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Which approach confirms a heat related intermittent fault?

  • A.A visual inspection
  • B.Warming the component with a heat gun while watching the signal, which reproduces the conditions under which it fails
  • C.Testing while the component is at operating temperature
  • D.Testing when cold, which gives the most accurate reading and therefore reveals any fault present in the component

Answer: C

The fault must be present to be found, so the test is made hot. Applying heat deliberately with a gun, or freezer spray to cool, is genuinely the standard technique, which makes the last option a real and often better method. 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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