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

GENERAL Learning Environment Category D (D, D1, Tb, Tv)
Question 46 of 485

In the case of compression-ignition engines, the emission of black colour smoke is a consequence of:

A the incorrect adjustment of the injection pump;
B the wear of the piston rings;
C the small clearance between the valves and the tappets.

Explanation

Text explanation category D / driving tests drpciv:
In the case of compression-ignition engines, the emission of black colour smoke is a consequence of the incorrect adjustment of the injection pump. The misadjusted injection pump can send too much diesel fuel to the cylinders and black colour smoke appears at the exhaust, due to the unburnt diesel fuel.
Correct answer: A
 
Driving tests drpciv category D explained.

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