單項選擇題If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.

A.open air-box drains
B.loss of cooling water to the diffuser
C.gradual fouling of the air filters
D.improperly timed exhaust valves


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題The most common cause of scale formation in an auxiliary boiler is （）

A.concentrations of calcium sulfate in the boiler water
B.fuel oil in the feed water
C.improper treatment of the feed water with calcium sulfate
D.excessive feed water alkalinity

2.單項選擇題For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）

A.High oxygen concentration
B.Low pH
C.Proper alkalinity
D.All of the above

4.單項選擇題An indication of a diesel engine air intake being partially clogged, is （）.

A.low firing pressure and low exhaust temperatures
B.low firing pressure and normal exhaust temperatures
C.high firing pressure and low exhaust temperatures
D.high firing pressure and high exhaust temperatures

5.單項選擇題The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.

A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure