During a power outage, a semi-conductor manufacturing plant is likely to exhibit which cost of downtime profile?

Question

Options

• ACost of downtime per hour remains the same.
• BCost of downtime per hour increases with time.
• CCost of downtime per hour decreases with time.
• DCost of downtime per hour is exponential with time.

• A
  6% (1)
• B
  6% (1)
• C
  76% (13)
• D
  12% (2)

Explanation

Semiconductor fabs suffer their greatest losses in the first moments of a power outage: in-progress wafers (often representing weeks of work and hundreds of thousands of dollars) are immediately scrapped, ultra-pure cleanroom environments are compromised, and equipment like chemical vapor deposition chambers can be damaged by abrupt shutdown. Once those instantaneous losses are realized, the ongoing hourly cost drops to basic idle expenses - labor, some utilities, lost opportunity - which are significantly lower than the initial hit, making the per-hour cost decrease over time (C).

Why the distractors are wrong:

• A (constant): Ignores the dramatic spike at outage onset; costs are clearly not uniform across hours.
• B (increasing): This fits industries where damage accumulates with time (e.g., perishable food spoilage or refrigerated pharmaceuticals) - the opposite of semiconductor manufacturing's front-loaded loss model.
• D (exponential): Exponential growth implies losses accelerate over time, which contradicts the reality that the worst damage occurs immediately and subsequent hours are comparatively cheaper.

Memory tip: Think of it as a car crash vs. a gas leak. A semiconductor outage is like a car crash - the damage is done at impact, and sitting still afterward costs little extra. Exponential/increasing profiles are like a slow gas leak - the damage grows the longer it goes on.

No community discussion yet for this question.