單項(xiàng)選擇題The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the ()

A.fuel delivery pressure
B.pump plunger diameter
C.plunger control rack position
D.total pump stroke


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1.單項(xiàng)選擇題The upper section of a piston is called the ()

A.land
B.skirt
C.crown
D.plate

2.單項(xiàng)選擇題Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with ()

A.excessive speed
B.improper warm-up
C.extreme misalignment
D.inadequate lubrication

3.單項(xiàng)選擇題Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?()

A.Sludge
B.Gasoline
C.Fuel oil
D.Lube oil

4.單項(xiàng)選擇題The amount of fuel delivered by a unit injector is controlled by the ()

A.camshaft
B.main spring
C.rack position
D.nozzle orifice size

5.單項(xiàng)選擇題Cast iron pistons used in large propulsion diesel engines are constructed with ()

A.not taper what so ever
B.the skirt being tapered and smaller than the crown
C.the skirt being tapered and larger than the crown
D.the crown being tapered and smaller than the skirt

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