Topics: All categories in the pool
1: A halide torch is most useful with a freon compression system
- to remove from from TXV's and evaporator coils
- to detect refrigeration leaks in piping joints
- to sweat flanges on the refrigeration piping
- to release a sticking valve
2: Who is permitted to access a refrigeration machine room?
- Anyone, it's a completely safe area
- Contractors only
- Any employee
- Authorized persons only
3: On a single phase motor, when does the start winding cut out?
- At 50% of its full rated speed
- At 75% of its full rated speed
- Start windings do no cut-out of the run cycle
- At 25% of its full rated speed
4: 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
5: What refrigerant doesn't have to be classifted?
- R-134a
- R-717
- R-711
- R-718
6: The formula for Pure Power in a resistance circuit is
- Watts X power factor
- Kw = volts X amps
- Watts X amps.
- Watts = volts X amps
7: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Copper oxide formation is prevented
- Discoloration is prevented
- Exterior scale formation is minimized
8: Horizontal piping should be run level.
- False
- Yes, if the condenser is located above the evaporator
- True
- No, unless the supervisor on the job says so.
9: All serviceable components of a refrigeration system shall be provided with
- manufactures instructions on start-up procedures
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- safe access
- service manuals
10: Ammonia vaporization takes place at what temperature?
- -32F
- -460F
- -28F
- -110F
11: What type of relief valve is used on a CO2 system?
- gate valve
- glove disc
- rupture disc
- fusible plug
12: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 14 days
- 1 week
- 2 months
13: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
14: What is NOT a positive displacement compressor.
- Rotary
- Scroll
- Reciprocating
- Centrifugal
15: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
16: The low pressure oil safety switch
- resets itself after the time delay has terminated
- resets itself automatically
- must be reset manually
- never trips
17: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 8'4"
- 7.25'
- 7.00'
18: Liquid line filter-driers on a 410A system must be rated for no less than
- 1000 psig
- 600 psig
- 200 psig
- 400 psig
19: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
20: A low oil switch is typically
- automatic reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
- manual reset
21: NH3 is
- ammonia
- lithium bromide
- R-718
- R-508A
22: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
23: Crankcase heaters are energized
- while the compressor is running
- to prevent compressor freeze-up
- to allow easy compressor start-up
- when the compressor is off
24: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
25: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person who pulled the permit
- Board of Boilers
- Person in charge of the facility