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3 ptsD,D1Official number: 6904

While driving a bus, which of the following activities should be performed in order to achieve the highest efficiency of braking with the engine?

While driving a bus, which of the following activities should be performed in order to achieve the highest efficiency of braking with the engine?
Explanation

Correct answer: If possible engage the lowest gear.

Engine braking involves utilising the internal resistance of the engine to reduce the vehicle's speed, without using the service brake. The effectiveness of this manoeuvre is greater at higher engine speeds. Engaging the lowest possible gear appropriate for the speed causes an increase in engine speed and thus generates the greatest braking force.

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