Step 3 » GENERAL learning environment Category C (C, C1)

GENERAL Learning Environment Category C (C, C1)
Question 56 of 533

In the case of compression-ignition engines, the emission of black-coloured smoke is a result 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.
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Explanation

Explanation text category C / driving tests drpciv:
In the case of compression-ignition engines, the emission of black-coloured smoke is a result of the incorrect adjustment of the injection pump. The misadjusted injection pump can send too much diesel to the cylinders and black-coloured smoke appears at the exhaust, due to unburned diesel.
Correct answer: A
 
Driving tests drpciv category C explained.

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