Subtopic: Cost analysis of implements and tractors
Question Statement:
In rotary tiller, the total energy requirement for carrying out tillage will decrease if
Options:
(A) the bite length is increased
(B) the bite length is decreased
(C) the cone index of soil is higher
(D) forward speed of the machine is reduced
Official Answer Key:
A
Step-by-Step Solution & Explanation
Bite length (the length of soil slice cut per blade per revolution) governs the number of blade strikes needed to till a given area — a longer bite length means fewer blade passes/strikes are needed to till the same length of land, reducing total cutting/energy input per unit area (though each individual cut becomes slightly larger, the net specific energy requirement of a rotary tiller decreases as bite length increases, a well-established rotary tillage relationship). (B) decreasing bite length increases the number of strikes and hence energy. (C) higher cone index means harder/more resistant soil — increases energy. (D) reducing forward speed at constant rotor speed DECREASES bite length, which increases energy (opposite of what is asked). Answer: (A).
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