🔍 Key Concepts

• Observe how many rotors/screws are shown (look for the labeled power rotor and idler rotors). • Identify where the inlet/suction bell is located in relation to the length of the screws (at the end or near the center). • Recall that hydraulic balance in screw pumps is related to where suction enters along the screw length.

💭 Think About

• From the cross‑section, how many separate helical elements actually rotate and mesh together in the pumping chamber? • Does the fluid enter right at one end of the screw assembly or closer to the middle of the screw length? How would that affect axial thrust on the rotors? • Which answers match both the rotor count you see and the suction location you identify in the drawing?

✅ Before You Answer

• Carefully count distinct screws/rotors in the illustration before choosing between “double” and “triple.” • Locate the inlet bell/suction port on the figure (check the parts list numbers) to decide between “center” and “end” suction. • Ensure your final choice matches both: correct number of screws and correct suction location; eliminate any option that only matches one of these.