• 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

• Objectives and Functions of Blanching:
• Blanching is a mild hydrothermal pre-treatment (hot water at 85–95°C or steam) for fruits and vegetables:
• Inactivation of enzymes: Inactivates polyphenol oxidase, catalase, and peroxidase to prevent browning and nutrient loss.
• Softening of tissue: Expels intercellular air and softens cell structure to facilitate packaging into cans.
• Cleaning of raw material: Removes adhering surface dust and reduces initial microbial load.
• (B) Killing of pathogenic microbes: Blanching does not achieve commercial sterility or complete destruction of spores; full thermal processing is performed later.
• Conclusion: Major functions include (A), (C) and (D) only (Option 3).

Correct option: (3) (A), (C) and (D) only.

• Glazing in Rice (Paddy) Milling:
• Glazing is a finishing process in polished rice production where milled rice grains are treated with a mixture of glucose and talc or paraffin in a glazing drum to impart a glossy, translucent sheen and protect against insect attack.
• Glazing is exclusively associated with Paddy (Rice) processing.
• Conclusion: Related to Paddy (Option 1).

Correct option: (1) Paddy