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

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


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1.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

2.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

3.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

4.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

5.單項(xiàng)選擇題The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by ()

A.dirt
B.fuel oil
C.governor cooling water
D.fuel oil tars