FINALS

Question 1

Study of the properties of mixture of air and water vapor

Answer 1

Psychometry

Question 2

Mixture of air and water vapor

Answer 2

Atmospheric air

Question 3

Atmospheric air with all the water vapor (and contaminants) removed

Answer 3

Dry air

Question 4

Binary (two-component) mixture of dry air and water vapor

Answer 4

Moist air

Question 5

a state of neutral equilibrium between moist air and the condensed water phase (liquid or
solid

Question 6

measure of the capacity of air to absorb moisture

Answer 6

Relative humidity, %

Question 7

the ratio of the mole fraction of water vapor xw in moist air to the mole fraction of water
vapor xws in saturated air at the same temperature and pressure

Answer 7

Relative humidity, %

Question 8

the moisture content or mixing ratio of a given moist air sample

Answer 8

Humidity ratio W

Question 9

ratio of the mass of water vapor to the mass of dry air in a given air-vapor mixture

Answer 9

Humidity ratio W

Question 10

Eq of humidity ratio

Answer 10

…

Question 11

the temperature of the air as measured by an ordinary dry bulb thermometer, or by using
some other temperature sensing device

Answer 11

Dry-bulb temperature Tdb -

Question 12

the temperature at which water (liquid or solid), by evaporating into moist air at dry
bulb temperature Tdb and humidity ratio W, can bring air to saturation adiabatically at the
same temperature t* while total pressure p is constant

Answer 12

Thermodynamic wet-bulb temperature t*

Question 13

Unique property of a given moist air sample independent of
measurement techniques

Answer 13

Thermodynamic wet-bulb temperature t*

Question 14

approximated, dependent on other factors: distilled water, air movement, shield, cotton/cloth used

Answer 14

Psychrometric wet-bulb temperature Twb

Question 15

equilibrium temp reached when the wet bulb is placed in an
airstream and water evaporates

Answer 15

Psychrometric wet-bulb temperature Twb

Question 16

difference between dry-bulb and wet-bulb temperatures

Answer 16

Wet-bulb depression

Question 17

depends on the degree of “dryness or wetness” of the air

Answer 17

Wet-bulb depression

Question 18

the temperature of moist air saturated at pressure p, with the same humidity ratio W
as that of the given sample of moist air

Answer 18

Dew-point temperature Td

Question 19

the temperature at which the vapor in the air begins to condense

Answer 19

Dew-point temperature Td

Question 20

can be obtained by cooling the air-vapor mixture under constant pressure

Answer 20

Dew-point temperature Td

Question 21

the sum of the individual partial enthalpies of the components (air and water

Answer 21

Enthalpy of air-vapor mixture

Question 22

specific volume v of a moist air mixture

Answer 22

v = V/Ma = V/(28.966na)

Question 23

Graphical representation of the thermodynamic properties of moist air

Answer 23

Psychrometric Chart

Question 24

straight, not precisely parallel to each other, and inclined slightly from the vertical
position

Answer 24

Dry-bulb temperature lines
25.

Question 25

oblique and in a slightly different direction from enthalpy lines not precisely parallel to
enthalpy line

Answer 25

Thermodynamic wet-bulb temperature lines
26.

Question 26

straight but are not precisely parallel to each other

Answer 26

Specific volume lines
30.

Question 27

When moist air is heated or cooled without a gain or loss of moisture

Answer 27

Sensible heating

Question 28

When moist air is cooled without a gain or loss of moisture

Answer 28

Sensible cooling

Question 29

Water vapor is added to moist air

Answer 29

Humidification

Question 30

Water vapor is absorbed from the moist air

Answer 30

. Dehumidification

Question 31

occurs when moist air is cooled to a temperature below its initial

Answer 31

Moisture condensation
Cooling and Dehumidificatio

Question 32

tendency for moisture to permeate through the wall due to pressure difference until
pressure equalizes

Answer 32

Moisture transmission

Question 33

Material used to install on, or near, the warm or humid Side of an enclosed structure.

Answer 33

Vapor barriers

Question 34

a high-quality non-combustible bonded Rockwool with a vertical fiber structure, w/c
ensures a high insulation value, excellent fire resistance and

Answer 34

Mineral fiber

Question 35

water repellent - free of (H)CFCs
- fully recyclable solution for wall and ceiling applications in hygienic chill and ambient
environments where internal temperatures

Answer 35

Rockwool -

Question 36

Polyisocyanurate (PIR)

Answer 36

• the most efficient insulating materials available