Conveyors: the type commonly referred to as a “scraper” or “drag” conveyor is which of the following?

Introduction / Context:
Different conveyors are selected based on the material handled and layout constraints. The term “scraper” refers to flights that drag material along a trough, distinct from belts, aprons, or screws.

Given Data / Assumptions:

• We must identify which design is synonymous with “scraper”.
• Terminology: flight = scraper = drag conveyor.

Concept / Approach:
Flight (drag) conveyors have paddles or scrapers attached to a chain moving in a closed trough; these scrapers drag bulk solids along. Apron conveyors use overlapping pans; screw conveyors use a helical screw; belts use a flexible belt – none are termed “scrapers”.

Step-by-Step Solution:
Map the synonym: scraper = drag = flight conveyor.Choose the option explicitly naming flight (drag/scraper).

Verification / Alternative check:
Materials handling texts describe scraper conveyors as drag or flight conveyors.

Why Other Options Are Wrong:
Apron/Screw/Belt: different operating principles and standard names.

Common Pitfalls:
Assuming “flight” always means screw flight; here it means chain-mounted scrapers.

Final Answer:
Flight (drag/scraper) conveyor