A single-acting disc harrow has five discs per gang and gang angle20°. At3 km/hour and 10 cm depth, the horizontal soil reaction parallel to each disc face is 250 N. Find drawbar power in kW, to two decimals.
A single-acting harrow has two gangs, so ten discs. Resolve the supplied face-parallel force along travel using $\cos20^\circ$. Total longitudinal draft is $10(250)\cos20^\circ=2349.23$ N. Speed is 3/3.6=.833333 m/s. Power is $2349.23(.833333)/1000=\mathbf{1.96}$ kW. The stated reaction already corresponds to the working depth.
More Farm Machinery questions
GATE 2024 AG Q50– A rotary mower has 1.2 m swath at 5 km/hour. Friction losses are1.5 kW per metre swath and…
GATE 2024 AG Q54– A boom sprayer has 12 nozzles at 50 cm spacing, speed 3.5 km/hour, initial nozzle…
GATE 2023 AG Q15– Rotary-tiller total tillage energy decreases when
GATE 2023 AG Q17– Thresher cylinder separation efficiency can be improved by increasing