Which outcome occurs when the 'clack valve' fails in a Newcomen steam engine during its power stroke?

💡 Explanation

When the clack valve fails, the condensing water cannot enter the cylinder because the vacuum can't be broken, causing pressure to build due to continuous steam input and potentially exceeding design limits. Therefore, increased pressure occurs, rather than vacuum collapse, overcooling, or increased fuel consumption, which require different valve malfunctions.

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