单项选择题

When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）

A.insufficient lubrication
B.improper piston cooling
C.blow-by
D.overload operation

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单项选择题

Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）

A.has a crown-face
B.exceeds wear limits through normal wear
C.has excessive blow-by
D.is in good condition

单项选择题

A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）

A.combustion gas blow-by
B.excessive lubrication
C.properly functioning rings
D.insufficient cylinder cooling

单项选择题

Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine? （）

A.Blank off the exhaust gas inlet to the damaged turbocharger
B.Secure cooling and lubrication to the damaged turbocharger
C.Lock the rotor of the damaged turbocharger
D.All of the above