Question

What is the viscosity index for an oil having viscosity = 100s at 38°C? (L=137.9; H=107.1)

(a) 132.38

(b) 285.38

(c) 120.06

(d) 122.72

I have been asked this question during an internship interview.

My doubt stems from 4-Stroke Engine Vs. 2-Stroke Engine in division Internal Combustion Engine of Farm Machinery

Answer 1

Correct choice is (d) 122.72

For explanation I would say: V.I. = \(\frac{L-U}{L+U}\)*100

= \(\frac{137.9-100}{137.9-107.1}\)*100

= 122.72.