更多"A diesel engine crankcase ventilati"的相关试题:
[单项选择]When fuel enters the crankcase of a diesel engine, it （）
A. dilutes the lube oil and reduces its viscosity
B. forms sulfuric acid in the lube oil
C. causes pitting and failure of the bearings
D. causes sludge deposits on valve stems
[单项选择]If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）
A. Open the crankcase immediately to check for damage
B. Apply fire fighting water through the crankcase breather
C. Allow the engine to cool before opening the crankcase
D. Assume that there is no damage to the crankshaft
[单项选择]An increase in diesel engine crankcase pressure generally indicates excessive（）
A. compression pressure
B. lube oil header pressure
C. scavenge air pressure
D. piston ring blow-by
[单项选择]
With regards to a diesel engine crankcase explosion, the most violent is the（）
(1) primary explosion
(2) secondary explosion
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) or (2)
[单项选择]Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）
A. free entry of air to the crankcase
B. water entering the crankcase while engine wash-downs are being performed
C. excessive oil leakage during periods of increased blow-by
D. sub-cooling internal components
[单项选择]The most common diesel engine fuel system problems are caused by （）.
A. incorrect adjustments
B. dirty fuel
C. broken fuel lines
D. excessive vibration
[单项选择]In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）
A. increased engine back pressure
B. sulfuric acid corrosion
C. surface pitting of the turbocharger
D. moisture impingement on the turbocharger compressor blade
[单项选择]In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
A. raw water pump discharge
B. expansion tank outlet
C. cooling water heat exchanger
D. outlet engine jacket water outlet
[单项选择]Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
A. back clearance
B. side clearance
C. gap clearance
D. taper clearance
[单项选择]The blower type crankcase ventilation system （）
A. removes combustible gases in the crankcase
B. prevents the formation of combustible gases in the crankcase
C. cools lubricating oil
D. improves cold weather starting
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
[单项选择]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
A. slight acidity
B. slight alkalinity
C. excessive alkalinity
D. excessive acidity
[单项选择]In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A. slightly acidic condition
B. slightly alkaline condition
C. overtreatment of water
D. neutral condition of water
[单项选择]In a diesel engine lube oil system, which of the following parts should be lubricated first?（）
A. Camshaft beatings
B. Main bearings
C. Piston crowns
D. Cylinder walls
[单项选择]The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）
A. provide exhaust back pressure
B. prevent exhaust smoke emissions
C. power a reciprocating supercharger
D. muffle exhaust gas noise
[单项选择]The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.
A. fuel treatment
B. fuel combustion
C. fuel injection
D. fuel separating
[单项选择]Dirt in the fuel oil system of a diesel engine can cause （）.
A. clogged filters
B. poor combustion
C. overloading of the diesel
D. shock of fuel lines
