Allied & ICAR Exam Bank • ALLIED_0217 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing

Question Statement:

A power chaff cutter has 2 knives rotating at $360\text{ rpm}$. Feed roll advance is $1.2\text{ cm}$ per cut. Throat opening is $20\text{ cm} \times 10\text{ cm}$ and fodder bulk density is $250\text{ kg/m}^3$. With filling factor $0.70$, output capacity in kg/h is:

Answer Key:

1814.4

Step-by-Step Solution & Explanation

Cuts/min $= 720$. Advance/min $= 720 \times 0.012 = 8.64\text{ m/min}$. Area $= 0.02\text{ m}^2$. Vol/h $= 0.02 \times 8.64 \times 60 = 10.368\text{ m}^3/\text{h}$. Mass $= 10.368 \times 250 \times 0.70 = 1814.4\text{ kg/h}$.
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