Topics: All categories in the pool
1: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
- At least 25' above grade
2: Lithium-bromide, Li-Br, is best characterized as a
- sand
- soil
- salt
- sugar
3: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
4: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
5: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
6: Control systems can be classified by
- source of power
- economy of operation
- tonnage of system
- safety
7: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- 2.5 times the design pressure
- the aggregate of the high side and low side
- the low side
- the high side
8: R-22 falls under which safety classification?
- B-2
- B-1
- A-2
- A-1
9: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
10: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- sensible heat
- lost heat
- latent heat
11: The absorber shell contains the
- condenser and the absorber
- condenser, the evaporator, and the generator
- condenser and the generator
- evaporator and the absorber
12: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- OSHA approved
- Locked doors
- Well-lit exit signs
13: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
14: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- reduce friction loss to the flow of refrigerant
- store excess refrigerant from the reciver
- filter out impurities from the system
15: 1 Watt = ______ BTU's?
- 12
- 4.482
- 7.216
- 3.412
16: Each machinery room shall contain
- 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
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
17: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there is a space 6' or more above it
- When its white
- When it's used as part of a supply or return air system
- When there are sprinklers above
18: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 50
- 25
- 22
19: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000
20: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or less
- 3 cubic feet or more
- 15 cubic feet or more
21: A mercury bulb controller is not recommended for
- line or low voltage use
- line voltage use
- low voltage use
- use where vibration is severe
22: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-volumetric displacement compressor
- neutral chamber-type compressor
- non-positive displacement compressor
- negative displacement compressor
23: Watt's Law indicates Volts X Amps = _________.
- Resistance
- Watts
- Ohms
- Current
24: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more diluted
- The Li-Br solution will become more concentrated
- Rust can form
- System operating pressure will drop
25: How many BTU's is produced by one watt of energy
- 2.57
- 1
- 3.41
- 3.00