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Piston Engine Operation




1.What engine problem can be identified by blue exhaust smoke?
Rich mixture.
Coolant leak.
Worn valve guides.
None of the above.


2.A coolant leak is identified by black smoke.
True.
False.


3.Carbon deposits inside the cylinder can decrease the compression ratio.
True.
False.


4.When compression ratios are too high, the air/fuel mixture:
Is rich.
Is weak.
Remains the same.
May self-ignite.


5.Rags that have been soaked with gasoline pose little risk in the automotive repair facility.
True.
False.

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