單項選擇題A feed pump for an auxiliary boiler might lose suction if the ().

A.boiler water level is low
B.feedwater is too hot
C.boiler steam demand is low
D.feedwater is too cold


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1.單項選擇題Fuel is admitted to a diesel engine cylinder through the ().

A.intake valves
B.carburetor
C.exhaust ports
D.injector nozzles

3.單項選擇題If an operating auxiliary boiler has a water pH reading of 7, you should ().

A.bottom blow the boiler
B.treat the water with caustic soda
C.treat the water with chemical scavengers
D.reduce the water alkalinity to recommended readings

4.單項選擇題Generating tubes in waste heat boilers are finned to ().

A.reduce gas flow turbulence
B.prevent exhaust gas corrosion
C.increase the rate of combustion
D.increase the rate of heat transfer

5.單項選擇題Directional intake ports in diesel engines are used to ().

A.reduce air charge turbulence
B.induce air swirl
C.deflect hot combustion gas away from the valves
D.oppose the effects of piston induced squish