Cooling practice questions

Question 1 of 10

The principle that hotter air is lighter than cooler air and will rise is called the:

• ADew point
• BLatent heat
• CStack effect
• DSensible load

Question 2 of 10

An evaporator coil should not be installed BEFORE a furnace combustion chamber because:

• AThe furnace fan cannot pull air through the coil
• BMoist air from the coil may damage the furnace
• CThe coil would be too far from the condenser
• DThe condensate trap would not drain from the coil in that position

Question 3 of 10

Air that a bathroom fan or clothes dryer mechanically removes from one location is called:

• AVentilation
• BExhaust
• CReturn air
• DInfiltration

Question 4 of 10

Which compressor type is at less risk from slugging?

• AReciprocating compressors
• BScroll compressors
• CRotary compressors
• DCentrifugal compressors

Question 5 of 10

A home inspector decodes a condenser serial number as 2019 and a furnace serial number as 2003. What is the correct conclusion?

• AOne of the two serial number readings must be wrong, since the condenser and furnace of a system are installed together
• BThe dates can legitimately differ, because condensers have a shorter service life and are frequently replaced first
• CThe furnace date governs, because the indoor equipment sets system age
• DThe system must have components from different manufacturers

Question 6 of 10

Temperature drop across the evaporator coil measures which load, and why does that matter in a humid climate?

• AThe latent load, so humid climates read higher
• BThe sensible load, so humid climates read lower because energy goes into condensing water vapor
• CBoth loads combined, so climate makes no difference
• DThe sensible load, so humid climates read higher because warm air holds more heat than cooler air does

Question 7 of 10

A home inspector in a humid climate observes water on the outside of an uninsulated primary condensate pipe that is otherwise intact. What explains the water?

• AThe pipe is leaking at a joint the home inspector cannot see
• BCondensate is cold as it leaves the coil, and the cold pipe creates condensation
• CThe pipe lacks the minimum 1/8 inch per foot of slope
• DThe pipe is connected downstream from a plumbing trap

Question 8 of 10

A home inspector observes an older analog thermostat mounted visibly out of level. What is the concern?

• AThe mercury vial can spill and release mercury into the room
• BThe thermostat operates inaccurately
• CThe bimetallic spring loses calibration permanently
• DLow voltage cable connections work loose over time

Question 9 of 10

A home inspector measures a flexible duct hung on supports 4 feet apart and finds 3 inches of sag between them. The sag is:

• AAcceptable, because it does not exceed 1/2 inch per foot
• BAcceptable, because the supports meet the 4 foot spacing
• CNot acceptable, because sag should not be more than 1/2 inch per foot
• DNot acceptable, because flexible duct should not sag at all between supports

Question 10 of 10

A return inlet should not be located in the same room as a fireplace or a draft-hood appliance within:

• A3 feet
• B6 feet
• C10 feet
• D15 feet