Q. The law of ________ states that mass can neither be created nor destroyed.

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Q. What is the size of openings of a coarse screen?

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Q. While designing a mechanical screen, the clear space between the bars would be in what range?

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Q. What is the maximum approach velocity to be considered for a mechanical screen while designing it?

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Q. What is the size of the openings for a fine screen?

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Q. What is the percentage of TSS removed by a rotary drum fine screen?

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Q. Which type of mixers are used to mix coagulants like alum, ferric ammonium sulphate and coagulant aids such as polyelectrolyte and lime?

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Q. Which type of mixer is used when the flow needs to be changed often?

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Q. In order to prevent clogging what should be provided prior to tube settlers?

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Q. Which of these is not a type of grit chamber?

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Q. What is the detention time considered while designing a Grit chamber?

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Q. In which of the following systems no flow is added or allowed to leave during the design detention time?

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Q. In __________ reactor the bed is filled with a packing material that expands when wastewater moves upwards.

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Q. What is the aspect ratio of a stirred tank bioreactor?

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Q. The diameter of the impeller is usually 1/3rd of the vessel diameter.

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Q. In bubble column bioreactor, the flow rate of air/ gas influences the performance of oxygen transfer.

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Q. The vessel used for bubble column bioreactors is _______

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Q. In which of the following bioreactors is the vessel divided into two interconnected zones?

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Q. Which of the following reactors is comparable to bubble column bioreactor?

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Q. Which of the following bioreactor consists of biocatalysts on or within the matrix of solids?

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