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单项选择题
A.Exhaust energy would draw excess air
B.The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increase
C.Exhaust gas pumping losses are increased due to turbine windage
D.Exhaust gas back pressure falls slightly due to increased nozzle action
单项选择题
A.use of low viscosity oil in cold weather
B.increased moisture content of inlet air in cold weather
C.increased drag of pistons and bearings due to increased oil viscosity
D.higher compression pressures reached due to smaller clearances existing in the engine during cold weather
单项选择题
A.octane number
B.cetane number
C.viscosity in Saybolt seconds
D.air fuel ratio
单项选择题
A.Decreasing scavenge air pressure
B.Increasing exhaust temperatures before the turbine
C.Reduction in engine speed
D.All of the above
单项选择题
A.quality of air filtration
B.effectiveness of lubrication
C.type of fuel used
D.all of the above
单项选择题
A.cetane number
B.octane number
C.ignition index number
D.volatility point
单项选择题
A.antiknock characteristics
B.ignition qualities
C.rates of vaporization
D.viscosity
单项选择题
A.increase in starting air pressure
B.increase in lube oil viscosity
C.compression expansion device
D.jacket water heater
单项选择题
A.corrosion and grooving of exhaust valves
B.corrosion and gumming of the fuel injection pump
C.salt deposits in the exhaust manifold
D.slag deposits in the fuel injection equipment
单项选择题
A.clogged fuel injection pumps
B.increased cylinder liner wear
C.intake valve stem corrosion
D.varnish deposit on pistons