The total heat content of infiltrated air of the same dry-bulb temperature may vary from one part of the country to another because of the difference in __________.
Solar load
Sensible heat
Humidity
Convection currents
A homeowner plans to build a house out in Las Vegas, Nevada, in the middle of the desert. It would be in his/her best interest to lower the "solar load," to locate most of the windows on the __________.
west side of the house
east side of the house
north side of the house
south side of the house
The solar load on a structure is the heat gain resulting from the __________.
heat from the surrounding air conducted through the materials of the structure
air infiltration
heat from the radiation from the sun
dry-bulb inside the structure
More than one evaporator coil circuit is used when __________.
a slant coil is at an angle more than 60°
the evaporator is located outside the conditioned area
there would be excessive refrigerant pressure drop in the coil circuit
a distributor would not be practical
A popular material combination used in air conditioning evaporators and condensers is __________.
copper tube-copper fin
copper tube-stainless steel fin
aluminum tube-aluminum fin
copper tube-aluminum fin
In reciprocating and scroll type motor-compressor assemblies, the motor is cooled by __________.
liquid refrigerant by-passed from the liquid line
discharge gas from the compressor
suction gas returning to the compressor
air over the shell of the assembly
In rotary type motor-compressor assemblies, the motor is cooled by ____.
A dirty condenser coil can lead to ____.
increased efficiency
reduced efficiency
increased heat transfer
increased subcooling
High efficiency condensers ____.
are located in separate cabinets
have stainless steel coils
have more surface area than standard condensers
can withstand higher pressures than standard condensers
The package air-conditioning system is _____ than the split system because it is completely factory assembled and charged with refrigerant.
less efficient
slightly less efficient
slightly quieter
more efficient
On a package air conditioning system, which refrigerant lines must be field installed?
discharge and suction
discharge and liquid
liquid and suction
No lines need to be installed
On a split air conditioning system with a remote condensing unit, which refrigerant lines must be field installed?
The air temperature of the air off an evaporative cooler is ____.
cooler than the entering air
made up of sensible heat only
a constant 32 degrees
the same as the entering air
The humidity difference in the 2 different locations (different parts of the country) must be accounted for in the conditioning equipment choice.
The all-aluminum coil has a higher heat transfer rate than the standard copper tube-aluminum fin coil.
Leaks in all-aluminum coils are easier to repair than the standard copper tube-aluminum fin coil.
Equipment will perform at it’s best efficiency when running at full load.
If a residential split air conditioning system has a compressor equipped with a start capacitor and relay, it is probably using a thermostatic expansion valve as a metering device.
The supply duct portion of an air handling system needs to be insulated when run through an unconditioned space.
The return duct portion of an air handling system never needs to be insulated.
