Which of the following is the expression for determination of calorific value of coal using Davies formulae? (where CV is calorific value, %H is percentage of hydrogen, %C is percentage of carbon, %O is percentage of oxygen and %S is percentage of sulphur.) b) CV = (6.543×%H + 403) c) CV = (6.543×%H – 403) d) CV = (6.543×%H – 403)
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