The fuel ratio of a coal is
(A) The ratio of its percentage of fixed carbon to that of volatile matter
(B) Helpful in estimation of its rank
(C) Both (A) and (B)
(D) Neither (A) nor (B)
(A) The ratio of its percentage of fixed carbon to that of volatile matter
(B) Helpful in estimation of its rank
(C) Both (A) and (B)
(D) Neither (A) nor (B)