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HCCI and PPC Test Questions with Correct Answers CA$19.07   Add to cart

Exam (elaborations)

HCCI and PPC Test Questions with Correct Answers

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  • HCCI And PPC

HCCI and PPC Test Questions with Correct Answers Comparison with conventional diesel - Answer-Luminous yellow flame in conventional mode (sootradiation), Almost blue flame in MK mode (more premixed) load limit for Nissan MK - Answer-Fuel injection should be finished before autoignition, positi...

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  • August 21, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • HCCI and PPC
  • HCCI and PPC
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HCCI and PPC Test Questions with
Correct Answers

Comparison with conventional diesel - Answer-Luminous yellow flame in conventional
mode (sootradiation), Almost blue flame in MK mode (more premixed)

load limit for Nissan MK - Answer-Fuel injection should be finished before autoignition,
positive ignition dwell

in Nissan MK, there is an Extended ignition delay through - Answer-large amounts of
cooled EGR

shorter injection through - Answer-Higher injection pressure-Injector with high flow
number

challenges for modeling soot formation includes - Answer-3D modelling, turbulence
models and detailed chemistry

soot formation mainly depends on - Answer-local temp and equivalence ratio

Absence of soot is not explained by increased premixing since - Answer-equivalence
ratio-distribution similar in both cases

Lower combustion temperature affects - Answer-soot and NOx chemistry

drawbacks of PPC and Nissan MK - Answer-Limited load range, Need excessive EGR
levels, Poor combustion efficiency

Phasing HCCI combustion late helps - Answer-burn rate but reduces eta_comb

PPC is based on - Answer-increasing the ignition delay compared to a diesel engine

Reasoning behind low cetane fuels - Answer-If the aim is to extend the ignition delay,
why use a fuel that is designed to autoignite easily?

The first and second ignition: - Answer-at 60 CAD BTDC creates a homogeneous
mixture, Does not react during compression (due to EGR), The second around TDC
Triggers autoignition

By increasing EGR, the indicated efficiency - Answer-improves as a result of both a
decrease in heat transfer and exhaust loss.

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