Discussion
Statement I: Effusion cooling has displaced simple film slots on modern combustors.
Statement II: Rising turbine entry temperatures leave less air available for wall cooling.
In the light of the above statements, choose the correct answer.
Answer: B
Both statements are true and the second is the reason. Many small holes distribute the same protection using less air than a few large slots, which frees flow for the primary and dilution zones where it is increasingly needed.
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