In a diesel engine, an extremely leaking exhaust valve can cause （）.

单项选择题Diesel engine exhaust temperatures may be used to indicate （）.

A.leaking exhaust valves
B.an overloaded cylinder
C.a clogged injector nozzle
D.all of the above

单项选择题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

单项选择题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

单项选择题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

单项选择题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