Answer to Question 1ANS: Round
Answer to Question 2submersible, centrifugal head, air-lift
submersible, air-lift, centrifugal head
centrifugal head, air-lift, submersible
centrifugal head, submersible, air-lift
submersible, centrifugal head, air-lift
air-lift, centrifugal head, submersible
air-lift, submersible, centrifugal head