Allied & ICAR Exam Bank • ALLIED_0279 NAT • 2 Marks

Section 3: Farm Power

Farm Power

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

Question Statement:

A diesel fuel injector nozzle has 4 spray holes, each of diameter $0.25\text{ mm}$. The total flow area of the nozzle orifice in $\text{mm}^2$ is (rounded off to three decimal places):

Answer Key:

0.196

Step-by-Step Solution & Explanation

Area per hole $= \frac{\pi}{4} (0.25)^2 = 0.049087\text{ mm}^2$. Total area $= 4 \times 0.049087 = 0.19635\text{ mm}^2 \approx 0.196\text{ mm}^2$.
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