- ✓ Fuel consumption and engine wear both increase
- B It improves performance and saves fuel
- C It has no effect on the engine
- D It reduces polluting emissions
Why this is the correct answer
If the idle speed is too high, both fuel consumption and engine wear increase. It must be correctly adjusted.
More questions on Vehicle Maintenance
- In an open (serviceable) battery, what should be used to keep the electrolyte above the plates?
- What is the function of the vehicle battery?
- Which component charges the battery while the engine is running?
- When you turn the ignition, the starter motor turns very slowly or not at all. What is the most likely cause?
- In a petrol engine, which component generates the spark that ignites the air-fuel mixture?
Practise this topic: 30 free questions, save your progress
Ready to pass the DGT theory test?
Practise official-format questions in English, with explanations after every answer and full progress tracking.
Try a free practice test