Calcium sulphate scaling increases with:

Calcium sulphate scaling increases with:

a. Rise in pH and decrease in temperature
b. Decrease in pH and increase in temperature
c. Rise in pH and temperature
d. Decrease in pH and temperature





Answer: B

Sulphuric acid is used in the cooling tower to prevent?

Sulphuric acid is used in the cooling tower to prevent?

a. Scaling
b. Corrosion
c. Biological fouling
d. Wood deterioration



Answer: A

The rate of calcium bicarbonate breakdown and calcium carbonate scaling increases with:

The rate of calcium bicarbonate breakdown and calcium carbonate scaling increases with:

a. Rise in pH and decrease in temperature
b. Decrease in pH and increase in temperature
c. Rise in pH and temperature
d. Decrease in pH and temperature





Answer: C

Crossflow towers:

Crossflow towers:

a. have low pressure drop in relation to its capacity
b. have high pressure drop in relation to its capacity
c. have lower fan power requirement leading to lower energy costs
d. have high fan power requirements
e. A and C





Answer: E

Dissolved solids build up in a closed cooling tower system as the water evaporates from the system. This buildup is controlled by:

Dissolved solids build up in a closed cooling tower system as the water evaporates from the system. This buildup is controlled by:

a. Adding chemicals to remove the dissolved solids
b. Treating the water supply to remove dissolved solids
c. Scraping the scale from the cooling tower components on a regular basis
d. bleeding a portion of the water from the system continuously




Answer: D

The average amount of water volume that evaporates from a cooling tower is:

The average amount of water volume that evaporates from a cooling tower is:

a. 2%
b. 10%
c. 15%
d. 5%
e. 3.5%





Answer: D

High discharge water temperature from the cooling tower could be caused by:

High discharge water temperature from the cooling tower could be caused by:

a. Low wet bulb air temperature
b. High wet bulb air temperature
c. Low dry bulb air temperature
d. Fine water spray in the tower
e. Low concentration of solids in the water





Answer: B

Excessive wind velocity in a natural draft, cooling tower may cause:

Excessive wind velocity in a natural draft, cooling tower may cause:

a. Louvers to become broken
b. High water drift or losses
c. Rotation reversal of the fan
d. Over-cooling of the water
e. Under-cooling of the water





Answer: B

Natural draft cooling towers operate most effectively in large open spaces and:

Natural draft cooling towers operate most effectively in large open spaces and:

a. Where wind is relatively constant
b. Where relative humidity is high
c. Where a large body of water is nearby
d. Require a windbreak
e. Must not be in direct sunlight





Answer: A

Organic growths also called _____ can reduce the flow rates in heat exchanger tubes and channels.

Organic growths also called _____ can reduce the flow rates in heat exchanger tubes and channels.

a. Algae
b. Slime
c. Fungi
d. Spores
e. Silt




Answer: B

Air flow in a natural draft cooling tower is dependent upon the:

Air flow in a natural draft cooling tower is dependent upon the:

a. Speed of the cooling fan
b. Volume of water flowing through
c. Partial pressure exerted above the surface of the sump.
d. Differences in the temperature of the air leaving and entering the cooling tower
e. Wind direction





Answer: D

The principal cause of steel corrosion in cooling towers is:

The principal cause of steel corrosion in cooling towers is:

a. Dissolved carbon dioxide
b. High pH
c. Dissolved oxygen
d. Low pH
e. Dissolved hydrogen





Answer: C

Natural draft cooling towers are divided into:

Natural draft cooling towers are divided into:

a. Dry and wet types
b. Closed and semi closed types
c. Atmospheric towers and chimney towers
d. Filled and unfilled types
e. Open and filled types




Answer: C

Your cooling tower fan motor is running hot and is noisy.. after examining the motor, you discover that the bearings need replacement. The evidence you discovered was: ?

Your cooling tower fan motor is running hot and is noisy.. after examining the motor, you discover that the bearings need replacement. The evidence you discovered was: ?

a. The motor was running on a single phase
b. The motor windings were faulty
c. You heard a noise that sounded like a bad bearing
d. The rotor was rubbing the stator
e. The gear reducer pinion shaft was misaligned




Answer: D

The main scale forming substance in cooling water towers is:

The main scale forming substance in cooling water towers is:

a. Calcium bicarbonate
b. Sodium sulphite
c. Potassium hydroxide
d. Calcium carbonate
e. Sodium Phosphate





Answer: D

With all other factors being equal, a counter-flow cooling tower _____________ as a cross-flow cooling tower.

With all other factors being equal, a counter-flow cooling tower _____________ as a cross-flow cooling tower.

a. Is not as tall
b. Has much less cooling capacity
c. Requires less floor space
d. Requires less fan power
e. Has a lower pressure drop



Answer: C

Biological fouling in recirculating cooling water towers is caused by algae, _____ and bacteria growth.

Biological fouling in recirculating cooling water towers is caused by algae, _____ and bacteria growth.

a. Flora
b. Fauna
c. Micro-organisms
d. Biological
e. Fungi



Answer: E

Scaling is not as severe in cooling towers when compared to boilers because:

Scaling is not as severe in cooling towers when compared to boilers because:

a. Cooling tower water does not evaporate
b. There are not as many dissolved solids in tower water
c. Pressure is not as high
d. Water temperatures are not as highin cooling towers
e. Cooling tower water is constantly being aerated




Answer: D

Air flow in a natural draft cooling tower is dependent upon the:

Air flow in a natural draft cooling tower is dependent upon the:

a. Speed of the cooling fan
b. Volume of water flowing through
c. Partial pressure exerted above the surface of the sump.
d. Differences in the temperature of the air leaving and entering the cooling tower
e. Wind direction





Answer: D

A valve that bypasses water flow away from the fill of a cooling tower during cold weather should not be closed until the temperature reaches:

A valve that bypasses water flow away from the fill of a cooling tower during cold weather should not be closed until the temperature reaches:

a. -0.5°C
b. +0.5°C
c. +5°C
d. +20°C
e. +27°C




Answer: E