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Absa 4b Final Exam, Practice Exam And Study Guide (All In One
Document) Newest 2026/2027|| Sure Pass!!!
Absolute or specific humidity is
a) the actual mass of moisture present in a specific amount
of air
b) the maximum mass of moisture that a specific amount of
air can hold
c) the ratio of the mass of moisture contained in a specific
amount of air to the maximum amount of moisture this
specific amount of air can contain
d) the mass of moistrue present in a specific amount of air
at that absolute temperature
e) a specific amount of air saturated with moisture - ANSWER-A
Relative humidity is
a) the actual mass of moisture present in a specific amount
of air
b) the ratio of the mass of moisture contained in a specific
amount of air to the maximum amount of moisture this
specific amount of air can contain
c) the maximum mass of moisture that a specific amount of
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air can contain
d) the ratio of the mass of air contained in a specific
amount of moisture to the maximum amount of air this
specific amount of moisture can contain
e) a specific amount of air saturated with moisture - ANSWER-B
Dewpoint can be best defined as
a) the absolute temperature at which air, upon heating, will
evaporate moisture
b) the absolute temperature at which air, upon cooling, will
vaporize moisture
c) the temperature that air will begin to evaporate moisture
d) the atmospheric pressure at which air will condense
moisture
e) the temperature at which air, upon cooling, becomes
saturated and will begin to condense out water vapour
below this temperature - ANSWER-E
Dry-bulb temperature is
a) the absolute temperature corresponding to the atmospheric
pressure
b) the dewpoint temperature
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c) not required to find the relative humidity
d) the temperature of the air measured with an ordinary
thermometer
e) the same as the wet-bulb temperature if the relative
humidity is less than 100% - ANSWER-D
Wet-bulb temperature is
a) the temperature indicated by a thermometer having its
bulb covered by a water-wetted wick or cloth and the wet
bulb is exposed to a rapidly moving stream of air
b) the same as the dry-bulb temperature if the relative
humidity is less than 100%
c) the dewpoint temperature
d) always less than the dry bulb temperature
e) not required to find the relative humidity - ANSWER-A
What is wet-bulb depression?
a) lowering of the thermometer bulb into water
b) sum of the wet-bulb temperature and the dry-bulb
temperature
c) decrease in relative humidity
d) difference between the dry-bulb temperature and the
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wet-bulb temperature
e) decrease in the absolute humidity - ANSWER-D
Psychrometers are
a) instruments used to determine the purity of air
b) meters used to measure air speed
c) meters used to measure the density of air
d) instruments used to measure atmospheric pressure
e) instruments used to determine the relative humidity of
air - ANSWER-E
Which of the following instruments use a battery-operated fan
to draw air over the thermometer bulbs?
a) hydrometer
b) aspirating psychrometer
c) sling psychrometer
d) dry psychrometer
e) potentiometer - ANSWER-B
The specific volume of air is
a) the volume of 1 kg of air at atmospheric pressure
expressed in cubic centimetres
b) the volume of 1 gram of air at atmospheric pressure
Absa 4b Final Exam, Practice Exam And Study Guide (All In One
Document) Newest 2026/2027|| Sure Pass!!!
Absolute or specific humidity is
a) the actual mass of moisture present in a specific amount
of air
b) the maximum mass of moisture that a specific amount of
air can hold
c) the ratio of the mass of moisture contained in a specific
amount of air to the maximum amount of moisture this
specific amount of air can contain
d) the mass of moistrue present in a specific amount of air
at that absolute temperature
e) a specific amount of air saturated with moisture - ANSWER-A
Relative humidity is
a) the actual mass of moisture present in a specific amount
of air
b) the ratio of the mass of moisture contained in a specific
amount of air to the maximum amount of moisture this
specific amount of air can contain
c) the maximum mass of moisture that a specific amount of
,2|Page
air can contain
d) the ratio of the mass of air contained in a specific
amount of moisture to the maximum amount of air this
specific amount of moisture can contain
e) a specific amount of air saturated with moisture - ANSWER-B
Dewpoint can be best defined as
a) the absolute temperature at which air, upon heating, will
evaporate moisture
b) the absolute temperature at which air, upon cooling, will
vaporize moisture
c) the temperature that air will begin to evaporate moisture
d) the atmospheric pressure at which air will condense
moisture
e) the temperature at which air, upon cooling, becomes
saturated and will begin to condense out water vapour
below this temperature - ANSWER-E
Dry-bulb temperature is
a) the absolute temperature corresponding to the atmospheric
pressure
b) the dewpoint temperature
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c) not required to find the relative humidity
d) the temperature of the air measured with an ordinary
thermometer
e) the same as the wet-bulb temperature if the relative
humidity is less than 100% - ANSWER-D
Wet-bulb temperature is
a) the temperature indicated by a thermometer having its
bulb covered by a water-wetted wick or cloth and the wet
bulb is exposed to a rapidly moving stream of air
b) the same as the dry-bulb temperature if the relative
humidity is less than 100%
c) the dewpoint temperature
d) always less than the dry bulb temperature
e) not required to find the relative humidity - ANSWER-A
What is wet-bulb depression?
a) lowering of the thermometer bulb into water
b) sum of the wet-bulb temperature and the dry-bulb
temperature
c) decrease in relative humidity
d) difference between the dry-bulb temperature and the
, 4|Page
wet-bulb temperature
e) decrease in the absolute humidity - ANSWER-D
Psychrometers are
a) instruments used to determine the purity of air
b) meters used to measure air speed
c) meters used to measure the density of air
d) instruments used to measure atmospheric pressure
e) instruments used to determine the relative humidity of
air - ANSWER-E
Which of the following instruments use a battery-operated fan
to draw air over the thermometer bulbs?
a) hydrometer
b) aspirating psychrometer
c) sling psychrometer
d) dry psychrometer
e) potentiometer - ANSWER-B
The specific volume of air is
a) the volume of 1 kg of air at atmospheric pressure
expressed in cubic centimetres
b) the volume of 1 gram of air at atmospheric pressure
