Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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How does temperature affect the viscosity of oil?

  1. Viscosity increases with temperature

  2. Viscosity decreases with temperature

  3. Viscosity remains constant

  4. Viscosity fluctuates regardless of temperature

The correct answer is: Viscosity decreases with temperature

Viscosity is a measure of a fluid's resistance to flow, and it is influenced significantly by temperature. As the temperature of oil increases, the energy of the molecules within the oil also increases. This results in the molecules moving more freely and overcoming intermolecular forces that contribute to the fluid's viscosity. Consequently, as the temperature rises, the viscosity of the oil decreases, making it flow more easily. This relationship is particularly important in various applications involving oil, such as engines and machinery, where appropriate viscosity ensures optimal performance and lubrication. Understanding this concept helps in selecting the right type of oil for different operating temperatures, highlighting why the decrease in viscosity with rising temperature is the correct explanation in this context.

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