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Question 1 of 15
1. Question
1 points
Aspect ratio in rectangular duct should be kept within ______ :
Correct
It is to minimize frictional losses and ensure that the duct is easy to install. A duct with a higher aspect ratio will have more surface area, which will increase the frictional losses.
Incorrect
It is to minimize frictional losses and ensure that the duct is easy to install. A duct with a higher aspect ratio will have more surface area, which will increase the frictional losses.
Question 2 of 15
2. Question
1 points
Which of the following ducts with its high strength-to-weight ratio is suitable for distribution systems:
Correct
Round ducts are stronger than rectangular ducts of the same cross-sectional area, which makes them less likely to collapse under pressure. They are also more flexible, which makes them easier to install in tight spaces. Round ducts are also more efficient than rectangular ducts, as they have less surface area, which reduces frictional losses.
Incorrect
Round ducts are stronger than rectangular ducts of the same cross-sectional area, which makes them less likely to collapse under pressure. They are also more flexible, which makes them easier to install in tight spaces. Round ducts are also more efficient than rectangular ducts, as they have less surface area, which reduces frictional losses.
Question 3 of 15
3. Question
1 points
In the ducts, the pressure drop of the air is associated with which of the following:
Correct
Friction loss is the energy that is lost in friction as air flows through the duct. Dynamic loss is the energy that is lost as air flows through the duct due to turbulence or changes in size, shape, direction, or volume flow rate in a duct system.
Incorrect
Friction loss is the energy that is lost in friction as air flows through the duct. Dynamic loss is the energy that is lost as air flows through the duct due to turbulence or changes in size, shape, direction, or volume flow rate in a duct system.
Question 4 of 15
4. Question
1 points
In a dehumidifier or an air conditioning system, the removal of latent heat will removes the moisture and lower the temperature:
Correct
By removing the latent heat, the air is cooled, causing water vapor in the air to condense into liquid water. This condensed moisture is typically collected and drained away, resulting in a decrease in both the humidity and temperature of the air.
Incorrect
By removing the latent heat, the air is cooled, causing water vapor in the air to condense into liquid water. This condensed moisture is typically collected and drained away, resulting in a decrease in both the humidity and temperature of the air.
Question 5 of 15
5. Question
1 points
Fans in _____ are seldom used for ventilation purpose:
Correct
Fans in series are seldom used for ventilation purposes. This is because series fans create more airflow resistance, which can reduce the amount of air that is circulated. This can lead to poor ventilation and uncomfortable temperatures.
Incorrect
Fans in series are seldom used for ventilation purposes. This is because series fans create more airflow resistance, which can reduce the amount of air that is circulated. This can lead to poor ventilation and uncomfortable temperatures.
Question 6 of 15
6. Question
1 points
With the higher discharge pressure of the air conditioning system, compression ratio:
Correct
If the discharge pressure of an air conditioning system is too high it can be because of higher outdoor temperatures or because of refrigerant not flowing properly through the system. This results in more work on the compressor to pump the refrigerant through the system thereby increasing the compression ratio (ratio of the highest pressure in the system to the lowest pressure in the system).
Incorrect
If the discharge pressure of an air conditioning system is too high it can be because of higher outdoor temperatures or because of refrigerant not flowing properly through the system. This results in more work on the compressor to pump the refrigerant through the system thereby increasing the compression ratio (ratio of the highest pressure in the system to the lowest pressure in the system).
Question 7 of 15
7. Question
1 points
The quantity of air to be distributed to various rooms, wings or zones of the building should be in proportional to the load in the respective areas:
Correct
Incorrect
Question 8 of 15
8. Question
1 points
Comfort conditions are attained by merely controlling the temperature
Correct
controlling combination of temperature, relative humidity and air movement
Incorrect
controlling combination of temperature, relative humidity and air movement
Question 9 of 15
9. Question
1 points
Jet type of nozzles are used where the supply air from the diffuser has to travel a _____ distance to the occupied zone:
Correct
When the distance between the diffuser and the occupied zone is relatively short, jet nozzles can effectively direct the airflow without significant loss of momentum or diffusion.
Incorrect
When the distance between the diffuser and the occupied zone is relatively short, jet nozzles can effectively direct the airflow without significant loss of momentum or diffusion.
Question 10 of 15
10. Question
1 points
The aluminum fins are coated to ______ surface tension of the condensate water droplets:
Correct
The aluminum fins in an air conditioning system are coated to reduce the surface tension of the condensate water droplets thereby helping the air conditioning system to remove more heat from the air
Incorrect
The aluminum fins in an air conditioning system are coated to reduce the surface tension of the condensate water droplets thereby helping the air conditioning system to remove more heat from the air
Question 11 of 15
11. Question
1 points
Face and by-pass dampers in the AHU helps in controlling Relative Humidity:
Correct
By adjusting the position of the face dampers and bypass dampers, the amount of moisture removed/added to the air can be controlled.
Incorrect
By adjusting the position of the face dampers and bypass dampers, the amount of moisture removed/added to the air can be controlled.
Question 12 of 15
12. Question
1 points
In which of the following system there is no reduction in the power consumption by the fan even though the load on the system has come down:
Correct
This is because the fan (runs at the same speed) is set to deliver a constant volume of air regardless of the load.
Incorrect
This is because the fan (runs at the same speed) is set to deliver a constant volume of air regardless of the load.
Question 13 of 15
13. Question
1 points
For clean rooms where the dust has to be arrested down to ____, absolute HEPA filters are used:
Correct
HEPA stands for High-Efficiency Particulate Arrestance. HEPA filters are designed to remove 99.97% of airborne particles that are 0.3 microns or larger. This makes them ideal for use in clean rooms
Incorrect
HEPA stands for High-Efficiency Particulate Arrestance. HEPA filters are designed to remove 99.97% of airborne particles that are 0.3 microns or larger. This makes them ideal for use in clean rooms
Question 14 of 15
14. Question
1 points
In a duct system, in which of the following case there will be more pressure drop (loss):
Correct
In abrupt expansion in the duct, air expands suddenly which results in loss of kinetic energy and this energy is converted into pressure drop. On the other hand, when the air contracts suddenly, it gains kinetic energy and this energy is used to overcome the pressure drop.
Incorrect
In abrupt expansion in the duct, air expands suddenly which results in loss of kinetic energy and this energy is converted into pressure drop. On the other hand, when the air contracts suddenly, it gains kinetic energy and this energy is used to overcome the pressure drop.
Question 15 of 15
15. Question
1 points
Which of the following material is used if the duct application requires less weight:
Correct
Aluminum is a popular material for ductwork because it is lightweight, strong, corrosion-resistant and relatively inexpensive
Incorrect
Aluminum is a popular material for ductwork because it is lightweight, strong, corrosion-resistant and relatively inexpensive
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