Topics: All categories in the pool
1: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 90%
- 80%
- 99%
- 75%
2: A single pole-double throw switch uses how many wires?(excluding the ground)
- 3
- 2
- 5
- 4
3: 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
4: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
5: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
6: What is an egress?
- An escape route
- A code violation
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
7: Indirect systems using Group II refrigerants
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used in refrigeration system less than 1,000 lbs
8: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
9: 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
- compressor
- boiler
- evaporator
- outside the machinery room
10: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
11: 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
12: Give an example of a secondary coolant?
- R-410A
- R-718
- R-717
- R-12
13: What type refrigerant is NOT ozone depleting?
- CFC
- Halon
- HCFC
- HFC
14: Booster compressors connect to the ____ side of the compressor
- oil side
- vapor
- liquid
- low side
15: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
16: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 30 days
- 14 days
- 2 months
17: How many refrigerant classifications are there for toxicity?
- 1
- 2
- 3
- 5
18: 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
19: Capacity control on a centrifugal compressor is accomplished by the
- slide vanes
- post-rotational guide vanes
- check valves
- pre-rotational guide vanes
20: What is the amp draw of a 40 VA transformer at 24 volts
- 1K amps
- 1.6 amps
- 1,000 amps
- 106 amps
21: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
22: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
23: 746 watts is equal to
- 10 hp
- 1 hp
- Pi
- 100 hp
24: Bubbles in the liquid line sight glass could be caused by
- overcharge of oil
- leaking discharge valves in the compressor
- bad low pressure switch
- plugged drier
25: In an electrical circuit, what is potential measured in?
- Volts
- Ohms
- Herys
- Amps