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Which measurement detects such a failure?

  • A.The differential pressure, which rises when the substrate has cracked and the gas bypasses the walls entirely
  • B.Nothing
  • C.Particle counting, since a cracked filter passes particles freely while its pressure drop may look entirely normal
  • D.A particle number count at the tailpipe

Answer: D

Pressure alone cannot distinguish a cracked filter from a clean one. The last option explains exactly that limitation, which makes it a correct and more instructive version. Particle counting was introduced for this. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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