Which risk increases when the wastegate in a turbocharged diesel engine fails closed during high load operation?

💡 Explanation

When the wastegate fails closed under high load, the turbocharger continues to increase boost pressure because it's not being bypassed, possibly causing over-boost and high cylinder pressures/temperatures, raising thermal stress. Therefore excessive cylinder head thermal stress increases, rather than lean mixture or other failure which doesn't involve high temps.

• Which risk significantly increases during the post-tensioning process of a concrete bridge deck when grout density is insufficient?
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