GK
INVENTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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lock system
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open system
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Either A or B
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None of the above
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Detailed explanation-1: -lock, enclosure or basin located in the course of a canal or a river (or in the vicinity of a dock) with gates at each end, within which the water level may be varied to raise or lower boats. Where the required lift is of considerable height, a series of connected but isolable basins, or locks, is used.
Detailed explanation-2: -A pound lock is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock.
Detailed explanation-3: -The lower gates and bottom sluice are closed. The top sluices are then opened so that the water level rises in the lock, floating the boat up to the next level.