單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）

A.increased fuel consumption
B.increased feed water consumption
C.fuel pump failure
D.combustion control system failure

4.單項(xiàng)選擇題Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）

A.Injection pressures
B.Control air supply pressure
C.Cooling water flow through after-coolers
D.Lube oil temperature

5.單項(xiàng)選擇題The procedures recommended for auxiliary boilers having high salinity include （）.

A.treating with oxygen scavengers
B.securing the boiler and giving it a blowing down
C.increasing the pH
D.reducing the phosphate level