# Online Quiz On Cooling Towers

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Weekly Quiz - Quiz 1 - 04th Jan, 2020
Test Your knowledge on Cooling Tower – Online Quiz

• 1.

### Approach of a Cooling Tower is:

• A.

Difference between Cold water outlet temperature and Wet bulb temperature

• B.

Difference between Hot water Inlet temperature and Wet bulb temperature

• C.

Difference between Hot water Inlet temperature and Cold Water Outlet temperature

• D.

Difference between Atmoshpheric temperature and Wet bulb temperature

A. Difference between Cold water outlet temperature and Wet bulb temperature
Explanation
The approach of a cooling tower is determined by the difference between the cold water outlet temperature and the wet bulb temperature. This means that the cooling tower is designed to cool the water to a certain temperature lower than the wet bulb temperature. The larger the difference between these two temperatures, the more effective the cooling tower is in removing heat from the water.

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• 2.

### Purpose of Louver is:

• A.

To change the direction of Air inlet flow in the uniform manner

• B.

To prevent the water droplets splashing out of the tower

• C.

Both of the Above

• D.

None of the Above

C. Both of the Above
Explanation
The purpose of a louver is to serve both functions mentioned in the options. It is used to change the direction of the air inlet flow in a uniform manner, ensuring proper ventilation and distribution of air. Additionally, it also prevents water droplets from splashing out of the tower, which is important for maintaining the efficiency and safety of the system. Therefore, the correct answer is "Both of the Above."

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• 3.

### Range of the Cooling tower is:

• A.

Difference between Cold water outlet temperature and Wet bulb temperature

• B.

Difference between Hot water Inlet temperature and Wet bulb temperature

• C.

Difference between Hot water Inlet temperature and Cold Water Outlet temperature

• D.

Difference between Atmoshpheric temperature and Wet bulb temperature

C. Difference between Hot water Inlet temperature and Cold Water Outlet temperature
Explanation
The range of the cooling tower refers to the temperature difference between the hot water inlet and the cold water outlet. This range represents the effectiveness of the cooling tower in cooling down the water. A larger temperature difference indicates that the cooling tower is able to cool the water more efficiently.

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• 4.

### Purpose of Drift Eliminator is :

• A.

To reduce the entrainment of Water droplets in Air

• B.

To prevent the water droplets splashing out of the tower

• C.

To provide the required surface area for heat transfer

• D.

All of these

A. To reduce the entrainment of Water droplets in Air
Explanation
The purpose of a drift eliminator is to reduce the entrainment of water droplets in the air. This means that it helps to prevent water droplets from escaping the cooling tower and being carried away by the air. By reducing the amount of water droplets that are entrained in the air, the drift eliminator helps to improve the efficiency of the cooling tower and prevent water loss. Additionally, reducing the entrainment of water droplets in the air also helps to prevent potential environmental issues, such as the spread of waterborne diseases or contamination.

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• 5.

### The ratio of dissolved solids in circulating water to dissolved solids in makeup water is called as :

• A.

Evaporation ratio

• B.

Cycle of Concentration

• C.

L/G Ratio

• D.

Efficiency

B. Cycle of Concentration
Explanation
Cycle of Concentration refers to the ratio of dissolved solids in circulating water to dissolved solids in makeup water. It is a measure of the concentration of impurities in the water as it circulates through a system. A higher cycle of concentration indicates a higher level of impurities in the water, which can lead to scaling and other issues in the system. Monitoring and controlling the cycle of concentration is important for maintaining the efficiency and performance of water treatment systems.

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• 6.

### Purpose of blowdown is to:

• A.

Remove the heat from Hot water

• B.

Maintain the Cold Water outlet temperature

• C.

Limit the increase in the concentration of solids in the water due to evaporation

• D.

To increase the efficiency

C. Limit the increase in the concentration of solids in the water due to evaporation
Explanation
The purpose of blowdown is to limit the increase in the concentration of solids in the water due to evaporation. When water is heated and evaporates, the dissolved solids in the water become more concentrated. This can lead to scaling and corrosion in the system. Blowdown helps to remove a portion of the concentrated water, reducing the concentration of solids and preventing potential damage to the system.

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• 7.

### Cooling tower acceptance testing procedures are recommended by:

• A.

CTI

• B.

API

• C.

ASME

• D.

ISO

A. CTI
Explanation
Cooling tower acceptance testing procedures are recommended by CTI (Cooling Technology Institute). CTI is a professional organization that provides resources and guidelines for the design, operation, and maintenance of cooling towers. They are recognized as a leading authority in the industry and their recommendations are widely followed to ensure the proper functioning and efficiency of cooling towers.

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• 8.

### A cooling tower is said to be performing well when:

• A.

Approach is closer to zero

• B.

Range is closer to zero

• C.

Approach is larger than design

• D.

Range is larger than design

A. Approach is closer to zero
Explanation
A cooling tower is said to be performing well when the approach is closer to zero. The approach refers to the temperature difference between the cooled water leaving the tower and the wet-bulb temperature of the air entering the tower. A smaller approach indicates that the cooling tower is effectively cooling the water and achieving a more efficient heat transfer. This means that the cooled water is closer in temperature to the wet-bulb temperature, resulting in better cooling efficiency.

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• 9.

### Purpose of Cooling tower basin is:

• A.

To serve as receptacle for Cooled water

• B.

To provide the storage capacity during Makeup water failure

• C.

To act as a reservoir for the cooling water pumps

• D.

All of these

D. All of these
Explanation
The purpose of a cooling tower basin is to serve as a receptacle for cooled water, provide storage capacity during makeup water failure, and act as a reservoir for the cooling water pumps. It performs all of these functions to ensure efficient cooling of water and proper functioning of the cooling system.

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• 10.

### The type of Cooling tower used in Power plants is:

• A.

Hyperbolic Natural Draft Towers

• B.

Forced Draft Counterflow Towers

• C.

Induced Draft Counterflow Towers

• D.

Dry Towers

A. Hyperbolic Natural Draft Towers
Explanation
Hyperbolic natural draft towers are the type of cooling towers used in power plants. These towers rely on the natural draft created by the difference in temperature between the hot water inside the tower and the cooler air outside. The hyperbolic shape of the tower enhances the draft effect, allowing for efficient cooling. This type of tower is commonly used in power plants as it provides effective cooling for large quantities of hot water generated during power generation processes.

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• 11.

### A better Performance indicator of the Cooling tower is its :

• A.

Dry bulb temperature

• B.

Approach

• C.

Range

• D.

Wet bulb Temperature

B. Approach
Explanation
The better performance indicator of a cooling tower is its approach. Approach refers to the difference between the cold water temperature leaving the cooling tower and the wet bulb temperature of the air entering the tower. A smaller approach indicates that the cooling tower is more efficient at cooling the water. It shows how effectively the cooling tower is able to transfer heat from the water to the air. A lower approach value indicates better performance and higher efficiency of the cooling tower.

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• 12.

### L / G ratio in cooling tower is the ratio between:

• A.

• B.

Length and girth

• C.

Air mass flow rate and water flow rate

• D.

Water flow rate and Air mass flow rate

D. Water flow rate and Air mass flow rate
Explanation
The L/G ratio in a cooling tower refers to the ratio of water flow rate to air mass flow rate. This ratio is important in determining the efficiency of the cooling tower as it affects the cooling capacity and heat transfer. A higher L/G ratio indicates a higher water flow rate relative to the air mass flow rate, which can result in better cooling performance. Conversely, a lower L/G ratio may indicate a lower water flow rate relative to the air mass flow rate, which can lead to reduced cooling efficiency.

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• 13.

### Cooling Tower Efficiency =

• A.

Range/ Approach x 100

• B.

Approach/ Range x 100

• C.

Range/ (Range + Approach) x 100

• D.

Cold Water Temperature/ Hot water Temperature x 100

C. Range/ (Range + Approach) x 100
Explanation
The correct answer is Range/ (Range + Approach) x 100. Cooling tower efficiency is calculated by dividing the range (the difference between the hot water temperature entering the tower and the cold water temperature leaving the tower) by the sum of the range and approach (the difference between the cold water temperature entering the tower and the wet-bulb temperature). This ratio is then multiplied by 100 to express the efficiency as a percentage.

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• 14.

### In practice, Common efficiency range achieved in the cooling tower is:

• A.

98 to 100 %

• B.

90 to 95 %

• C.

95 to 98 %

• D.

70 to 75 %

D. 70 to 75 %
Explanation
The common efficiency range achieved in a cooling tower is typically between 70 to 75%. This means that the cooling tower is able to effectively cool the water by removing heat from it, resulting in a decrease in temperature. The efficiency range indicates that the cooling tower is able to remove a significant amount of heat from the water, but there is still some heat that remains. This range is considered to be a practical and achievable efficiency for cooling towers in real-world applications.

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• 15.

### The cycle of concentration normally varies from:

• A.

0 to 3

• B.

3 to 7

• C.

10 to 15

• D.

15 to 100

B. 3 to 7
Explanation
The cycle of concentration refers to the ratio of dissolved solids in the cooling water to the dissolved solids in the makeup water. A higher cycle of concentration indicates a higher concentration of dissolved solids in the cooling water compared to the makeup water. The range of 3 to 7 is commonly recommended for the cycle of concentration in cooling water systems. This range allows for effective control of scale and corrosion while minimizing water and chemical usage.

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• 16.

### To reduce the makeup water requirement of the cooling tower, Cycle of Concentration to be kept:

• A.

Zero

• B.

As High As Possible

• C.

Low

• D.

Very Low

B. As High As Possible
Explanation
To reduce the makeup water requirement of the cooling tower, the Cycle of Concentration should be kept as high as possible. The Cycle of Concentration is a measure of how many times the cooling water can be recirculated before it needs to be replaced. By keeping the Cycle of Concentration high, the amount of makeup water needed to replenish the system is minimized. This is beneficial as it reduces the cost and environmental impact associated with sourcing and treating large volumes of makeup water. Higher Cycle of Concentration also helps in minimizing the amount of chemicals required for water treatment.

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• 17.

### Calculate the blow down loss of the Cooling tower from the following data. a) Evaporation Loss is 500 m3/hr, b) Cycle of Concentration is 5:

• A.

100 m3/hr

• B.

2500 m3/hr

• C.

125 m3/hr

• D.

Data Insufficient

C. 125 m3/hr
• 18.

### Instrument used for Measuring Wet bulb Temperature is:

• A.

Thermometer

• B.

Sling Psychrometer

• C.

Thermocouple

• D.

RTD

B. Sling Psychrometer
Explanation
A sling psychrometer is used to measure the wet bulb temperature. It consists of two thermometers, one of which has a wet wick attached to its bulb. The wet bulb thermometer measures the temperature when water evaporates from the wick, causing cooling. The dry bulb thermometer measures the ambient air temperature. By comparing the readings of the two thermometers, the wet bulb temperature can be determined. This measurement is important in determining humidity levels and calculating other meteorological parameters such as dew point and relative humidity.

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• 19.

### The temperature selection normally chosen for designing of cooling tower is:

• A.

Average maximum wet bulb for winter months

• B.

Average maximum wet bulb for summer months

• C.

Average maximum wet bulb for monsoon months

• D.

Average minimum wet bulb for summer months

C. Average maximum wet bulb for monsoon months
Explanation
The correct answer is "Average maximum wet bulb for monsoon months." This is because the wet bulb temperature is a key factor in determining the cooling capacity of a cooling tower. The monsoon months typically have the highest wet bulb temperatures, which means that the cooling tower needs to be designed to handle these conditions. By selecting the average maximum wet bulb for monsoon months, the cooling tower can be designed to effectively cool the water even during the hottest and most humid periods.

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• 20.

### Which one of the following has maximum effect on cooling tower performance:

• A.

Drift

• B.

Louvers

• C.

Fill Media

• D.

Casting

C. Fill Media
Explanation
Fill media has the maximum effect on cooling tower performance. Fill media refers to the material inside the cooling tower that increases the surface area for heat exchange between the air and water. It enhances the cooling efficiency by promoting better contact between the water and air, allowing for greater heat transfer. The design and quality of the fill media significantly impact the tower's ability to cool the water effectively. Therefore, the fill media plays a crucial role in determining the overall performance of the cooling tower.

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• 21.

### Which of the following is helpful in designing Cooling tower orientation?

• A.

Wind rose Diagram

• B.

Topographic map

• C.

Rain gauge recorder chart

• D.

Seismic Scale

A. Wind rose Diagram
Explanation
The wind rose diagram is helpful in designing cooling tower orientation because it provides information about the prevailing wind direction and speed at a particular location. By analyzing the wind rose diagram, engineers can determine the most suitable orientation for the cooling tower to maximize the efficiency of heat dissipation. The diagram helps in identifying the areas with high wind speeds and directions that will aid in the dispersion of heat and improve the overall performance of the cooling tower.

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• 22.

### The Purpose of fill is:

• A.

To prevent the water droplets splashing out of the tower

• B.

To provide the required surface area for heat transfer between air and the water

• C.

To reduce the entrainment of Water droplets in Air

• D.

To change the direction of Air inlet flow in the uniform manner

B. To provide the required surface area for heat transfer between air and the water
Explanation
The purpose of fill in a tower is to provide the required surface area for heat transfer between air and water. The fill is designed to maximize the contact between the two fluids, allowing for efficient heat exchange. As water flows over the fill, it creates a thin film that is exposed to the air, promoting evaporation and heat transfer. This increased surface area helps to enhance the cooling process and improve the tower's overall efficiency.

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• 23.

### The purpose of Torque tube is:

• A.

To Transmit the power from the motor

• B.

To Give permanent alignment of the motor, driveshaft & gear reducer

• C.

To reduce the speed of the depending on the fan requirement

• D.

None of these

B. To Give permanent alignment of the motor, driveshaft & gear reducer
Explanation
The purpose of a torque tube is to provide a permanent alignment between the motor, driveshaft, and gear reducer. This ensures that the components are properly aligned and reduces any misalignment issues that could lead to inefficiencies or mechanical failures. By maintaining a consistent alignment, the torque tube helps to optimize the transfer of power and ensures smooth operation of the system.

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• 24.

### In counter flow induced draft cooling towers water and air both enter the top and exist at the top of the cooling tower:

• A.

True

• B.

False

B. False
Explanation
In counter flow induced draft cooling towers, water and air enter at opposite ends of the tower. The water enters at the top and flows downward, while the air enters at the bottom and flows upwards. This counter flow arrangement allows for efficient heat transfer between the water and air, as the temperature difference between the two is maximized. Therefore, the correct answer is False.

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• 25.

### Cooling towers operate on the principle of:

• A.

Henry's law

• B.

Stefan-Boltzmann Law

• C.

Evaporative Cooling (Merkel Theory)

• D.

All of these

C. Evaporative Cooling (Merkel Theory)
Explanation
Cooling towers operate on the principle of evaporative cooling, also known as Merkel Theory. Evaporative cooling is a process in which heat is removed from a system by evaporating water. In a cooling tower, hot water is sprayed or poured over a fill material, which increases the surface area for evaporation. As the water evaporates, it absorbs heat from the remaining water, thus cooling it down. This cooled water is then circulated back into the system to remove heat from various industrial processes. Therefore, the correct answer is Evaporative Cooling (Merkel Theory).

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• 26.

### In which of the following fill Surface Area is more?

• A.

Splash Fill

• B.

Film Fill

B. Film Fill
Explanation
Film fill has a larger surface area compared to splash fill. Film fill consists of thin sheets or tubes that are stacked together, creating a large surface area for water to come into contact with. This design allows for better heat transfer and mass transfer between the water and the air, making it more efficient in cooling applications. On the other hand, splash fill consists of a series of splash bars that break up the water into droplets, which then fall through the air. While splash fill is effective in promoting mixing and evaporation, it has a smaller surface area compared to film fill.

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• 27.

### FRP fan blades are used in Cooling tower applications because:

• A.

It needs low starting torque

• B.

Easy handling and maintenance

• C.

• D.

All of these

D. All of these
Explanation
FRP fan blades are used in cooling tower applications because they offer low starting torque, making them easier to start and operate. Additionally, they are lightweight and easy to handle and maintain, reducing the effort and time required for maintenance. Moreover, they are energy efficient compared to metal blades, resulting in lower energy consumption and cost savings. Therefore, all of these reasons make FRP fan blades the preferred choice for cooling tower applications.

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• 28.

### Poor water distribution in a tower results in:

• A.

Scale formation on fill

• B.

Ice formation in cold climates

• C.

Wastage of Energy

• D.

All of these

D. All of these
Explanation
Poor water distribution in a tower can lead to several negative consequences. Scale formation on fill occurs when the water is not evenly distributed, causing mineral deposits to accumulate on the fill surfaces. This can reduce the efficiency of the tower and decrease its cooling capacity. Ice formation in cold climates can also occur if the water is not distributed properly and freezes in the tower, potentially causing damage to the structure. Additionally, poor water distribution can result in wastage of energy as the tower will have to work harder to compensate for the uneven distribution. Therefore, all of these outcomes can be attributed to poor water distribution in a tower.

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• 29.

### Which is India's first cooling tower manufacturer to achieve CTI certification for both counter flow and cross flow cooling towers?

• A.

Bell Cooling Towers

• B.

Flowtech Cooling Towers

• C.

Paharpur Cooling Towers

• D.

Delta Cooling Towers

C. Paharpur Cooling Towers
Explanation
Paharpur Cooling Towers is India's first cooling tower manufacturer to achieve CTI certification for both counter flow and cross flow cooling towers.

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• 30.

### To prevent Scaling, Silica level in Cooling water must be:

• A.

Less than 500 ppm

• B.

Less than 150 ppm

• C.

Less than 1000 ppm

• D.

Less than 1500 ppm

B. Less than 150 ppm
Explanation
To prevent scaling, the silica level in cooling water must be less than 150 ppm. Scaling occurs when the concentration of minerals, such as silica, in the water exceeds a certain threshold. Silica can form scale deposits on the surfaces of heat transfer equipment, reducing efficiency and potentially causing damage. By keeping the silica level below 150 ppm, the risk of scaling can be minimized, ensuring optimal performance and longevity of the cooling system.

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