Question

An increase in 1% of percentage of oxygen decreases the calorific value by ________

(a) 1.7%

(b) 2.7%

(c) 3.7%

(d) 4.7%

I had been asked this question by my school teacher while I was bunking the class.

My question comes from Analysis of Coal and Selection in division Fuel Technologies of Applied Chemistry

Answer 1

Correct answer is (a) 1.7%

Easy explanation: The increase in 1% of oxygen results in a decrease of 1.7% of calorific value. So, always good fuel must contain less amount of oxygen.