• Operational Characteristics of Screw Conveyors:
• screw conveyor consists of a helical auger revolving inside a stationary U-shaped or cylindrical trough.
• Due to continuous rubbing friction between the material, auger flights, and trough wall:
• Power consumption is relatively high compared to belt conveyors or bucket elevators ($2-3$ times higher power).
• Continuous abrasive contact makes screw flights and bearings more susceptible to wear.
• Conclusion: Require relatively high power and are more susceptible to wear (Option 2).

Correct option: (2) Require relatively high power and are more susceptible to wear