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HVAC Basics: Psychrometrics Quiz Questions 3
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Question 1 of 15
1. Question
1 pointsA psychrometric chart presents ______ of moist air in a graphical form
Correct
A psychrometric chart presents the physical and thermal properties of moist air in a graphical form. It helps in understanding the behavior of moist air. Psychrometric charts are used in a variety of applications such as HVAC design, meteorology, and industrial process control.
Incorrect
A psychrometric chart presents the physical and thermal properties of moist air in a graphical form. It helps in understanding the behavior of moist air. Psychrometric charts are used in a variety of applications such as HVAC design, meteorology, and industrial process control.
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Question 2 of 15
2. Question
1 pointsHigher the temperature of the air, _____ will be water vapor containing capacity of the air:
Correct
As the air temperature increases, the air molecules gain energy and move faster, allowing the air to hold more water vapor.
Incorrect
As the air temperature increases, the air molecules gain energy and move faster, allowing the air to hold more water vapor.
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Question 3 of 15
3. Question
1 pointsThe comfort range of temperature varies between ______ dry bulb temperatures
Correct
Incorrect
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Question 4 of 15
4. Question
1 pointsWhich of the thermal property indicating the quantity of heat that the air above an arbitrary
datum, in Btu per pound of dry air:Correct
Enthalpy is a measure of the total heat content of a substance, including the sensible heat and the latent heat.
Incorrect
Enthalpy is a measure of the total heat content of a substance, including the sensible heat and the latent heat.
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Question 5 of 15
5. Question
1 pointsWhich of the following is the heat content causing an increase in dry-bulb temperature:
Correct
The sensible heat is the heat content causing an increase in dry-bulb temperature. Sensible heat is the heat that is transferred to or from a substance without causing a change in its phase.
Incorrect
The sensible heat is the heat content causing an increase in dry-bulb temperature. Sensible heat is the heat that is transferred to or from a substance without causing a change in its phase.
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Question 6 of 15
6. Question
1 pointsVertical lines in Psychromteric charts indicate constant ______ in °C or °F:
Correct
Vertical lines that are drawn parallel to Y axis in the psychrometric chart represent dry bulb temperature lines
Incorrect
Vertical lines that are drawn parallel to Y axis in the psychrometric chart represent dry bulb temperature lines
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Question 7 of 15
7. Question
1 pointsLatent heat can be associated with which of the following:
Correct
Yes, latent heat can be associated with wet heat. Latent heat is the heat that is required to change the phase of a substance without a change in temperature.
Incorrect
Yes, latent heat can be associated with wet heat. Latent heat is the heat that is required to change the phase of a substance without a change in temperature.
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Question 8 of 15
8. Question
1 pointsThe addition or removal of heat to the air without any change in the moisture content results in change in which of the following:
Correct
Dry bulb temperature thermometer measures the temperature of air without taking into account the moisture content of the air.
Incorrect
Dry bulb temperature thermometer measures the temperature of air without taking into account the moisture content of the air.
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Question 9 of 15
9. Question
1 pointsAs the relative humidity of the air decreases, the temperature of the air _____:
Correct
The temperature of the air does not change as the relative humidity of the air increases or decreases.
Incorrect
The temperature of the air does not change as the relative humidity of the air increases or decreases.
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Question 10 of 15
10. Question
1 pointsWhich of the following air has higher specific volume:
Correct
Yes, Warmer air molecules have more energy and move faster than cooler air molecules. This causes the warmer air molecules to spread out more which results in a higher specific volume.
Incorrect
Yes, Warmer air molecules have more energy and move faster than cooler air molecules. This causes the warmer air molecules to spread out more which results in a higher specific volume.
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Question 11 of 15
11. Question
1 pointsCondensation occurs on surfaces ____ the dew point temperature:
Correct
Dew point temperature is the temperature at which the air is saturated with water vapor. When the air temperature falls below the dew point temperature, the water vapor in the air will condense on any available surface
Incorrect
Dew point temperature is the temperature at which the air is saturated with water vapor. When the air temperature falls below the dew point temperature, the water vapor in the air will condense on any available surface
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Question 12 of 15
12. Question
1 pointsIn the psychrometry chart, at any point on the saturation curve dry bulb temperatures are ___________ to wet bulb temperatures
Correct
Incorrect
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Question 13 of 15
13. Question
1 pointsSling psychrometer is used to measure which of the following temperature(s):
Correct
A sling psychrometer is a device used to measure the relative humidity of air. It consists of two thermometers measuring wet-bulb and dry-bulb temperatures.
Incorrect
A sling psychrometer is a device used to measure the relative humidity of air. It consists of two thermometers measuring wet-bulb and dry-bulb temperatures.
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Question 14 of 15
14. Question
1 pointsThe wet-bulb temperature can never be higher than the dry-bulb temperature.
Correct
Dry bulb temperature measures surrounding air. In wet bulb thermometer, the bulb is covered with a wet wick. When water on the wick evaporates, it absorbs heat from the thermometer, causing the temperature to drop.
Incorrect
Dry bulb temperature measures surrounding air. In wet bulb thermometer, the bulb is covered with a wet wick. When water on the wick evaporates, it absorbs heat from the thermometer, causing the temperature to drop.
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Question 15 of 15
15. Question
1 pointsAs the amount of moisture suspended in the air _____, the wet-bulb depression decreases
Correct
Wet-bulb depression is the difference between the wet-bulb temperature and the dry-bulb temperature. When there is more moisture in the air, it is harder for the water on the wick to evaporate. This means that less heat is absorbed from the thermometer, and the wet-bulb temperature will be closer to the dry-bulb temperature.
Incorrect
Wet-bulb depression is the difference between the wet-bulb temperature and the dry-bulb temperature. When there is more moisture in the air, it is harder for the water on the wick to evaporate. This means that less heat is absorbed from the thermometer, and the wet-bulb temperature will be closer to the dry-bulb temperature.