ANS:B - Rotary disc filter

Among the options provided, the Rotary disc filter is a type of vacuum filter.

Explanation:

• Vacuum Filter: A vacuum filter operates by applying a vacuum (reduced pressure) to assist in the filtration process, separating solids from liquids. This method is commonly used in various industrial processes where efficient separation and drying of solids are required.
• Types of Vacuum Filters:
  • Rotary Disc Filter: This type of filter consists of a series of rotating discs covered with filter media. As the discs rotate, they pass through different stages of filtration (vacuum, cake formation, washing, and drying), allowing for continuous operation.
• Other Options:
  • Filter Press: Operates under pressure rather than vacuum. It uses pressure to squeeze out liquid from the filter cake after filtration.
  • Batch Basket Centrifuge: Uses centrifugal force to separate solids from liquids and is not typically classified as a vacuum filter.
  • Tank Filter (Nutsch Filter): Operates under pressure or gravity and does not involve vacuum filtration directly.