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Difficulty: EasyExhaust Emissions and Noise Abatement

Which driving technique helps reduce both vehicle exhaust emissions and engine noise levels?

  1. A
    Coast with the clutch pedal held down when approaching junctions
  2. Accelerate smoothly and change to higher gears as early as possible without labouring the engineAnswer
  3. C
    Stay in lower gears to keep engine revolutions high while cruising
  4. D
    Apply firm acceleration followed immediately by heavy braking between hazards

Answer

Accelerating smoothly and changing up to a higher gear as early as possible without labouring the engine reduces both emissions and noise.
Accelerating smoothly and changing up to higher gears early keeps the engine operating at lower revolutions per minute (rpm). Lower engine speeds require less fuel, producing fewer toxic exhaust emissions and significantly quieter operation.

Step-by-Step Solution

1
Identify the factors that increase vehicle emissions and noise
High engine speed (rpm) and aggressive acceleration significantly raise fuel consumption, toxic exhaust gases, and sound output.
Internal combustion engines burn more fuel and generate greater mechanical and exhaust noise under high load and high rpm.
2
Select the eco-safe driving method that keeps engine speed moderate and consistent
Smooth acceleration combined with early gear shifting maintains lower engine speeds and smoother power delivery.
This technique uses the vehicle's momentum efficiently and maintains lower combustion frequency, directly abating noise and emissions.

Key Concept

Eco-safe driving techniques for exhaust emissions reduction and noise abatement
Estimated Time:45s
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Topics

Exhaust Emissions and Noise Abatement

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