Topics: All categories in the pool
1: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- one ton of cooling
- two tons of cooling
- three tons of cooling
2: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Approved by the installing contractor
3: 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
4: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
- Ducted and sealed
5: Ammonia systems use ____ pressure to adjust oil pressure
- air
- liquid
- stream
- discharge
6: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
7: All low-pressure chillers use which type of compressor?
- Reciprocating
- Rotary
- Scroll
- Centrifugal
8: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's a non-flammable refrigerant
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
9: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
10: A thermometer inside a duct measures ____ heat.
- latent
- specific
- sensible
- hidden
11: When an electronic bridge is in balance the bridge output will be
- 1 volt
- 15 volts
- 0 volts
- .01 volts
12: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
13: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- PVC
- Stainless steel
14: What does safe access mean?
- OSHA approved
- A clear unobstructed path to the equipment and controls
- Locked doors
- Well-lit exit signs
15: A relief valve discharge capacity is rated in
- PSIA
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
- PSIG
16: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Certified
- Insulated and installed in a pipe duct (Encased)
- Classifed
17: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 25'
- 15'
18: A water regulating valve opens when
- the compressor is on
- when the power is on
- when the power is on there is an overcharge of refrigerant
- the head pressure rises
19: Where a refrigeration or air conditioning system is installed,
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- A field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressuers
20: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
21: A low oil switch is typically
- manual reset
- automatic reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
22: The main purpose of the accumulator is to
- store liquid refrigerant
- provide space for the accumulation of oil and containminants
- provide space for vapor to accumulate
- prevent liquid slugs at the compressor
23: A halide torch is most useful with a freon compression system
- to release a sticking valve
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
24: On a large centrifugal system, what meters the flow to the evaporator?
- TXV
- Cap tube.
- Low side float
- High side float
25: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct