Question Bank • QB_FP_ADV_027 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Lubricants and their properties

Question Statement:

In the multigrade engine oil designation 'SAE 15W-40' used in agricultural tractors, the letter 'W' denotes:

Options:

  • (A) Weight
  • (B) Winter (low-temperature viscosity rating)
  • (C) Wattage
  • (D) Wear-resistance

Answer Key:

B

Step-by-Step Solution & Explanation

- In SAE J300 multigrade viscosity classifications, 'W' stands for **Winter**. - The number preceding 'W' (15W) indicates cold-cranking and pumpability viscosity limits at sub-zero temperatures (down to $-20^\circ\text{C}$). - The suffix number (40) indicates the kinematic viscosity range at engine operating temperature ($100^\circ\text{C}$).
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