單項(xiàng)選擇題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


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1.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

2.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

3.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

4.單項(xiàng)選擇題Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.

A.fuel oil vapor at the sludge tank vent
B.unburned fuel vapors in the scavenge air receiver
C.lube oil vapors in the crank case
D.lube oil vapors in the engine room

5.單項(xiàng)選擇題Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.

A.during the valve overlap period
B.with only the exhaust valve open
C.at a pressure below atmospheric
D.without cooling the cylinders or pistons