單項(xiàng)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

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單項(xiàng)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

單項(xiàng)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

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