36 review

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

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-6

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 ____ sides of the house.

• north and east
• east and west
• north and south
• south and west

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 ____.

• 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 slant coil is at an angle more than 60°

In reciprocating compressors used in air conditioning, the motor is mainly cooled by ____.

• air over the shell of the assembly

• discharge gas from the compressor

• suction gas returning to the compressor

• Both a and c.

A dirty condenser coil can lead to ____.

• increased efficiency

• reduced efficiency

• reduced head pressure

• increased subcooling

Tags

NGSS.MS-PS3-3

High-efficiency condensers ____.

• can withstand higher pressures than standard condensers

• have more surface area than standard condensers

• have stainless steel coils

• are located in separate cabinets

Tags

NGSS.MS-PS3-3

When exposed to salt air, ____ should be used for the screws to secure the sheet metal of cabinets of air conditioning equipment.

• copper

• stainless steel

• aluminum

• galvanized

The package air-conditioning system is ____ than the split system because it is completely factory assembled and charged with refrigerant.

• slightly more efficient
• more efficient

• less efficient

• slightly less efficient

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS3-3

NGSS.MS-PS3-4

On a package air-conditioning system, which refrigerant lines must be field-installed?

• the liquid line

• liquid and suction line

• suction line

• no lines need to be installed