Question 156Motor Plants - 1st Asst/Chief
70% to passClearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished _______________.
Awith only the exhaust valve open
Bwithout cooling the cylinders or pistons
Cat a pressure below atmospheric
Dduring the valve overlap period
AI Explanation
The correct answer is D) during the valve overlap period. Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished during the valve overlap period, when both the intake and exhaust valves are open. This allows the fresh air charge from the turbocharger to flow through the cylinder, displacing the exhaust gases and improving the engine's volumetric efficiency. The other options are incorrect because: A) only the exhaust valve open would not allow for scavenging, B) scavenging occurs without cooling the cylinders or pistons, and C) scavenging occurs at a pressure above atmospheric due to the turbocharger.
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