Question

What is the regulation of speed when speed at no load of engine is 1973 rpm and speed at load is 1873 rpm?

(a) 5.20%

(b) 4.80%

(c) 5.12%

(d) 4.56%

The question was asked in class test.

This question is from Working Principles of I.C Engine in chapter Internal Combustion Engine of Farm Machinery

Answer 1

Correct choice is (a) 5.20%

To explain: N1 = 1973; N2 = 1873

∆N = N2-N1

∆N = 1973-1873 = 100rpm

 N = N2-N1/2

 N = 1973+1873/2

= 1923

Regulation of speed = ∆N/  N

                                    = 100/ 1923

                                    = 0.0520

                                    = 5.20%.