Question

5 multiple choice 1 point
which brake fluid will not harm plastic surfaces?
○ dot 5.1
○ dot 2
○ dot 5
○ dot 3

6 multiple choice 1 point
an excessive amount of ______ exhaust smoke indicates worn piston rings.
○ black
○ purple
○ blue
○ white

Explanation:

Question 5

DOT 5 brake fluid is silicone - based, while DOT 3, DOT 2, and DOT 5.1 are glycol - based. Glycol - based brake fluids can damage plastic surfaces, but silicone - based DOT 5 does not harm plastic surfaces.

Worn piston rings allow engine oil to enter the combustion chamber. When oil burns, it produces blue exhaust smoke. Black smoke is usually due to unburned fuel, white smoke can be from coolant burning, and purple smoke is not a typical indicator of worn piston rings.

Answer:

C. DOT 5

Question 6