Roots blower pressure rise mechanism Statement: In a roots blower, the increase in delivery pressure is entirely due to backflow from the high-pressure side when trapped air pockets open to the outlet. Decide whether the statement is correct.

Given data

• Machine: roots blower (positive-displacement rotary blower).

Concept/ApproachA roots blower does not compress internally while carrying air from inlet to outlet. When the trapped volume first communicates with the high-pressure outlet, backflow of air raises the trapped air pressure to delivery pressure, causing the observed pressure rise.

Final AnswerTrue