單項選擇題Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?()

A.To allow for greater expansion due to higher operating temperature
B.To seal the cylinder against leakage of combustion gases
C.To provide an additional surface for oil cooling
D.To provide an additional strength for the crown and lower structure


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1.單項選擇題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

2.單項選擇題The upper section of a piston is called the ()

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

3.單項選擇題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

5.單項選擇題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