Step 3 » GENERAL learning environment Category D (D, D1, Tb, Tv)

GENERAL Learning Environment Category D (D, D1, Tb, Tv)
Question 47 of 485

Which of the valves of the distribution mechanism wear out faster?

A the intake valves;
B the exhaust valves;
C both valves wear out the same in the case of a well‑maintained engine.

Explanation

Explanation text category D / driving tests drpciv:
The exhaust valves are subjected to high temperatures because of the hot exhaust gases and therefore they wear out faster than the intake valves. Besides the high temperature, the exhaust gases also have many harmful substances that "attack" the exhaust valves over time, unlike the intake valves which come into contact with clean air.
Correct answer: B
 
Driving tests drpciv category D explained.

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