Allied & ICAR Exam Bank • ALLIED_0269
MCQ • 1 Mark
Section 3: Farm Power
Farm Power
Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
Common Rail Direct Injection (CRDI) systems in modern agricultural tractors provide superior fuel economy and low emissions because:
Options:
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(A) Fuel rail pressure is maintained extremely high ($1500 - 2000\text{ bar}$) independent of engine speed, enabling multi-stage electronically controlled injection pulses
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(B) They eliminate all fuel filters
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(C) They mix fuel with coolant
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(D) They operate without injectors
Step-by-Step Solution & Explanation
CRDI maintains rail pressure constantly high, allowing electronic ECUs to time pilot, main, and post injections precisely.
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