Topics: All categories in the pool
1: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- higher
- there is no Group B1 refrigerants
- lower
2: Name three things that must be done when changing refrigeration lubricant?
- Place sign, check for leaks, insulate
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
- You can't change lubricants.
3: When using nitrogen for brazing, the pressure should be:
- Very low
- Slightly below atmospheric
- 50-100 psig
- 125 psig
4: While the system is operating, the discharge line should be
- at the same temperature as the crankcase
- room temperature
- 10-15F warmer than ambient
- too hot to hold by hand
5: The color code of a tank of ammonia is
- silver
- white
- light green
- lavender
6: A thermometer inside a duct measures ____ heat.
- specific
- hidden
- latent
- sensible
7: Start to Run windings will have what resistance?
- All will be at equal values
- The most resistance value
- The least resistance value
- Somewhere between the actual start winding and run winding resistance value
8: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
9: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 20 amps
- 10 amps
- 24 amps
10: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, paper method, and frost line.
11: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
12: How is bring measured?
- manometer
- anemometer
- hydrometer
- hygrometer
13: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
14: A Low-Probability System
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
15: A water regulating valve opens when
- when the power is on there is an overcharge of refrigerant
- the head pressure rises
- the compressor is on
- when the power is on
16: What refrigerant doesn't have to be classifted?
- R-134a
- R-718
- R-717
- R-711
17: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
18: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 25
- 10
- 15
19: What are the three components of a transformer?
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
20: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
21: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
22: Can ammonia be used on domestic system?
- yes
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
- no
23: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- inlet of the low temperature evaporator.
- outlet of low temperature evaporator
- outlet of the liquid line
24: A hissing noise at the expansion valve is a good indication that
- expansion valve is oversized
- nothing is passing thru
- gas is passing thru it
- liquid is passing thru it
25: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 1%
- 4%
- 2%
- 25%