In a diesel engine, a leaking exhaust valve...

Question 1 / 270705eccefa1bacbc34ba4d476ab

Question 1 of 270705eccefa1bacbc34ba4d476ab

In a diesel engine, a leaking exhaust valve can cause _________.

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Question 1 of 27070

Q

In a diesel engine, a leaking exhaust valve can cause _________.

🔍 Key Concepts

• four-stroke diesel cycle (intake, compression, power, exhaust) • function and timing of an exhaust valve • difference between combustion problems vs gas-flow (scavenging) problems

💭 Think About

• Think about when the exhaust valve is supposed to be closed and what happens inside the cylinder if it leaks during compression or power stroke. • Would a leaking exhaust valve mainly affect how fresh air enters the cylinder, how exhaust gases leave, or how the fuel-air mixture burns? • Which choice relates to gases escaping past the valve rather than to the fresh charge being pushed in or pulled out?

✅ Before You Answer

• Be clear on what scavenging means: replacement of exhaust gas by fresh air or mixture. • Decide whether a leaking exhaust valve would more likely disturb combustion timing or pressure in the cylinder during firing. • Check which option is most directly caused by loss of compression and hot gases leaking through the exhaust valve.

Question 1 of 27070

Q

In a diesel engine, a leaking exhaust valve can cause _________.

A

misfiring

B

pre-ignition

C

interrupted scavenging

D

reduced scavenging

Question 1 / 270705eccefa1bacbc34ba4d476ab

Question 1 of 270705eccefa1bacbc34ba4d476ab

In a diesel engine, a leaking exhaust valve can cause _________.

Back

Question 1 of 27070

Q

In a diesel engine, a leaking exhaust valve can cause _________.

🔍 Key Concepts

• four-stroke diesel cycle (intake, compression, power, exhaust) • function and timing of an exhaust valve • difference between combustion problems vs gas-flow (scavenging) problems

💭 Think About

• Think about when the exhaust valve is supposed to be closed and what happens inside the cylinder if it leaks during compression or power stroke. • Would a leaking exhaust valve mainly affect how fresh air enters the cylinder, how exhaust gases leave, or how the fuel-air mixture burns? • Which choice relates to gases escaping past the valve rather than to the fresh charge being pushed in or pulled out?

✅ Before You Answer

• Be clear on what scavenging means: replacement of exhaust gas by fresh air or mixture. • Decide whether a leaking exhaust valve would more likely disturb combustion timing or pressure in the cylinder during firing. • Check which option is most directly caused by loss of compression and hot gases leaking through the exhaust valve.