單項(xiàng)選擇題One advantage of dry cylinder liners used in a diesel engine is the()

A.lower thermal expansion rates than wet liners
B.greater heat transfer rate than wet liners
C.greater wear resistance than wet liners
D.procedure to replace dry liners is simpler than for wet liners


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1.單項(xiàng)選擇題Intake air flow from a diesel engine turbocharger is directly proportional to engine()

A.exhaust gas pressure
B.exhaust gas temperature
C.speed
D.load

2.單項(xiàng)選擇題Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? ()

A.Viscosity is decreased
B.Octane number is altered
C.Pump speed is decreased
D.Blower’s speed is decreased

3.單項(xiàng)選擇題It is easier to replace a dry cylinder liner than a wet one because()

A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall

4.單項(xiàng)選擇題Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?()

A.Constant pressure
B.Pulse
C.constant velocity
D.Axial flow

5.單項(xiàng)選擇題Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?()

A.Fuel injection timing will change
B.Nozzle operation will be unaffected
C.Fuel will leak into the drain line
D.Fuel will not be delivered