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GENERAL Learning Environment Category B (B, B1)

Question 308 of 1208

Which of the variants below represent qualities of an engine oil?

A the colour;

B the viscosity;

C the freezing point.

See explanation

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Explanation

For answer A

The colour of the oil is not a relevant criterion for its quality or lifespan. A new oil can be yellowish, if it is mineral, or reddish, if it is synthetic with certain additives. Thus, regardless of whether it is yellowish or reddish, the colour does not represent a quality and does not influence in any way the functioning of the engine. Over time, regardless of the initial colour, it can darken due to the accumulation of impurities and normal usage processes, but this does not automatically indicate that it must be changed or that it can still be used for a certain number of kilometres.

For answer B

The engine oil must have an optimal viscosity, which allows the easy rotation of the crankshaft, for it to flow quickly enough and lubricate all the moving engine components. Therefore, the viscosity constitutes a quality of the engine oil.

For answer C

The engine oil must maintain its optimal viscosity even in winter, to allow the starting of the engine and the efficient lubrication of the engine components even at extremely low temperatures. Therefore, its freezing point must be at very low temperatures. Thus, the freezing point constitutes a quality of the engine oil.

The correct answer is: B and C

Recommendations:

Mechanics course (knowledge of main elements) --> Mechanics course

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