The comfort of human beings is affected by the atmospheric conditions surrounding them. Which of the following is not an atmospheric condition which affects comfort?

The comfort of human beings is affected by the atmospheric conditions surrounding them. Which of the following is not an atmospheric condition which affects comfort?

a) Temperature
b) Relative humidity
c) Saturation temperature
d) Air movement
e) Air cleanliness







Answer: C

During sensible heating the dry-bulb temperature and the wet-bulb temperature are raised, and

During sensible heating the dry-bulb temperature and the wet-bulb temperature are raised, and

a) the dew point remains unchanged
b) the specific humidity is increased
c) the specific humidity is decreased
d) the dewpoint temperature increases
e) the dewpoint temperature decreases







Answer: A

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 25 degrees C.

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 25 degrees C.

a) 50%
b) 90%
c) 100%
d) 95%
e) 60%








Answer: C

Which of the following statements about cooling and dehumidification is false?

Which of the following statements about cooling and dehumidification is false?

a) Air washers are used to dehumidify air.
b) When air leaves the washer it will be close to 100% relative humidity.
c) The spray water carries off the latent heat of condensation of the water vapour in the air.
d) Dry bulb temperatures are increased.
e) Dewpoint temperatures are lowered.







Answer: D

The intersection between the line running vertically from the point on the dry-bulb scale and the downward diagonally running line from the wet-bulb scale is defined as

The intersection between the line running vertically from the point on the dry-bulb scale and the downward diagonally running line from the wet-bulb scale is defined as

a) the Dewpoint temperature
b) the partial pressure
c) the reference point
d) the specific volume
e) the relative humidity







Answer: C

Which of the following properties cannot be found on the psychrometric chart?

Which of the following properties cannot be found on the psychrometric chart?

a. The dew point temperature
b. The partial pressure
c. The specific humidity
d. The enthalpy
e. The relative humidity







Answer: B