Topics: All categories in the pool
1: A device used to measure small pressure differences is the
- phsycometirc
- pyrometer
- anemometer
- manometer
2: A halide torch is most useful with a freon compression system
- to sweat flanges on the refrigeration piping
- to remove from from TXV's and evaporator coils
- to release a sticking valve
- to detect refrigeration leaks in piping joints
3: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
4: In a system designed for sub-zero ambient temperatures, what must be added?
- Nitrogen
- Booster compressor
- Low-ambient kit
- Infrared dye for leak identification
5: Gauge pressure is
- Force of pressure above that of atmosphere
- Atmospheric pressure
- Absolute pressrue
- Barometric pressure
6: Indirect systems using Group II refrigerants
- shall be used in refrigeration system less than 1,000 lbs
- shall be used for mechanical equipment only
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system in excess of 1,000 lbs
7: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- business occupancy
- mercantile occupancy
- commercial occupancy
8: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 1,000F
- 800F
9: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
10: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Not required
- Annually
- Upon installation
11: Viscosity is
- the ability of oil to flow
- the coefficient of external friction
- measure of weight
- a measure of heat content
12: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 40'
- At least 20'
- There is no minimum for relief valve and windows.
- At least 30'
13: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
14: What refrigerant were phased out in 2004?
- R-11
- R-12
- R-22
- R-134a
15: What device should be used on low-temperature freezers?
- discharge muffler
- high capacity TXV
- hot-gas by-pass
- oil separator
16: Relief valves are rated in
- pounds of air per minute
- gallons of water per hour
- gallons of water per minute
- pounds of air per hour
17: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
18: 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
19: All serviceable components of a refrigeration system shall be provided with
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- safe access
- manufactures instructions on start-up procedures
20: Halo-carbon refrigerants cannot be used with what material?
- Aluminum
- Magnesium alloy
- Copper
- Stainless Steel
21: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class T machinery room
- Class B machinery room
- Class M machinery room
22: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
23: R-22 falls under which safety classification?
- B-1
- B-2
- A-2
- A-1
24: Bubbles in the liquid line sight glass could be caused by
- overcharge of oil
- plugged drier
- leaking discharge valves in the compressor
- bad low pressure switch
25: On a large centrifugal system, what meters the flow to the evaporator?
- Low side float
- TXV
- Cap tube.
- High side float