Question

A tractor is attached with a 9-tine cultivator. While field testing, drawbar dynamometer shows an average pull of 14000 N. the speed of tractor is 6 km per hour. Find the power of the tractor.

(a) 24 KW

(b) 25 KW

(c) 21.67 KW

(d) 23.33 KW

The question was posed to me in an interview for internship.

This intriguing question comes from Cultivators in chapter Harrows, Cultivators and Intercultural Implements of Farm Machinery

Answer 1

Right answer is (d) 23.33 KW

Easy explanation: Speed: \(\frac{6*1000}{60*60}=\frac{10}{6}\)m/s

Pull = 14000 N

Power = Pull * Speed

= 14000 * 10/6 N.m/s

= 23333.33 N.m/s

= 23333.33 Watts

= 23.33 KW.