Topics: All categories in the pool
1: The reversing valve is commonly used
- on multiple compressor systems
- on commercial system that involve two different temperatures
- when the code requires a check valve
- on all heat pumps
2: A start capacitor in series with a start winding will
- increase starting torque
- decrease the amp draw of the motor
- increase running efficiency
- increase the amp draw of the motor
3: What pipe can not be used for refrigeration?
- M
- L
- N
- K
4: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Low pressure
- Simple
- R-414B
5: How many forces operate a thermostatic expansion valve?
- 1
- 4
- 2
- 3
6: Heat transferred by conduction from one body to another is done
- via solids
- via radiation
- via liquids
- via heat rays
7: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
8: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
9: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- low side of the system
- the liquid side of the system
- the vapor side of the system
10: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
11: Which creates more of a heat load?
- 70% RH
- 30% RH
- 90% RH
- 50% RH
12: What device measures the specific gravity of a substance?
- Manometer
- Hygrometer
- Hydrometer
- Thermometer
13: Ammonia systems use ____ pressure to adjust oil pressure
- stream
- discharge
- air
- liquid
14: Foaming of oil in a compressor is most likely to occur
- when the evaporator temperatures are below 32F
- when there is insufficient air across the condenser(i.e., dirty coil)
- at start-up
- when ambient temperature are low
15: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
16: What instrument is used to measure very high resistance?
- voltmeter
- meg ohmmeter
- ammeter
- tape measure
17: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
- Because it's cheap
- Because it's water
18: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
- to release a sticking valve
- to sweat flanges on the refrigeration piping
19: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
20: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 15 uf
- 25 uf
- 20 uf
- 40 uf
21: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 600
- 400
- 500
22: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 70.8 psig
- 43.3 psig
- 66.1 psig
23: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 4%
- 1%
- 25%
- 2%
24: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
25: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected