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10 Cards in this Set
- Front
- Back
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In an Ammonia Absorption System what is used as the absorbent?
a) Ammonia b) Air c) Lithium Bromide d) Water e) Freon |
D
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Which of the following is not found on the low side of an ammonia system? a) Evaporator b) Generator c) Absorber d) Cooling water e) Low pressure ammonia vapour |
B
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Ammonia systems are seldom used for air conditioning purposes in large buildings mainly because a) ammonia systems require too much maintenance b) ammonia systems are too expensive c) ammonia is too toxic d) ammonia does not provide sufficient cooling power for large operations e) ammonia systems require a separate power supply not available in most large buildings |
C
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In comparing absorption and compression systems which of the following comparisons is true? a) Pumps in absorption systems require more electrical power. b) Absorption systems require less space than compression systems. c) Cooling water requirements are larger for an absorption system than for a compression system. d) More equipment and piping are required for a compression system. e) Slugs of liquid carried over from the evaporator do not damage the compression system but can ruin an absorption system. |
C
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In a Lithium Bromide System which of the following is the refrigerant? a) Lithium Bromide b) Ammonia c) Freon-22 d) Water e) None of the above |
D
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In order to lower the boiling point of the refrigerant it is important that the system maintain a) an extremely high vacuum b) very high pressure c) very low temperatures d) very fast refrigerant flow e) high absorbent circulation |
A
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Which of the following statements about Lithium bromide systems is false? a) Lithium bromide solution has the ability to absorb water vapour readily. b) The operating cycle in the system is continuous. c) Evacuating the system lowers the boiling point of water. d) As water vapour is absorbed by the Lithium Bromide the vacuum decreases. e) System efficiency is increased by forcing water through a spray header. |
D
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The absorber is equipped with a pump for which of the following reasons? a) To force water into a finely divided state b) To keep the cycle pressure constant c) To decrease the refrigerant evaporation point d) To speed the absorption of water vapour e) To decrease contact between absorbent and refrigerant |
D
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What is the function of the concentrator (generator)? a) To cool the refrigerant vapour b) To increase the absorbency potential of used Lithium Bromide c) To speed up the evaporation of the refrigerant d) To cool the concentrated absorbent e) To exchange heat between the high temperature refrigerant vapour and the atmosphere |
B
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Most absorbency systems are put in place where there is cheap excess or waste heat available. What is this heat primarily used for? a) To pressurize the system b) To maintain the continuous vacuum c) To decrease the evaporation point of the refrigerant d) To run the pumps which force the water through the sprayers e) To evaporate the water out of the weak Lithium Bromide |
E
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