Question

Diameter and stroke length of the piston of a 4 stroke-4-cylinder diesel engine are 10 cm and 12 cm respectively and speed of crank shaft is 2000 rpm. Calculate brake power.

(a) 18.90 KW

(b) 12.89 KW

(c) 12.98 KW

(d) 18.98 KW

I had been asked this question during an interview.

Asked question is from I.C Engine topic in chapter Internal Combustion Engine of Farm Machinery

Answer 1

The correct answer is (d) 18.98 KW

To explain I would say: Integrated power = \((\frac{pLAN}{60,000})\)*n/2

= \(\frac{7*105*0.12*\frac{π}{4}*(0.1)2*2000*4}{60000*2}\)

= 43.98 KW

Brake power = Integrated power – Frictional power

= 43.98-25

= 18.98 KW.