更多"Exhaust valve openings in a diesel "的相关试题:
[单项选择]Diesel engine valve springs function to （）
A. hold the valves open
B. keep the valves off their seats until the exhaust stroke is completed
C. close the valves
D. open inlet valves when the air injection cycle begins
[单项选择]The diesel engine valve subjected to most severe conditions of service is the （）.
A. cylinder exhaust valve
B. air starting valve
C. air inlet valve
D. cylinder relief valve
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]Diesel engine air start valve timing is controlled by（）
A. engine operating speed
B. an air manifold
C. a hydraulic distributor
D. individual cams and valve gear
[单项选择]A smoking exhaust from an operating diesel engine could be caused by （）
A. low sulfur content in the fuel
B. a loose injector inlet connection
C. late fuel injection
D. high injection pressure
[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]A dark exhaust from a running diesel engine can be caused by （）
A. late ignition
B. water in the fuel
C. high compression temperature
D. starting valve stuck open
[单项选择]Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to （）
A. provide added wear protection against today’s corrosive quality of fuel
B. increase overall valve strength due to the high gas pressures
C. assist in dissipating heat due to the extreme operating temperatures
D. reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering
[单项选择]Diesel engine exhaust temperatures may be used to indicate （）.
A. leaking exhaust valves
B. an overloaded cylinder
C. a clogged injector nozzle
D. all of the above
[单项选择]Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.
A. performance
B. horsepower output
C. fuel consumption
D. scavenge effect
[单项选择]The color of the exhaust from a diesel engine should be （）
A. clear
B. hazy light brown
C. hazy light blue
D. hazy light grey
[单项选择]
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) nor (2)
[单项选择]Diesel engine exhaust noise can be reduced in an exhaust muffler by （）
A. changing the direction of exhaust gas flow
B. increasing the exhaust gas velocity
C. changing the exhaust gas weight
D. increasing the exhaust gas static pressure
[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]The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
A. prevent engine back pressure at heavy loads
B. increase total engine efficiency at low loads
C. prevent boiler corrosion at low engine loads
D. improve engine fuel consumption at any load
[单项选择]Pyrometers commonly found on diesel engine exhaust systems, consist of（）
A. pyrostats and a voltmeter
B. a gas-filled bellows, a tube and a pressure gauge
C. thermocouples and a voltmeter
D. ammeters and thermocouples
[单项选择]Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）
A. later and close sooner
B. sooner and close later
C. sooner and close sooner
D. later and close later
[单项选择]A diesel engine emits blue exhaust smoke as a result of（）
A. cold intake air
B. excessive compression pressure
C. excessive cylinder lubrication
D. a light load
