單項(xiàng)選擇題In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the ().

A.lube oil pump suction line
B.lube oil pump discharge line
C.bottom of the lube oil sump
D.outlet from the lube oil header


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1.單項(xiàng)選擇題Theoretical perfect combustion in a diesel engine yields by-products of ().

A.aldehydes and carbon dioxide
B.water vapor and carbon monoxide
C.nitrogen and carbon monoxide
D.water vapor and carbon dioxide

2.單項(xiàng)選擇題Which of the following devices is a common basic element with nearly all mechanical governors?()

A.Power piston
B.Control rack
C.Weights acted on by centrifugal force
D.Isochronous droop spring

3.單項(xiàng)選擇題A change in the degree of fuel atomization in a diesel engine would most greatly affect ().

A.air turbulence
B.fuel penetration
C.fuel spray angle
D.fuel injection rate

5.單項(xiàng)選擇題The lower section of a piston is called the ().

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