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单选题
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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更多 “单选题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 springB nicks in the protective coatingC a build up of sludge depositsD cracks in the surface of the spring” 相关考题
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add refrigerant to the systemB
adjust the thermal expansion valve to the proper settingC
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单选题After you enter Thimble Shoal Channel，you will alter course to pass between Trestle “A” and “B”. Which channel should you use?（）A
Thimble Shoal Main Channel or the South Auxiliary ChannelB
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单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）A
the engine is overloadedB
the engine is coldC
there is too much lube oil in the cylindersD
the turbocharger is fouled
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单选题The（） is fitted in pair one is the main valve, the other the auxiliary or standby.A
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auxiliary steam stop valveC
feed check or control valveD
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the inlet valveB
the outlet valveC
both the inlet valve and the outlet valveD
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motor overload would openB
relief valve would openC
pump would eventually overheatD
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单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.A
system was overcharged with refrigerantB
high pressure switch was improperly adjustedC
expansion valve strainers were fouledD
suction valves were leaking slightly
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单选题If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.A
system was overcharged with refrigerantB
system was low on refrigerantC
suction valves were leaking slightlyD
relief valve was leaking slightly
考题
单选题At 0845，you are approaching the entrances to Thimble Shoal Channel. What channel must you use?（）A
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The South Auxiliary Channel or Thimble Shoal Channel，but you must remain on the right hand side of the main channelC
The North Auxiliary Channel since you are going to turn to a northerly heading near buoy 12D
You are not permitted to use any of the channels，but must remain outside the buoyed channel line
考题
单选题The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）A
remove any air that may accumulate in the systemB
take out unpleasant fumes from the refrigerantC
vent off excess refrigerant in an emergencyD
permit opening the refrigerating system for cleaning and inspecting
考题
单选题Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）A
later and close soonerB
sooner and close laterC
sooner and close soonerD
later and close later
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auxiliary steam stop valveC
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open inlet valves when the air injection cycle begins
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单选题If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）A
low exhaust back pressureB
air in the fuel systemC
gasket blow-by or leakageD
incorrect assembly of idler springs
考题
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.A
discharge service valve as a vaporB
suction service valve as a liquidC
charging valve as a liquidD
condenser purge valve as a vapor
考题
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motor controller overload would openB
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worn valve seatsB
worn main bearingC
excessive valve clearanceD
weak rocker arm springs
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air bubbles in the sight glassB
any leaks in the systemC
over-travel in the rudder angle indicatorD
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单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A
one valve seats upwards, while the other seats downwardsB
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the suction valve springs exert a greater tension than the discharge valve springsD
the discharge valve springs exert a greater tension than the suction valve springs
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