Question Bank • QB_EXP_APE_PNC_002 MSQ • 2 Marks

Section 6: Agricultural Process Engineering

Pneumatic Conveying & Fluidization of Solids

Subtopic: Dilute phase vs dense phase comparison

Question Statement:

Which of the following characteristics distinguish dense-phase pneumatic conveying from dilute-phase conveying?

Options:

  • (A) Dense-phase operates at much higher solid-to-air mass loading ratios ($m_s/m_g > 20-50$)
  • (B) Dense-phase operates at lower air velocities ($3-10\text{ m/s}$) compared to dilute-phase ($18-30\text{ m/s}$)
  • (C) Dense-phase significantly reduces grain impact damage, breakage, and pipeline erosive wear
  • (D) Dense-phase requires zero pressure difference across the pipeline

Answer Key:

A, B, C

Step-by-Step Solution & Explanation

1. High solids loading is the hallmark of dense-phase plug/slug conveying (A is true). 2. Lower gas velocities prevent attrition (B is true). 3. Slower velocities drastically reduce grain fissuring and pipe abrasive wear (C is true). 4. Dense-phase requires substantially higher pressure differentials ($2-6\text{ bar}$) to push compact solid plugs (D is false).
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