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Which condition cracks a filter substrate?

  • A.An uncontrolled regeneration of an overloaded filter
  • B.Normal regeneration, which raises the temperature to six hundred degrees and therefore stresses the substrate
  • C.Cold weather
  • D.A runaway burn releasing more heat than the substrate can conduct away, producing thermal stress beyond its strength

Answer: A

An overloaded filter can run away and destroy itself. The last option explains exactly that mechanism, which makes it a correct and more instructive version. Controlled regeneration is designed not to. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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