Question

A four-stroke diesel engine operating at 1200 rpm uses 0.1 kg of fuel in 5 minutes and develops a torque of 7.5 kg-m. What is the brake specific fuel consumption.

(a) 0.2810 kg/BHP/h

(b) 0.1910 kg/BHP/h

(c) 0.1886 kg/BHP/h

(d) 1.1010 kg/BHP/h

The question was posed to me in final exam.

This is a very interesting question from Fuel Supply System in chapter Fuel Supply and Cooling System of Farm Machinery

Answer 1

The correct choice is (b) 0.1910 kg/BHP/h

To explain I would say: BHP = \(\frac{2πpT}{4500} = \frac{2π*600*7.5}{4500} \)

BHP = 6.28 hp

Brake specific fuel consumption = \(\frac{0.1}{6.28}*\frac{60}{5}\) = 0.1910 kg/BHP/h