Which outcome is most likely in a diesel engine when fuel cetane number is significantly below specification?

💡 Explanation

When fuel cetane number is low, ignition delay increases because the fuel's auto-ignition temperature is higher, leading to incomplete combustion during the expansion stroke. Therefore unburned hydrocarbon emissions increase, rather than elevated temperatures, reduced pressure, or injector coking, which are associated with different combustion problems.

• Which outcome occurs when hydraulic actuator velocity exceeds the control valve's maximum spool response rate?
• Which increased flight control instability results when an aircraft experiences flutter?
• Which outcome occurs when the evaporator coil in an industrial chiller plant develops ice buildup?
• Which mechanism causes a helicopter's tail rotor to lose effectiveness during landing in strong crosswinds?
• Which outcome occurs when forging die temperatures exceed the austenite recrystallization threshold?
• Which risk increases when impedance mismatches occur in a high-frequency transmission circuit?