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

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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

单项选择题

Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）

A.Poor combustion
B.High cylinder oil consumption
C.Leaking exhaust valves
D.All of the above