Question 88Motor Plants - 1st Asst/Chief

The correct answer is B) Use blotter paper with a single concentric drop of 'old' and 'new' fuel, if they do not form separate circles, the fuels may be deemed compatible. This is the correct answer because this simple on-board test can quickly determine the compatibility of the 'old' and 'new' fuels without the need for sophisticated equipment. If the two fuel drops on the blotter paper form a single, homogeneous circle, it indicates that the fuels are likely compatible and can be safely blended. The other options, while potentially valid tests, are more complex and may not be as easily performed on-board during the bunkering process. The other answer choices are incorrect because they either require elevated temperatures (A and C), which may not be practical on-board, or rely on a viscosity test (D), which is a more detailed laboratory analysis rather than a quick on-board compatibility check.