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Which pressure does a sealed tank system tolerate?

  • A.Very high pressure
  • B.A limited overpressure controlled by relief and vacuum valves, which protect the tank from either extreme
  • C.A modest pressure managed by valves
  • D.Atmospheric pressure only, since any pressure would rupture the tank and is therefore prevented by venting

Answer: C

Relief and vacuum valves keep the tank within its design limits. The last option explains exactly that protection, which makes it a correct and more detailed version. Hybrid vehicles use higher pressures. 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. Naming what changes and what stays the same is the reliable route through questions of this shape.

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