更多"A substantial increase in crankcase"的相关试题:
[单项选择]A substantial increase pressure could be an indication of a/an （）
A. worn cylinder liner
B. faulty cylinder relief valve
C. excessive lube oil pressure
D. excessive scavenge air pressure
[单项选择]An increase in crankcase pressure generally indicates（）
A. worn connecting rod bearings
B. worn engine cylinder liners
C. high cylinder firing pressure
D. stuck spring-loaded manhole covers
[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]An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.
A. decrease in maximum cylinder pressure
B. increase in ignition lag
C. decrease in fuel consumption per horsepower-hour
D. decrease in exhaust manifold pressure
[单项选择]Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.
A. reduce engine horsepower output
B. aid in silencing the exhaust noise
C. increase the mean effective pressure
D. contribute to effective cylinder scavenging
[单项选择]Refrigeration system compressor crankcase sweating is an indication of （）.
A. insufficient lube oil circulating through the system
B. excessive circulation of lube oil through the system
C. insufficient refrigerant in the system
D. an overworked compressor
[单项选择]Internal combustion engine crankcase vent outlets must be equipped with （）
A. hinged rain guards
B. corrosion resistant flame screens
C. dipsticks for measuring oil levels
D. crankcase ventilation fans
[单项选择]A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
A. a shortage of refrigerant in the system
B. air in the system
C. an accumulation of liquid refrigerant in the crankcase
D. a shortage of oil in the crankcase
[单项选择]If the refrigeration compressor crankcase is sweating, the cause may be due to （）.
A. a shortage of refrigerant
B. the compressor running continuously
C. liquid refrigerant returning to the compressor
D. the compressor short cycling on the high pressure cutout
[单项选择]If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.
A. system was overcharged with refrigerant
B. system was low on refrigerant
C. suction valves were leaking slightly
D. relief valve was leaking slightly
[单项选择]Crankcase explosions in propulsion diesel result from（）
A. the splashing of lubrication oil by the crankshaft
B. the dilution of crankcase oil with particles of combustion
C. broken fuel lines spraying oil on the crankcase
D. the ignition of unburned fuel and air in the crankcase
[单项选择]If a refrigeration system compressor crankcase is sweating, you should （）.
A. add refrigerant to the system
B. adjust the thermal expansion valve to the proper setting
C. adjust the float valve to the proper holding pressure
D. open the hand expansion valve
[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]What function is provided by the crankcase ventilation system on some diesel engines?（）
A. Increases the sludge forming tendency of lube oil
B. Prevents the accumulation of combustible gases
C. Improves lube oil cooling
D. Improves cold weather starting
[单项选择]A diesel engine crankcase ventilation system （）
A. prevents spark generation
B. removes combustible gases
C. determines the level of combustible gases
D. provides inert gas generation in crankcase
[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]Crankcase sweating in a refrigeration system is caused by （）.
A. a stuck solenoid valve
B. a shortage of refrigerant
C. too much oil in circulation
D. too much superheat
[单项选择]Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.
A. compressor damage from improper lubrication
B. refrigerant absorption by the lubricant
C. increased viscosity in the lubricant
D. carbon deposit on the compressor suction valves
[单项选择]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 gases
