Topics: All categories in the pool
1: 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
2: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
3: What type refrigerant is NOT ozone depleting?
- CFC
- Halon
- HFC
- HCFC
4: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
5: Refrigerants shall be classified by
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
- color codes
- maximum permissible quantities of each group
6: 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 as well as a temperature protection device
- over pressure protection
- over pressure protection and a rupture disc
7: How many opening forces operate a thermostatic expansion valve?
- 2
- 1
- 4
- 3
8: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
9: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
10: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
11: Three-phase motors have what type of windings?
- three run windings and 3 start windings
- one start winding and one run winding.
- three start windings
- three run windings
12: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
13: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
14: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- .9776 watts
- 9.776 watts
- 9,776 watts
- 977.6 watts
15: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
16: 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 cause the condenser to sweat
- it would have no effect on the condenser
17: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- institutional occupancy
- illegal occupancy
- public assembly occupancy
- commercial occupancy
18: A self contained system
- is a complete factory made and tested system
- is a unit system Group I refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a unit system Group II refrigerants only
19: What refrigerant were phased out in 2004?
- R-134a
- R-12
- R-11
- R-22
20: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
21: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
22: Clearance volume
- has no effect on compressor capacity
- varies depending on compressor speed
- is the same on all compressors
- affects compressor capacity
23: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
24: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
25: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 14 days
- 30 days
- 2 months
- 1 week