Allied & ICAR Exam Bank • ALLIED_2978 MCQ • 1 Mark

Section 3: Farm Power

Sources of Power

Subtopic: Bio-fuels and their use in farm mechanization

Question Statement:

Raw non-edible vegetable oil (e.g. Jatropha, Pongamia) cannot be directly used in modern high-pressure common-rail diesel engines without modification primarily due to its:

Options:

  • (A) Extremely high kinematic viscosity causing poor atomization, injector coking, and piston ring sticking
  • (B) Lack of carbon content
  • (C) Excessive volatility causing early detonation
  • (D) High electrical conductivity

Answer Key:

A

Step-by-Step Solution & Explanation

Raw vegetable oils are $10-15\times$ more viscous than diesel, impairing spray droplet atomization and causing heavy carbon deposits.
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