Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
1) From those items listed, which one causes the greatest percentage of water loss in a cooling tower?
A) blow-down B) spray carryover C) evaporation D) leakage |
C) evaporation
|
|
|
2) If there is no change in the amount of moisture actually present in the air, a rise in air temperature ---
A) reduces the relative humidity B) has no effect on the humidity C) increases the relative humidity D) increases the humidity and reduces the barometric pressure |
A) reduces the relative humidity
|
|
|
3) The evaporation process in a cooling tower would be the lowest with a relative humidity reading of ---
A) 10 percent B) 30 percent C) 60 percent D) 90 percent |
D) 90 percent
|
|
|
4) When the wet-bulb and dry-bulb temperature readings are identical this indicates a relative humidity of ---
A) 0 percent B) 20 percent C) 50 percent D) 100 percent |
D) 100 percent
|
|
|
5) The principle performance factor of a cooling tower is its ---
A) cooling range B) approach temperature C) humidity factor D) hot water inlet-temperature |
B) approach temperature
|
|
|
6) Which one of the below named cooling tower types or styles requires the greatest structure volume per unit of cooling capacity?
A) counter flow B) forced draft C) natural draft D) induced draft |
C) natural draft
|
|
|
7) Hyperbolic cooling towers use the principle of ---
A) natural draft B) forced draft C) balanced draft D) induced draft |
A) natural draft
|
|
|
8) The induced-draft cooling tower has the fan located at --
A) the bottom of the tower B) one side of the tower C) the top of the tower D) both sides of the tower |
C) the top of the tower
|
|
|
9) In the induced-draft counter-flow cooling tower ---
A) both air and water flow in the same direction B) air enters at or near the base of the tower C) air enters at the side of the tower D) air enters at the top and discharges out through both sides |
B) air enters at or near the base of the tower
|
|
|
10) Which one of the following factors does not serve to improve cooling tower efficiency?
A) correct fan blade pitch B) low relative humidity C) high percentage of air recirculation D) good contact between air and water |
C) high percentage of air recirculation
|
|
|
11) Tower fill serves to ---
A) decrease air-contact time B) slow down the rate of evaporation C) fliter the cooling water D) break up the falling water |
D) break up the falling water
|
|
|
12) Decomposition of the lignin in the wood of a cooling tower is referred to as ---
A) brown-rot B) algaecide attack C) white rot D) phoshate poisoning |
C) white rot
|
|
|
13) Which one of the below items would tend to cause the greatest increase in conductivity readings for cooling water?
A) evaporation B) spray loss C) make-up water D) acid-feed |
A) evaporation
|
|
|
14) Increasing the acid feed to cooling tower water will ---
A) decrease the pH B) increase the pH C) decrease the conductivity D) increase the alkalinity |
A) decrease the pH
|
|
|
15) The primary purpose of feeding phosphate to a cooling tower system is ---
A) to decrease the carbonate scale B) to protect the metal components from corrosion C) to decrease the sulphates D) to speed up evaporation |
B) to protect the metal components from corrosion
|
|
|
16) The weep-hole in the tip of each cooling tower fan blades serves to eliminate ---
A) blade stress B) air noise C) temperature build up D) the accumulation of condensation inside the blade |
D) the accumulation of condensation inside the blade
|
|
|
17) The main advantage the dry cooling tower has over the wet type is ---
A) air requirements are less B) tower internals (heat exchanger) are less expensive than the wet type C) more cooling with a smaller size tower D) reduced water requirements |
D) reduced water requirements
|
|
|
18) The wood portions of a cooling tower which usually have the longest life are ---
A) the drift eliminators B) the tower-fill components C) those portions which are completely wet or dry D) those portions exposed only to moisture and oxygen |
C) those portions which are completely wet or dry
|
|
|
From the below graph, given a dry bulb temperature of 110 degrees F and wet bulb temperature of 85 degrees F the relative humidity would be closest to --- (Dwg later)
A) 10 percent B) 25 percent C) 35 percent D) 55 percent |
C) 35 percent
|
|
|
20) From the relative humidity obtained in question #19 above, the dew point temperature would be ---
A) 68 degrees F B) 70 degrees F C) 78 degrees F D) 88 degrees F |
C) 78 degrees F
|
