Allied & ICAR Exam Bank • ALLIED_0267 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust

Question Statement:

The thermostat valve in a liquid-cooled tractor diesel engine functions to:

Options:

  • (A) Block coolant flow to the radiator until the engine reaches normal operating temperature ($80-85^\circ\text{C}$)
  • (B) Regulate oil pressure to the main bearings
  • (C) Advance fuel injection timing
  • (D) Cut off fuel during idling

Answer Key:

A

Step-by-Step Solution & Explanation

The thermostat ensures rapid warmup to minimize cylinder bore wear and maintains coolant around $82-85^\circ\text{C}$.
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