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Answer:
1.Discharge valve
If the conveyed material is abrasive, any valve in the conveying line will be subject to wear. With top-discharge blow tanks, discharge valves are not necessary. They will, however, enable a blow tank to be pressurized quickly and so give an overall increase in the conveying efficiency and material flow rate. In bottom-discharge blow tanks the discharge valve will be necessary in most cases in order to prevent flooding of free-flowing materials into the conveying line, and hence overload the conveying system on start-up
2.Genre consists of four elements or parts: character, story, plot and setting. An equation for remembering the genre is: Story (Action) + Plot + Character + Setting = Genre. This becomes an easy way to remember the elements of a genre.
3.It serves as an original source of information about the topic.Similar definations can be used in library science,and other areas of schilarship,although different fields have somewhat different difinations
4.yes information is essential.
Information is essential because it is a part of our everyday life, information is needed to be understood and to understand.