单项选择题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an ()

A.dial indicator
B.outside caliper
C.bridge gauge
D.tram rod


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2.单项选择题The ignition quality of a diesel fuel is indicated by the ()

A.cetane number
B.volatility point
C.viscosity index
D.octane number

3.单项选择题The ignition quality of a diesel fuel oil is indicated by the ()

A.specific gravity
B.cetane number
C.viscosity
D.calorific valve

4.单项选择题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?()

A.Leaking seal ring
B.Insufficient heat transfer from the exhaust valves
C.Block cooling water passages to the head
D.Excessive scavenging air provided to the engine

5.单项选择题The cetane rating of diesel fuel is an indication of the()

A.ignition quality of the fuel
B.calorific value of the fuel
C.flash point of the fuel
D.rate of fuel consumption

6.单项选择题The cetane number of a diesel fuel oil indicates its()

A.Viscosity
B.acid content
C.heating value
D.ignition quality

7.单项选择题Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?()

A.Viscosity
B.Sulfur content
C.Pour point
D.Cetane number

8.单项选择题Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?()

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

9.单项选择题Cold weather starting of a diesel engine is more difficult than warm weather starting due to()

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

10.单项选择题The ignition quality of diesel fuel is indicated by its()

A.octane number
B.cetane number
C.viscosity in Saybolt seconds
D.air fuel ratio

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