Question Bank • QB_SUB_FP_LUB_002 MSQ • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Lubricants and their properties

Question Statement:

In a multigrade diesel crankcase oil designated as SAE 15W-40, which of the following statements are CORRECT?

Options:

  • (A) '15W' specifies the low-temperature dynamic viscosity and cold-crank capability at winter temperatures
  • (B) '40' specifies the high-temperature kinematic viscosity range at 100°C
  • (C) The oil behaves like an SAE 15 grade at 100°C
  • (D) Viscosity index improver polymer additives allow the multigrade performance

Answer Key:

A, B, D

Step-by-Step Solution & Explanation

SAE 15W-40 meets cold cranking limits at winter temperatures (15W) and maintains protective film viscosity of SAE 40 at 100°C using polymeric viscosity index improvers.
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