Which of the following is TRUE?____.
A: If there is oxygen and fuel in an enclosed tank, there must be an explosion.
B: Crankcase explosion is least likely to occur, because there is no air in crankcase.
C: The droplets of lubricating oil splashing around in the crankcase is usually too large to start burning.
D: The oil/air concentration in crankcase is usually too rich.
A: If there is oxygen and fuel in an enclosed tank, there must be an explosion.
B: Crankcase explosion is least likely to occur, because there is no air in crankcase.
C: The droplets of lubricating oil splashing around in the crankcase is usually too large to start burning.
D: The oil/air concentration in crankcase is usually too rich.
举一反三
- If a crankcase explosion occurs in a diesel engine, you should stop the engine and（） A: immediately open all crankcase relief ports B: increase crankcase exhauster speed to draw cool air into the engine C: allow the engine to cool naturally D: increase crank case scavenge air to remove unburned gase
- Which of the following is FALSE?____. A: The most common cause of a localized hotspot is due to friction. B: When the concentration of oil mist reaches about 13% oil mist (oxygen ratio), it is at its lower explosive limit. C: Tests have shown that it is necessary for a temperature of more than 800C to ignite oil mist in a crankcase under operating conditions. D: Many<br/>causes including external fire may result in crankcase explosion.
- In a normally operating diesel engine， the main cause of lubricating oil contamination in the crankcase is a result of the （）.
- In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（） A: lubricating oil B: dry sump C: circulated tank D: wet sum
- Oil pan (see Fig.3-5) is a container mounted at the bottom of the crankcase which serves as engine oil storage．