502
9: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- low suction pressure
- high head pressure
- increased capacity
10: The actual expansion curve of compressor follows most nearly which one of the following
- Pressure-Temperature
- Adiabatic
- Volume
- Isothermal
11: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- of Group B2 refrigerant shall be prohibited
12: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- sand
- soil
- salt
13: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- lower
- higher
- there is no Group B1 refrigerants
14: Each machinery room shall contain
- high and low pressure controls
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
15: How many refrigerant classifications are there for toxicity?
- 1
- 3
- 5
- 2
16: The heat picked up in the evaporator must equal to
- the heat lost by the medium being cooled
- the heat of compression
- the heat giving by the condenser
- the heat gained by the condenser
17: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Make sure it's compatible, notify owner, notify AHJ
- Place sign, check for leaks, insulate
- Nothing must be done
18: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
19: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 330
- 150
- 100
20: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- far apart or greater difference
- a ling psychrometer doesn't have two theremometers.
- nearly the same
21: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Contractors only
- Anyone, it's a completely safe area
- Any employee
22: 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
23: What is Absolute Zero?
- -773F
- -460F
- -640F
- -400F
24: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- flash line
- discharge line
- liquid line
25: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less