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Difficulty: MediumCausal Detail Extraction

Read the following passage about diesel generator maintenance:

During routine testing, backup diesel generators often operate under minimal electrical loads. When engines run below 30 percent capacity for extended periods, cylinder combustion temperatures fail to reach the threshold required for complete fuel ignition. Consequently, unburned fuel mixes with soot and accumulates along the exhaust manifold, forming a thick deposit known as wet stacking. Because this viscous accumulation coats the internal exhaust valves, the engine suffers from restricted airflow and reduced mechanical output. Over time, the resulting backpressure buildup causes severe thermal stress across the turbocharger turbine. To eliminate these deposits and restore proper exhaust flow, maintenance crews connect an external load bank to force sustained high-temperature combustion.

Match each stated operational cause with its direct physical consequence described in the passage.

  • Running the engine below 30 percent capacityFailure of cylinder temperatures to reach the complete fuel ignition threshold
  • Viscous deposits coating internal exhaust valvesRestricted engine airflow and decreased mechanical output
  • Long-term accumulation of exhaust backpressureSevere thermal stress across the turbocharger turbine
  • Connecting an external load bank to the generatorElimination of manifold deposits and restoration of exhaust flow

Answer

Each cause pairs directly with its stated effect: running below 30% capacity results in combustion temperatures failing to reach complete ignition threshold; deposits coating valves result in restricted airflow and reduced mechanical output; backpressure buildup results in severe thermal stress on the turbocharger; and connecting an external load bank results in eliminating deposits and restoring exhaust flow.
Each match strictly reflects explicit cause-and-effect relationships stated in the passage: low load causes low combustion temperatures; coated valves cause airflow restriction and power loss; backpressure causes turbocharger thermal stress; and applying a load bank causes deposit removal and flow restoration.

Step-by-Step Solution

1
Locate explicit causal transition markers in the text (such as 'When', 'Consequently', 'Because', and 'To').
Identified four discrete cause-and-effect relationships corresponding to each sentence of the technical description.
Causal detail extraction requires isolating explicit relational markers rather than inferring unstated outcomes.
2
Pair each isolated operational action or condition with its explicitly stated immediate physical result.
Matched each left-hand condition directly to its corresponding right-hand consequence without transposing cause and effect.
Prevents causal inversion and ensures each mechanical mechanism aligns with text evidence.

Key Concept

Causal Detail Extraction
Estimated Time:1m 15s
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Causal Detail Extraction

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