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Fluid Mechanics - Engineering

Q1:

Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

A piston

B gear

C positive displacement

D sump

ANS:B - gear

Pumping of a corrosive liquid is generally preferred to be done by a gear pump, as it can be made of a variety of materials including plastics.

Explanation:

  1. Gear Pumps:
    • Gear pumps are a type of positive displacement pump that are well-suited for pumping corrosive liquids.
    • They can be constructed from a variety of materials, including plastics and stainless steel, which are resistant to corrosion.
    • They provide a steady flow and can handle viscous and corrosive liquids effectively.
  2. Piston Pumps:
    • Piston pumps are also a type of positive displacement pump but are typically more complex and can be more difficult to make from corrosion-resistant materials.
    • They are better suited for high-pressure applications rather than handling corrosive fluids.
  3. Positive Displacement Pumps:
    • This term encompasses several types of pumps, including piston, gear, and diaphragm pumps. Among these, gear pumps are particularly noted for their suitability with corrosive liquids due to material options and design simplicity.
  4. Sump Pumps:
    • Sump pumps are typically used for removing water that has accumulated in a sump basin, commonly found in the basements of homes.
    • They are not typically designed for handling corrosive liquids and are often made from materials that might not be resistant to corrosion.

Conclusion:

Given the need for handling corrosive liquids and the versatility in materials, gear pumps are generally preferred. They offer reliable performance, can be made from corrosion-resistant materials like plastics, and are effective in pumping corrosive fluids.