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Psychrometrics Quiz Questions Answers 4: HVAC Basics
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Question 1 of 12
1. Question
1 pointsIn Psychrometric char, lines of _____ run diagonally downward from left to right across the chart.
Correct
Incorrect
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Question 2 of 12
2. Question
1 points______ It is expressed in Btu per pound of dry air:
Correct
The enthalpy of moist air is the total heat content of a mixture of dry air and water vapor. It is expressed in British thermal units (Btu) per pound of dry air.
Incorrect
The enthalpy of moist air is the total heat content of a mixture of dry air and water vapor. It is expressed in British thermal units (Btu) per pound of dry air.
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Question 3 of 12
3. Question
1 pointsThe air mixture calculations are performed accurately on which of the following:
Correct
In general, mass-basis calculations are more accurate than volume-basis calculations. This is because the mass of a substance is constant, while the volume of a substance can change with temperature and pressure.
Incorrect
In general, mass-basis calculations are more accurate than volume-basis calculations. This is because the mass of a substance is constant, while the volume of a substance can change with temperature and pressure.
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Question 4 of 12
4. Question
1 pointsAir can gain heat with which of the following:
Correct
When air temperature increases, the molecules in the air move faster and collide with each other more often. This creates more heat energy. When air moisture content increases, the water vapor molecules in the air also move faster and collide with each other more often. This also creates more heat energy.
Incorrect
When air temperature increases, the molecules in the air move faster and collide with each other more often. This creates more heat energy. When air moisture content increases, the water vapor molecules in the air also move faster and collide with each other more often. This also creates more heat energy.
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Question 5 of 12
5. Question
1 pointsAt cold temperatures, air can hold very little water:
Correct
warmer air can hold more water vapor than cooler air. Molecules in warm air have more energy and can therefore hold more water vapor.
Incorrect
warmer air can hold more water vapor than cooler air. Molecules in warm air have more energy and can therefore hold more water vapor.
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Question 6 of 12
6. Question
1 pointsWet bulb temperature _______ as rate of evaporation of water from the wick
increases.Correct
As the water on the wick evaporates, it absorbs heat from the thermometer, causing the temperature to drop.
Incorrect
As the water on the wick evaporates, it absorbs heat from the thermometer, causing the temperature to drop.
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Question 7 of 12
7. Question
1 pointsMaximum amount of water vapor air can hold _____ with temperature:
Correct
As temperature increases, air molecules gain kinetic energy which increases their ability to hold water vapor
Incorrect
As temperature increases, air molecules gain kinetic energy which increases their ability to hold water vapor
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Question 8 of 12
8. Question
1 pointsThe greater the wet bulb or dew point depression, ______ will be Relative humidity:
Correct
The wet-bulb depression is a measure of the humidity of the air. It is the difference between the wet-bulb temperature and the dry-bulb temperature. The higher the humidity, the closer the wet-bulb temperature will be to the dry-bulb temperature. Greater the wet-bulb depression lower will be the Relative Humidity
Incorrect
The wet-bulb depression is a measure of the humidity of the air. It is the difference between the wet-bulb temperature and the dry-bulb temperature. The higher the humidity, the closer the wet-bulb temperature will be to the dry-bulb temperature. Greater the wet-bulb depression lower will be the Relative Humidity
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Question 9 of 12
9. Question
1 pointsHigher the dew point, _____ will be the water content of air:
Correct
Yes, the dew point is the temperature at which the air becomes saturated with water vapor. When the dew point is high, it means that the air is holding a lot of water vapor.
Incorrect
Yes, the dew point is the temperature at which the air becomes saturated with water vapor. When the dew point is high, it means that the air is holding a lot of water vapor.
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Question 10 of 12
10. Question
1 points10oF rise in air temperature can decrease relative humidity by approximately ______ :
Correct
A 10°F rise in air temperature can decrease relative humidity by 5 to 10%. This is because the amount of water vapor that air can hold increases with temperature.
Incorrect
A 10°F rise in air temperature can decrease relative humidity by 5 to 10%. This is because the amount of water vapor that air can hold increases with temperature.
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Question 11 of 12
11. Question
1 pointsIn Psychrometric chart specific volume is indicated by which of the following:
Correct
Incorrect
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Question 12 of 12
12. Question
1 pointsWhen dry bulb temperature is equal to wet bulb temperature, the evaporation rate will be:
Correct
When the air is saturated dry bulb temperature is equal to the wet bulb temperature. , At this point, air cannot absorb any more water vapor, and therefore, evaporation cannot occur.
Incorrect
When the air is saturated dry bulb temperature is equal to the wet bulb temperature. , At this point, air cannot absorb any more water vapor, and therefore, evaporation cannot occur.