Fuel oil is classified by :
a) Viscosity and temperature of combustion
b) Source of origin and API standards
c) Source of origin and heating value
d) Specific gravity and heating value
Option (b) is correct
Fuel oil is classified as (I) Distillate fuel oil (ii) residual fuel oil
In ASTM , ( American society for testing and material) Grade number 1,2 are distillate and and 4, 6 are generally residual, 3 is mixutre of distillate and resudual
properties of fuel oil depends on Carbon chain length and distillation temperature
So option (b) is correct
Source of orgin ( distillate or resudual) and API standard ( Viscosity, boiling temperature, density)
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