Topics: All categories in the pool
1: The evaporator is a device to
- Keep the compressor busy
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- store liquid refrigerant
2: "I" represents _______ in the Watt's law formula.
- voltage
- reactance
- amperage
- watts
3: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
4: Electricity involves the movement of electrons in atoms
- True
- False
5: 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
6: What is the minimum size wire you can use on a 30 amp circuit?
- 12 AWG
- 14 AWG
- 10 AWG
- 16 AWG
7: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
8: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
9: 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
10: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- 977.6 watts
- 9,776 watts
- .9776 watts
11: What must be done if refrigeration lines pass through a concrete floor?
- leak checked
- insulated
- installed through a pipe casing
- moisture barrier
12: The absorber shell contains the
- condenser and the generator
- evaporator and the absorber
- condenser and the absorber
- condenser, the evaporator, and the generator
13: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
14: Low pressure systems have what kind of compressor?
- Rotary
- Reciprocating
- Centrifugal
- Scroll
15: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
16: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 6.6
- 330
- 110
- 1,000
17: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would make the condenser more efficient
- it would make the condenser less efficient
- it would have no effect on the condenser
- it would cause the condenser to sweat
18: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
- one ton of cooling
19: Which of the following is NOT a positive displacement compressor?
- centrifugal
- scroll
- screw
- reciprocating
20: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- compressor
- evaporator
- outside the machinery room
21: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
22: The Board of Boilers adopts by reference
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code
- MSCA Code
- the MACS Pressure Vessel Code of Massachusetts
23: How are a compressor and condenser fan wired?
- series
- parallel-series
- series-parallel
- parallel
24: What is R-22?
- CCFCM
- Chlorofluoromethane
- Chlorodifluoromethane
- HFC
25: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Classifed
- Insulated and installed in a pipe duct (Encased)
- Leak checked
- Certified