Question Bank • QB_FP_039 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Lubricants and their properties

Question Statement:

In the SAE viscosity designation 'SAE 15W-40' for multi-grade agricultural tractor engine oil, the prefix '15W' designates:

Options:

  • (A) Low-temperature winter ('W') viscosity rating for cold-cranking and pumpability
  • (B) The oil contains 15% water-based additive emulsion
  • (C) Kinematic viscosity measured at 150°C
  • (D) A maximum allowable operational life of 15 weeks

Answer Key:

A

Step-by-Step Solution & Explanation

The 'W' stands for 'Winter'. SAE 15W designates the low-temperature viscosity limit for engine cold-cranking and oil pumpability down to -20°C, whereas '40' indicates the high-temperature kinematic viscosity rating at 100°C.
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