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An auxiliary diesel engine may fail to start due to()
A . low exhaust back pressure
B . high lube oil temperature
C . insufficient cranking speed
D . excessive fuel atomizatio
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If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?()
A . Full power cannot be developed
B . The exhaust will contain black smoke
C . Complete combustion will be impossible
D . All of the above
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In an auxiliary diesel engine, the reason for knurling the piston skirt is to()
A . improve skirt lubrication
B . allow for expansion
C . transmit forces evenly
D . improve the piston seal
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If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be ()
A . a glazed surface on the spring
B . nicks in the protective coating
C . a build up of sludge deposits
D . cracks in the surface of the spring
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Fuel oil contamination of an auxiliary diesel engine lube oil can result in()
A . an increased flash point
B . higher lube oil pressures
C . an increased viscosity
D . lower lube oil pressure
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If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should()
A . check the air filter for obstruction
B . check for an exhaust leak
C . check the exhaust temperature
D . secure the engine
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A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in ()
A . ignition lag
B . engine horsepower
C . lube oil system pressure
D . specific fuel consumptio
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An auxiliary reservoir for starting auxiliary engines should be kept at ().
A . low pressure at all times
B . full pressure at all times
C . low pressure at intermittence
D . full pressure at intermittence
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Starting air for auxiliary engines may be taken directly from the main reservoirs or through ().
A . an auxiliary reservoir
B . a controlling air bottle
C . an emergency air compressor
D . a main air compressor
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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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When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should()
A . maintain higher than normal jacket water temperature
B . change the lube oil more frequently than normal
C . maintain a higher air-box temperature than normal
D . maintain a higher air-box pressure than normal
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Diesel engines are considered safer than gasoline engines because().
A . they are more heavily built
B . the fuel used is less volatile
C . they can be easily reversed
D . they operate at a lower speed
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About the jacket water, that of the auxiliary engines usually() is circulated by pumps, and the main engine usually ()
A . an engine-driven;as well
B . an engine-driven;has an independent pump
C . an independent;as well
D . an independent;has an engine-driven pum
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Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles()
A . filtering
B . centrifuging
C . depositing
D . operating
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Worn main bearing will cause the compression ratio of an auxiliary diesel engine to()
A . increase
B . decrease
C . remain the same
D . increase on compression decrease on expansio
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Excessive valve lash in an auxiliary diesel engine will cause the valves to open()
A . later and close sooner
B . sooner and close later
C . sooner and close sooner
D . later and close later
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If an auxiliary diesel engine frequently stalls, the trouble may be caused by ()
A . low exhaust back pressure
B . air in the fuel system
C . gasket blow-by or leakage
D . incorrect assembly of idler spring
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Critical speed in diesel engines occurs when engine torque pulsations become ()
A . opposed to the crankshaft rocking couple
B . resonant with the crankshaft natural frequency
C . critical fore and aft crankshaft vibrations
D . horizontal whipping motions of the crankshaft
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If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an ()
A . cavitation erosion in the water jackets
B . excess corrosion inhibitor in the coolant
C . dirty jacket water cooler
D . defective turbocharger
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Diesel oil may be used to cool () of a diesel engine.
A . cylinders
B . exhaust valves
C . pistons
D . fuel valve
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Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control ()
A . the lubricating oil consumption
B . the turbine blade temperature
C . the flow rate of fuel
D . scavenge air pressure
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The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the () cycle.
A . two-stroke
B . four-stoke
C . long-stroke
D . short-stroke
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An electrically driven automatically operating auxiliary blower is provided for slow speed and () of a low speed diesel engine.
A . manoeuvring operations
B . bad combustion
C . cooling
D . mooring trial
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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