Unit 35

78% nitrogen and 21% oxygen

Air is primarily made up of

75° at 50% relative humidity

According to the summer, comfort short, people would generally be comfortable when exposed to which of the following sets of conditions

70f @ 50% relative humidity

According to the winter comfort chart people generally be comfortable when exposed to which of the following sets of conditions

Saturated

Air that contains all of the moisture that it can hold is referred to as being

0.075 lb/ft3

At standard atmospheric pressure air has a density of

Cooler than the airs dewpoint temperature

Condensate dripping from an air conditioning system is an indication that the evaporator coil temperature is

67%

If an air sample hold, 60 greens of moisture( per pound) and has the ability to hold a maximum of 90 grains of moisture. What is the relative humidity of the air sample?

Wet bulb temperature

If only the absolute humidity of an air samples known which of the following values can be determined from the psychrometric chart?

2ft3/lb

If the density of a gas is 0.5lb/ft3, what is its specific volume

15°F

If the drywall temperature is 75°F and the wet bulb temperature is 60°F the wet bulb depression is

Perspiration will form to cool the body

If the human body is exposed to Barry, warm temperatures, which of the following is true

The absolute humidity drops

In a cooling only process, all of the following are true, except

dew point temperature

In order for an evaporator to remove moisture from the airstream, passing through it, the evaporator coil must be at a temperature that is lower than the airs

Increasing the relative humidity

In the winter, lower room temperatures can be off set by

1

Multiplying the density of a gas, any specific volume together we'll always produce a resort equal to

Enthalpy and wet bulb temperature

Of the following sets of your properties, which two can be identified by following the same line

Dry bulb temperature

On the psychrometric chart, the scale along the bottom of the chart represents

Psychrometer

Relative humidity is measured using which of the following instruments

Condensation

The body gives off heat in all of the following ways, except

Superheated gases

The nitrogen and oxygen in our air are classified as

Combination of latin heat and sensible heat

The term enthalpy applies to

Infiltrated

The term used to describe the random air that leaks into a structure is

60°F

What is the dewpoint temperature of a 75°F air sample with a relative humidity of 60%

QT=QS+QL

Which of the following is a correct formula for total heat

The wet bulb temperature reading can be equal to the dry bulb temperature reading

Which of the following is true regarding wet bulb and dry bulb temperature

The relative humidity will drop in the absolute humidity will remain the same

Which of the following statements is true regarding the heating of an air sample?

BTU/lb

Enthalpy is Express in which of the following units