Discussion
Assertion (A): False air entering through worn kiln seals increases fuel consumption.
Reason (R): The leaked air must be heated to kiln temperature without contributing to combustion.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Air leaking in through a worn seal is heated to whatever temperature it reaches before leaving with the exhaust, and it takes that heat with it. It contributes nothing to combustion, since it enters downstream of the flame, so the fuel that heated it is simply lost.
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