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Air Conditioning Quiz Questions Answers 5
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Question 1 of 15
1. Question
1 pointsAs the temperature of the air increases, the amount of water vapor needed for the saturation _____:
Correct
Molecules in the air move faster as the temperature increases, and they can hold more water vapor
Incorrect
Molecules in the air move faster as the temperature increases, and they can hold more water vapor
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Question 2 of 15
2. Question
1 pointsCooling of air without any condensation of moisture is purely sensible cooling
Correct
Sensible cooling is the process of removing heat from air without changing its moisture content.
Incorrect
Sensible cooling is the process of removing heat from air without changing its moisture content.
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Question 3 of 15
3. Question
1 pointsThe larger the temperature difference between the evaporator surface of an air conditioning system and the air, the ___ will be the amount of mositure removed:
Correct
The larger the temperature difference between the evaporator and the air, the more heat is absorbed by the refrigerant. This means that more moisture can be removed from the air.
Incorrect
The larger the temperature difference between the evaporator and the air, the more heat is absorbed by the refrigerant. This means that more moisture can be removed from the air.
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Question 4 of 15
4. Question
1 pointsThe load on the condenser will decrease with an increase in the compression ratio:
Correct
Higher compression ratio will result in a higher discharge temperature, which requires a larger condenser to dissipate the heat (load on the condenser increases).
Incorrect
Higher compression ratio will result in a higher discharge temperature, which requires a larger condenser to dissipate the heat (load on the condenser increases).
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Question 5 of 15
5. Question
1 pointsHeat rejection factor of the plant varies with the:
Correct
The heat rejection factor is an important factor in the design and operation of refrigeration plants. The heat rejection factor depends on the evaporator temperature (the lower the evaporator temperature, the more heat is rejected by the plant), condenser temperature (the higher the condenser temperature, the less heat is rejected by the plant), compressor efficiency (A more efficient compressor will reject more heat), compressor fan speed, compressor surface area, and refrigerant type
Incorrect
The heat rejection factor is an important factor in the design and operation of refrigeration plants. The heat rejection factor depends on the evaporator temperature (the lower the evaporator temperature, the more heat is rejected by the plant), condenser temperature (the higher the condenser temperature, the less heat is rejected by the plant), compressor efficiency (A more efficient compressor will reject more heat), compressor fan speed, compressor surface area, and refrigerant type
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Question 6 of 15
6. Question
1 pointsForced draft fans are located at the _____ of the tower for the movement of air through the cooling tower:
Correct
Forced draft fans are commonly used in the bottom or lower section of a cooling tower. These fans are responsible for drawing or forcing ambient air into the cooling tower, facilitating the cooling process.
Incorrect
Forced draft fans are commonly used in the bottom or lower section of a cooling tower. These fans are responsible for drawing or forcing ambient air into the cooling tower, facilitating the cooling process.
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Question 7 of 15
7. Question
1 pointsThe density of the water vapor is ____ compared to liquid water
Correct
The density of water vapor is extremely lower than that of liquid water. When water undergoes a phase change from liquid to gas (vapor) through evaporation, its density decreases. The decrease in density occurs because the water molecules in the vapor phase are more spread out compared to when they are in the liquid phase.
Incorrect
The density of water vapor is extremely lower than that of liquid water. When water undergoes a phase change from liquid to gas (vapor) through evaporation, its density decreases. The decrease in density occurs because the water molecules in the vapor phase are more spread out compared to when they are in the liquid phase.
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Question 8 of 15
8. Question
1 pointsIn confined spaces, Oxygen levels below _____ can be dangerous
Correct
Oxygen levels below 19.5% can be dangerous for human health. The normal atmospheric air we breathe typically contains about 20.9% oxygen. When the oxygen concentration in the air drops below 19.5%, it can lead to oxygen deprivation or hypoxia, which can have various adverse effects on the body.
Incorrect
Oxygen levels below 19.5% can be dangerous for human health. The normal atmospheric air we breathe typically contains about 20.9% oxygen. When the oxygen concentration in the air drops below 19.5%, it can lead to oxygen deprivation or hypoxia, which can have various adverse effects on the body.
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Question 9 of 15
9. Question
1 pointsThe purpose of reheat coils in the air conditioning system is to _____ the relative humidity in the room when the sensible load comes down:
Correct
When the sensible load comes down, the air conditioning system is no longer able to remove as much moisture from the air. Reheat coils help to increase the temperature of the air, which helps to reduce the amount of moisture that can be held in the air.
Incorrect
When the sensible load comes down, the air conditioning system is no longer able to remove as much moisture from the air. Reheat coils help to increase the temperature of the air, which helps to reduce the amount of moisture that can be held in the air.
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Question 10 of 15
10. Question
1 pointsEvaporative cooling is the process by which air is subjected to a spray of recirculated water:
Correct
Evaporative cooling is a process that uses water to cool air. When water evaporates, it absorbs heat from the surrounding air.
Incorrect
Evaporative cooling is a process that uses water to cool air. When water evaporates, it absorbs heat from the surrounding air.
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Question 11 of 15
11. Question
1 pointsThe velocity range of the air required for comfortable cooling purposes:
Correct
Incorrect
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Question 12 of 15
12. Question
1 pointsUltraviolet air cleaner uses which of the following for producing ultraviolet waves:
Correct
Mercury vapor lamps emit ultraviolet light in the UV-C range, which is effective at killing bacteria and viruses.
Incorrect
Mercury vapor lamps emit ultraviolet light in the UV-C range, which is effective at killing bacteria and viruses.
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Question 13 of 15
13. Question
1 pointsWhich of the following is used to measure static pressure:
Correct
To measure static pressure, a manometer typically consists of a U-shaped tube partially filled with a liquid, such as water or mercury.
Incorrect
To measure static pressure, a manometer typically consists of a U-shaped tube partially filled with a liquid, such as water or mercury.
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Question 14 of 15
14. Question
1 pointsThe EPA suggests a minimum Air Changes per Hour (ACH) of ______ for residential homes as a guideline for providing adequate ventilation.
Correct
Incorrect
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Question 15 of 15
15. Question
1 pointsHeated air rise contributes to the temperature stratification in the upper part of the room:
Correct
This is because heated air is less dense than cold air, so it rises. temperature stratification can lead to insufficient air conditioning, discomfort, and poor air quality
Incorrect
This is because heated air is less dense than cold air, so it rises. temperature stratification can lead to insufficient air conditioning, discomfort, and poor air quality