Q. The presence of DO is necessary for wastewater.

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Q. Air is used to ________ the filter bed.

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Q. Which technology’s principle is used in screw blowers?

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Q. Which blower among the following has the highest nominal efficiency?

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Q. When is high pressure required, which type of blower is preferred?

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Q. Which type of blower is preferred for fluid bed reactor?

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Q. What is the specific ratio for a blower?

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Q. Normally what is the pressure under which centrifugal blowers operate?

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Q. Which blower is used when the system is prone to clogging?

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Q. Centrifugal pumps have a greater speed of rotation when compared to that of positive displacement blower.

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Q. Dimensionless pressure rise is not dependent on which of the following?

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Q. What is the maximum discharge pressure of a twin lobe blower?

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Q. How is the static pressure drop in the water column related to the air flow rate?

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Q. Which of these is not a characteristic of variable speed drive?

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Q. The surface water quality is affected by _______ and infiltration from rainfall.

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Q. Function of the intended uses of water can achieve the desired water quality.

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Q. There is a direct relation between water use and its required quality.

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Q. _________ are constructed for water supply, electricity generation, recreation, irrigation and others.

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Q. What is the next step after water abstraction in wastewater treatment?

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Q. Which of the following requires aesthetically pleasant water?

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