Modern fuel oil temperature control devices are regulated to obtain a desired viscosity rather than a specific fuel oil temperature because __________.
• Viscosity vs. temperature behavior of different fuel oils • How residual fuels from different refineries can differ in properties • Why automatic systems control viscosity, not just heater temperature, for proper atomization
• Think about what the burner/engine really needs for good combustion: is it a fixed temperature, or a certain flow/atomization quality of the fuel? • Ask yourself whether all residual fuels behave the same way when heated, or if their viscosity–temperature curves can differ. • Consider which choice describes a fundamental, physical reason related to fuel properties, not an operational convenience.
• Check which option refers to a fundamental property of fuels (how viscosity changes with temperature). • Eliminate any option that claims all residual fuels are the same regardless of source—verify if that sounds realistic. • Be wary of answers that say a control system eliminates the need for some other important combustion control, such as fuel/air ratio.
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