Q.38
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Concave end of the disc harrow gang tends to penetrate more deeply than the convex end.
Reason (R) : The radial force, which includes the vertical support force on the disc blade, must pass slightly to the rear of
the disc centerline
In light of the above statements, choose the correct answer from the options given below.
- Forces on Gang of Disc Harrows:
- Assertion (A): Concave end of the disc harrow gang tends to penetrate more deeply than the convex end. $\implies$ True.
- The soil side forces acting on disc faces create a couple that tilts the gang, causing the outer concave end to dig in deeper while the convex end tends to ride out of the soil.
- Reason (R): The radial force, which includes the vertical support force on the disc blade, must pass slightly to the rear of the disc centerline. $\implies$ True.
- Due to soil resistance and forward travel velocity, the resultant radial reaction shifts slightly rearward of the vertical center axis.
- Relationship: Reason (R) describes longitudinal force line of action on an individual blade, but does not provide the causal explanation for gang-level moments across the width.
- Conclusion: Both (A) and (R) are true but (R) is NOT the correct explanation of (A) (Option 2).
Correct option: (2) Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →