Question 304Motor Plants - Assistant Engineer

The correct answer is B) 203°F to less than 212°F. This temperature range is typically required for the contaminated fuel oil fed to a centrifuge in order to reduce the oil's viscosity and facilitate the separation of contaminants. Operating the centrifuge within this temperature range helps ensure optimal performance and efficiency in the purification process. The other options are incorrect because: A) 160°F to 180°F may be too low to achieve the necessary viscosity reduction, C) greater than 212°F could lead to excessive vaporization, and D) selecting the temperature based solely on the viscosity index would not account for other factors that influence the optimal operating temperature.