单项选择题
A.reduce engine exhaust noise B.reduce engine back pressure C.recover heat which otherwise would be lost D.increase turbocharger efficiency
The principal difference between loop scavenging and cr...
单项选择题The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A.direction of air flow within the cylinder B.sequence of port opening C.method of opening exhaust ports D.volume of air admitted to the cylinder
Oxygen corrosion in auxiliary boilers is prevented by t...
单项选择题Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
A.sulfite or hydrazine B.sulfite or hygroscopic sulfite C.bromide or hydrazine D.bromide or hygroscopic sulfite
Operating a diesel engine for prolonged periods, with a...
单项选择题Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.
A.the formation of sulfuric acid B.a decrease in lube oil viscosity C.a decrease in cooling water pH D.a thermostat failure
