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A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.
A、the low inertia
B、the high inertia
C、the low velocity
D、the high velocity
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During repair,lubrication lines and orifices must be （）.
A . taken away
B . engaged
C . connected
D . sealed off
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Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.
A、main bearings
B、connecting rod bearings
C、piston pin bushings
D、all of the above
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Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
A . their free-floating design
B . their relatively small size
C . the reciprocating motion of the piston
D . their position in the lubrication system
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You are preparing to lubricate standing rigging on your vessel．When rigging a bosun’s chair on a stay with a shackle，（）.
A . Connect the shackle to the bosun's chair with a hook
B . Never allow the shackle pin to ride on the stay
C . Run the gantline through the shackle and then make fast to the bosun's chair
D . Tie the bitter end of the gantline to the shackle before shackling it to the bosun's chair
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Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.
A . wax precipitation in the lube oil
B . contamination by dust, scale, or moisture
C . refrigerant bubbles in the lube oil
D . refrigerant reducing the lube oil viscosity
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On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.
A . splash method
B . mechanical force feed lubricators
C . detached sump method
D . internal cooling passages in the crankshafts and connecting rod
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The vapors given off by heated fuel oil are heavier than air and are（）.
A . odorless
B . explosive
C . nontoxic
D . visible
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Starting air valves are held firmly on their seats by（）
A . cam rollers on the camshaft
B . spring force
C . air pressure on top of the valve differential piston
D . air pressure on the bottom of the valve differential pisto
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Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
A . camshaft beatings
B . main bearings
C . piston crowns
D . cylinder wall
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The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.
A . because
B . though
C . since
D . until
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Two main lubricating oil pumps are usual and are obligatory in （）.
A . container ships
B . bulk carriers
C . passenger ships
D . barge
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When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.
A . stand-by engine
B . full ahead
C . finished with engine
D . full away
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To obtain maximum efficiency, two stage air compressors are usually （）.
A . horizontally mounted
B . never fitted with intake filters
C . fitted with intercoolers
D . operated in an unloaded condition at all time
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Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A . lower compression pressures
B . overheating without smoking
C . failure to start
D . a run away without load
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A （） in the air delivery line near to each compressor is essential.
A . butterfly valve
B . globe valve
C . gate valve
D . non-return valve
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Air reservoirs are designed, built and tested similarly to （）.
A . boiler drums
B . hot wells
C . condensers
D . evaporator
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Diesel engine air start system check valves are opened by （）
A . an air start cam
B . cylinder compression pressure
C . starting air pressure
D . valve spring
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Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
A . Splash
B . Gravity
C . Pressure
D . Bypa
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The following options are all the functions of lubricating oil except（）
A . removing heat and deposits
B . neutralizing acidic products
C . lubricating
D . improving combustion efficiency
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Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A . operated manually once an hour
B . operated until the engine has started
C . placed into operation only at maximum load
D . adjustable to meet lubrication requirement
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Air receivers installed in starting air systems are to be （）.
A . cylindrical in shape with service connections located at the top and bottom
B . opened and made available for inspection during biannual inspections provided
C . with automatic drain traps for the removal of moisture
D . so installed as to make the drain connections effective under extreme conditions of trim
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The lubricating oil is pumped from the drain tank, very often with （） in the suction line.
A . a filter
B . a strainer
C . a magnetic filter
D . a fine strainer
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Isogonic lines are lines on a chart indicating （）.
A . points of equal variation
B . points of zero variation
C . the magnetic latitude
D . magnetic di
