While evaluating a stationary power thresher for wheat, grain:straw ratio 45%, moisture content (dry basis) 14%, over 5 min: grain at main outlet = 16 kg; clean grain at bhusa outlet = 0.3 kg; clean grain at sieve underflow+overflow = 0.2 kg; unthreshed grain (all outlets) = 0.5 kg. Percentage of blown and spilled grain are
Options:
(A) 1.18, 3.03
(B) 1.25, 1.82
(C) 1.76, 1.18
(D) 1.88, 1.25
Official Answer Key:
C
Step-by-Step Solution & Explanation
Total grain handled = main outlet + bhusa outlet + sieve outlet + unthreshed = 16 + 0.3 + 0.2 + 0.5 = 17 kg. Grain lost with straw/bhusa is the blown grain: 0.3/17 × 100 = 1.76%. Grain lost through the sieve (underflow+overflow, i.e. spilled on the ground) is the spilled grain: 0.2/17 × 100 = 1.18%. Answer: 1.76, 1.18.
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