What could be a possible cause for sudden foaming in a cooling tower?

What could be a possible cause for sudden foaming in a cooling tower?
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Answer :

Assuming that no other changes have been made, especially to the water treatment chemicals, the  most common outcome to this mystery is a leaking heat exchanger.
Begin a systematic check of all of the heat exchangers that use the cooling tower water and inspect  them thoroughly for leaks. Even small amounts of some chemicals can cause big foaming problems in  the tower. In addition, not all of these components will set off a conductivity alarm
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Last Answer : (C) Both (A) & (B)

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Last Answer : (C) Hot water entering the tower and the cooled water leaving the tower

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Last Answer : (D) Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)

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Last Answer : (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height. (A) 10-15 (B) 30-40 (C) 70-80 (D) 90-100

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Last Answer : (A) 10-15

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Last Answer : (D) All (A), (B) and (C)

In a cooling tower, water becomes cool by (A) Loosing sensible heat (B) Heat transfer to surroundings (C) Vaporisation due to heat loss to air (D) Loosing latent heat

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Last Answer : (C) Both (A) & (B)

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air. (A) Wet bulb (B) Dry bulb (C) Saturation (D) Dew point

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