Question

Calculate the time and power for sowing four hectares of and by a 7-furrow seed drill, going 6 cm deep. The speed of the seed drill is 4 km/hour and the pressure exerted by soil on the seed drill is 0.42 kg/cm^2. The spacing between the two furrow openers is 15 cm. Loss of turning is 5%.

(a) 14 hours, 2 HP

(b) 11 hours, 3.46 HP

(c) 10 hours, 1.82 HP

(d) 8 hours, 3.11 HP

I have been asked this question during an interview.

Asked question is from Sowing Equipments topic in section Sowing Equipments of Farm Machinery

Answer 1

The correct answer is (c) 10 hours, 1.82 HP

To elaborate: W = 7*15 = 1.05 m

Linear distance covered for 4 hectares = \(\frac{4*10000}{1.05}\) = 38.095 km

Time taken to travel 38.095 km = \(\frac{38.095}{4}\) = 9.52 hours

Gross time taken = 9.52 + 9.52*\(\frac{5}{100}\) = 10 hours

Each furrow section = 7*6 = 42 cm^2

Area covered by all furrows = 7*42 = 294 cm^2

Total draft = 294 * 0.42 = 123.48 kg

Total power required = \(\frac{123.48*4*1000}{75*60*60}\) = 1.82 HP.