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17 Cards in this Set
- Front
- Back
The most common type of mechanical draft cooling tower is: 1) An induced draft type 2) A dry type 3) A forced draft type 4) A wet type 5) A combination wet dry type |
An induced draft type |
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Cooling towers: 1. Remove the heat from the condensate 2. Should use water treatment 3. Prevent thermal pollution of rivers and lakes 4. Cannot be used during winter periods 5. Remove the sensible heat of the steam in the condenser 1) 1, 3, 4 2) 1, 2, 3 3) 1, 3, 4, 5 4) 3, 4, 5 5) 2, 3 |
2, 3 |
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Compared to a cross flow tower, a counter flow tower: 1) Is not as tall 2) Has a lower pressure drop 3) Has much less capacity 4) Requires less floor space 5) Requires less fan power |
Requires less floor space |
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The average amount of water volume that evaporates from a cooling tower is: 1) 15% 2) 5% 3) 2% 4) 10% 5) 3.5% |
5% |
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The component of wood that is leached away reducing the ability of the wood to resist decay is the: 1) Leaves 2) Natural extractives 3) Bark 4) Lignin 5) Cellulose |
Natural extractives |
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Cooling towers: 1) May contribute to the pollution problem 2) Need only be operated in the summer months 3) Remove heat from the condensate 4) Require fans 5) Do not require any maintenance |
May contribute to the pollution problem |
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The rate of heat transfer in any cooling tower system depends on the: 1. Relative velocity of both air and water during contact 2. Volume of water in contact with the air 3. Length of contact time between the air and water 4. Difference between the inlet water temperature and the inlet air wet bulb temperature 1) 1, 2, 3 2) 2, 3, 4 3) 1, 2, 4 4) 1, 3, 4 5) 1, 2, 3, 4 |
4) 1, 3, 4 |
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Cooling towers: 1) Reduce flue gas temperatures 2) Cannot be used during winter periods 3) Are used with steam turbines only 4) Remove the heat from the condensate 5) Prevent thermal pollution of rivers and lakes |
Prevent thermal pollution of rivers and lakes |
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You are replacing the cooling tower fan motor bearings because: 1) The gear reducer pinion shaft was misaligned 2) The motor was running single phase 3) Windings in the motor were faulty 4) The rotor was rubbing the stator 5) A noise that sounded like a bad bearing was heard |
The rotor was rubbing the stator |
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Advantages of ID cooling towers over FD cooling towers include: 1. Accessibility of the fan for maintenance 2. Little chance of icing up in the winter 3. Minimum noise 4. A greater ability to cool the water 5. Ability to recycle the vapor, laden air 1) 3, 4, 5 2) 1, 3, 5 3) 1, 2, 3 4) 2, 3, 5 5) 2, 3, 4 |
5) 2, 3, 4 |
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A valve that prevents water flow over the fill of a tower during cold weather should not be closed until the temperature reaches: 1) +27ºC 2) -0.5ºC 3) +20ºC 4) +5ºC 5) +0.5ºC |
1) +27ºC |
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The principle cause of steel corrosion in cooling towers is: 1) Dissolved carbon dioxide 2) Dissolved oxygen 3) High pH 4) Low pH 5) Dissolved hydrogen |
Dissolved oxygen |
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Natural draft cooling towers operate most effectively in large open spaces and: 1) Require a windbreak 2) Where relative humidity is high 3) Where wind is relatively constant 4) Must not be in direct sunlight 5) Where a large body of water is nearby |
Where wind is relatively constant |
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Natural draft cooling towers are divided into: 1) Closed and semi closed types 2) Filled and unfilled types 3) Atmospheric and chimney type 4) Dry and wet types 5) Open and filled types |
Atmospheric and chimney type |
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The main scale forming substance in cooling water towers is: 1) Calcium carbonate 2) Calcium bicarbonate 3) Sodium sulphite 4) Sodium Phosphate 5) Potassium hydroxide |
Calcium carbonate |
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To prevent cooling tower basin water from freezing during cold weather, many units are equipped with: 1) Warming tapes 2) Electric basin heaters 3) Ethylene glycol antifreeze systems 4) Ice defrosters 5) Propane burners |
Electric basin heaters |
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A cooling tower which requires neither fan nor fill is the: 1) Counter flow induced unit 2) Cross flow unit 3) Forced draft unit 4) Natural draft unit 5) Venturi unit |
Venturi unit |