Chapter 125

Question 1

Psychrometry is studying the behavior of:

Answer 1

air and water vapour

Question 2

Humidity is the term used to describe the presence of _______ in the air.

Answer 2

moisture

Question 3

Water vapour in the air is actually:

Answer 3

low pressure low temperature steam

Question 4

How can you explain the presence of water vapour in the atmosphere?

Answer 4

daltons law

Question 5

Absolute humidity is the actual mass of moisture present in a specific amount of _________.

Answer 5

air

Question 6

Absolute humidity is expressed in?

Answer 6

kilograms per kilogram of dry air

Question 7

Relative humidity is expressed as a ratio of the _________________contained in a given amount of air to the maximum amount of moisture the can contain at that ____________.

Answer 7

mass of moisture, given temperature

Question 8

psychrometers are instruments used to determine the relative humidity of ______.

Answer 8

air

Question 9

The heat content of air is called the?

Answer 9

enthalpy of the air

Question 10

The specific volume of air is the volume of _____ of air at ____________ expressed in cubic metres.

Answer 10

1k, atmospheric pressure

Question 11

Air is approximately what composition by volume?

Answer 11

21% oxygen 79% nitrogen

Question 12

Wet bulb depression is the difference between the _____ temperature and the ______ temperature

Answer 12

dry-bulb, wet bulb

Question 13

Air conditioning involves the control of four different components:

Answer 13

Air temperature, control of humidity, air circulation, and the removal of contaminants

Question 14

Dry bulb is the temperature of the air measured with?

Answer 14

an ordinary thermometer

Question 15

Dew point can be best defined as the temperature at which _____, upon cooling becomes ________ and will begin to _______ out water vapour below this temperature.

Answer 15

air, saturated, condense

Question 16

Dew point can be best defined as the temperature at which _____, upon cooling becomes ________ and will begin to _______ out water vapour below this temperature.

Answer 16

air, saturated, condense

Question 17

The temperature indicated by a thermoeter having its bulb covered by a water-wetted wick or cloth and the wet bulb is exposed to a rapidly moving air.

Answer 17

Wet-bulb tempurature

Question 18

The difference between the wet and dry bulb readings is called the?

Answer 18

wet bulb depression