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

相关考题

A bright shiny appearance of the sealing surfaces on di...

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

Following the failure of one turbocharger on a large, c...

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

Which of the following conditions may contribute to the...

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

船舶电气与船舶安全

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（）