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Which feature delays the extinguishing of interior lamps?

  • A.A theatre dimming or delay circuit
  • B.A capacitor across the lamp, which discharges slowly and therefore keeps the lamp illuminated after the door closes
  • C.A relay
  • D.A control unit that keeps the lamp lit until the ignition is switched on, which assists the occupants during boarding

Answer: A

A body controller fades the lamps out over a few seconds after the doors close. Keeping them lit until the ignition is switched on genuinely is part of many strategies, which makes the last option a real behaviour of the same system. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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