Allied & ICAR Exam Bank • ALLIED_0585 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Engineering Properties of Grains

Subtopic: Engineering Properties of Grains

Question Statement:

Terminal velocity $v_t$ of a grain particle in an upward vertical air stream is the air velocity at which:

Options:

  • (A) The net aerodynamic drag force plus buoyancy force exactly equals the gravitational downward force
  • (B) Air velocity reaches the speed of sound
  • (C) The particle accelerates indefinitely upward
  • (D) Pressure drops to zero

Answer Key:

A

Step-by-Step Solution & Explanation

At terminal velocity, drag $F_d = \frac{1}{2} C_d \rho_a v_t^2 A$ equals net gravitational weight $W - F_b = m g (1 - \rho_a / \rho_p)$, so net vertical acceleration is zero.
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