單項選擇題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


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1.單項選擇題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

2.單項選擇題To prevent vibration damage to the fuel supply line of a diesel engine, you may use （）.

A.a short length of heavy duty clear plastic tubing
B.a length of approved flexible nonmetallic hose
C.welded flange connections for all joints
D.aluminum piping with expansion loops

3.單項選擇題When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.

A.pick up more of any increase in load
B.pick up less of any increase in load
C.share an equal amount of any increase in load
D.drop an equal amount of any decrease in load

4.單項選擇題Diesel engine jacket water is used in the distillation process as the （）.

A.coolant for the distillate
B.coolant for the brine cooler
C.means of heating the feedwater
D.primary means of producing a vacuum within the distiller

5.單項選擇題The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.

A.avoid unnecessary pints inventory
B.keep torsional vibration constant
C.use existing supports and braces
D.maintain specified injection characteristics