Question Bank • QB_APE_EXP_004 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Engineering Properties of Agriculture Produce

Subtopic: Frictional properties

Question Statement:

During a tilting plate friction test of paddy grains on mild steel sheet, sliding of the grain mass commences when the plate is tilted to an angle of $24.0^\circ$ with the horizontal. The static coefficient of friction ($\mu$) is ________ (round off to 3 decimal places).

Answer Key:

0.445

Step-by-Step Solution & Explanation

The static coefficient of external friction $\mu$ is related to the angle of internal friction / angle of repose ($\theta$): $\mu = \tan \theta = \tan(24.0^\circ) \approx 0.4452 \approx 0.445$
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