Topics: All categories in the pool
1: What is Trichlorotrifluoromethane?
- R-12
- R-13
- R-113
- R-11
2: Capacity control on a centrifugal compressor is accomplished by the
- post-rotational guide vanes
- pre-rotational guide vanes
- slide vanes
- check valves
3: What would be the classification for Stop & Shop grocery store?
- Place of assembly
- Large mercantile
- Industrial
- Instituional
4: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
5: The most common type of motor starter is
- duel-winding starter
- delts-wye starter
- part winding starter
- across the line starter
6: The solution that leaves the concentrator in an absorption chiller is referred to as the
- strong solution
- weak solution
- diluted solution
- absorbed solution
7: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
8: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
9: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- two tons of cooling
- 12,000 tons of cooling
- three tons of cooling
10: How much refrigerant can be stored in a mechanical room outside of the system?
- 330
- 150
- 100
- 200
11: 746 watts is equal to
- 10 hp
- 1 hp
- 100 hp
- Pi
12: A device used to measure small pressure differences is the
- pyrometer
- phsycometirc
- anemometer
- manometer
13: Class 3 refrigerants are
- non-toxic
- toxic
- non-flammable
- highly flammable
14: A run capacitor is wired in series with the _____ windings.
- run
- start
- start capacitor
- common
15: What does an anemometer measure?
- temperature
- velocity
- voltage
- amperage
16: "E" references ____ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
17: Low ambient controls are used when
- when systems run all year round
- always
- economizers are used
- on air conditioning systems only
18: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 1/16"
- 1/8"
- 3/32"
19: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
20: What device measures the specific gravity of a substance?
- Thermometer
- Hygrometer
- Manometer
- Hydrometer
21: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100
- 1,000
- 10,000
- 100,000
22: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- illegal occupancy
- institutional occupancy
- public assembly occupancy
- commercial occupancy
23: Which occupancy can ammonia be used in?
- commercial
- industrial
- depends on the quantity of freon
- redifential
24: One ton of refrigeration is defined as ______ btu/minute.
- 720,000
- 60
- 12,000
- 200
25: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- lift voltage
- boost voltage
- pick up voltage