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The color of the exhaust from a diesel engine should be （）
A . clear
B . hazy light brown
C . hazy light blue
D . hazy light grey
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Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）
A . In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater
B . Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports
C . No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine
D . The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
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Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A . low oil pressure
B . high coolant pressure
C . leaking fuel injector
D . cracked cylinder head or liner
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A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）
A . has little or no internal friction
B . has a lower effective compression ratio
C . operates with scavenge air under a positive pressure
D . operates without energy absorbing intake and exhaust stroke
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Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A . open the bypass line
B . cut in the lube oil cooler
C . pressurize the lube oil system
D . top off the expansion tank
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The crankshaft of diesel engine is supported by （）.
A . tension stretch
B . tie rods
C . through bolts
D . main bearing
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The purpose of the flywheel of a diesel engine is to （）.
A . counterbalance the crank throws on the crankshaft
B . keep the engine running smoothly between power stroke
C . provide a belt-driving surface for the operation of auxiliary machinery
D . prevent the engine from overspeeding
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An over-speed trip stops a diesel engine when the engine （）
A . runs out of fuel
B . has low lubricating oil pressure
C . exceeds a set maximum speed
D . has high cooling water temperature
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In a diesel engine, when the fuel is injected into the cylinder,（）
A . the piston is just coming upward from the bottom dead center
B . the piston has moved about one-fifth of the way up
C . the piston has moved most of the way up and almost reached the TDC
D . the piston has just past the TDC
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The bore of a diesel engine cylinder describes the （）
A . swept volume of the cylinder
B . inside diameter of the cylinder
C . piston displacement in the cylinder
D . length of the piston stroke
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When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）
A . starting air pressure
B . scavenge air pressure
C . over-speed trip
D . banjo oiler line
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Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A . respectable
B . respectful
C . respective
D . respectively
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What is the best indication of the loading of a diesel engine?（）
A . Oil temperature
B . Manifold pressure
C . Exhaust gas temperature
D . Fuel consumptio
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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
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Immediately after any diesel engine is started, the engineer should check the （）
A . crankcase pressure
B . lube oil pressure
C . saltwater pressure
D . exhaust temperature
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The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）
A . governor flyweight action on a pilot valve which controls fuel injection
B . governor flyweight motion acting on fuel controls through suitable linkage
C . positioning a butterfly valve in the fuel delivery system positioning
D . a servomotor piston attached to the fuel control
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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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Fuel oil discharged to the diesel engine cylinder is atomized at the （）
A . turbocharger
B . injection nozzle tip
C . carburetor
D . fuel oil pum
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The diesel engine is a type of （）.
A、A. turbine engine
B、B. gas turbine
C、C. steam engine
D、D. internal combustion engine
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A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A . as much fuel as
B . less fuel than
C . less fuel as
D . more fuel tha
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A restricted air intake to a diesel engine may result in the engine （）.
A . failing to reach rated speed
B . knocking under maximum load
C . hunting or surging under light load
D . overspeeding and running away
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On most diesel engines, the governor controls the output speed by （）.
A . controlling the amount of fuel injected into the cylinders
B . varying the speed of the turbocharger
C . adjusting the compression ratio
D . changing the timing of the fuel injection camshaft
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Diesel engine mufflers or silencers reduce the engine exhaust noise by （）
A . passing the exhaust through long head pipes
B . diffusing exhaust vibrations through activated carbon baffles
C . increasing the exhaust gas velocity
D . reducing the exhaust gas velocity
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The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A . method of supplying air
B . cooling system
C . method of igniting fuel
D . valve operating mechanism
