Topics: All categories in the pool
1: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 330
- 150
- 100
2: Pressure relief valves shall be marked with the data from
- Section XIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
3: When using nitrogen for brazing, the pressure should be:
- 50-100 psig
- Very low
- Slightly below atmospheric
- 125 psig
4: The main purpose of the accumulator is to
- provide space for the accumulation of oil and containminants
- prevent liquid slugs at the compressor
- provide space for vapor to accumulate
- store liquid refrigerant
5: Booster compressors, pump refrigerant into the
- receiver
- heat & plate heat exchanges
- high side of the secondary compressor
- low side of the primary compressor
6: 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
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- sight glass, weight, paper method, and frost line.
7: Booster compressors connect to the ____ side of the compressor
- vapor
- oil side
- low side
- liquid
8: R-22 falls under which safety classification?
- B-2
- A-2
- A-1
- B-1
9: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 25
- 66
11: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- 0F-38F
- 30F to 50F
- -40F to 0F
12: The proper location for an oil separator is between the
- receiver and metering device
- compressor and condenser
- condenser and receiver
- evaporator and compressor
13: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
14: While the system is operating, the discharge line should be
- room temperature
- at the same temperature as the crankcase
- too hot to hold by hand
- 10-15F warmer than ambient
15: It takes how many BTU/hr to melt one pound of ice at 32F
- 970
- 212
- 144
- 180
16: Which refrigerant class listed below is the most flammable?
- C3
- A3
- A2
- B2
17: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 2%
- 4%
- 25%
- 1%
18: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 2 months
- 1 week
- 30 days
- 14 days
19: Capacitors are rated in
- kelvins
- micro-farads
- volt - amperes
- megaohms
20: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
- You can't change lubricants.
- Place sign, check for leaks, insulate
21: What measures gas pressure?
- Manometer
- Hydrometer
- Barometer
- Hygrometer
22: A split-phase motor has a ______ winding and a ____ winding
- start, common
- duel-run, duel-start
- run, start
- run, common
23: Each machinery room shall contain
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- high and low pressure controls
24: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
25: Which occupancy can ammonia be used in?
- commercial
- depends on the quantity of freon
- industrial
- redifential