单项选择题

Fuel is admitted to a diesel engine cylinder through the （）.

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

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单项选择题

Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.

A.clearance
B.crush
C.pitch
D.thrust

单项选择题

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

单项选择题

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