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单选题
The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.
A
in which
B
on which
C
to which
D
by which
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Cylinders of marine diesel engines are normally cooled by ___ .A.sea waterB.fine mineral oilC.sanitary waterD.fresh water
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After being launched from a vessel, totally enclosed survival craft which have been afloat over a long period require ______.A.frequent opening of hatches to permit entry of fresh airB.regular checks of bilge levelsC.use of ear plugs to dampen engine noiseD.frequent flushing of the water spray system with fresh water
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单选题When a ship is entering to shallow water, ship resistance will be increased and the speed of main engine reduced.Due to the function of the governor, the main engine will（）A
reduce fuel feedingB
increase fuel feedingC
keep original fuel feedingD
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单选题In the navigation, cause the shafting over load most easily（）A
stopping the main engine suddenlyB
changing the main engine running direction suddenlyC
the sailing from the shallow water area to the deep water areaD
the ship’s trim too much
考题
单选题After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.A
frequent opening of hatches to permit entry of fresh airB
regular checks of bilge levelsC
use of ear plugs to dampen engine noiseD
frequent flushing of the water spray system with fresh water
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单选题If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）A
air binding of the engine cooling systemB
a cracked water cooled exhaust manifoldC
blockage in the heat exchangerD
faulty operation of the thermostat
考题
单选题Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）A
discharge side of the centrifugal pumpB
suction side of the centrifugal pumpC
the lowest point of the cooling water systemD
inlet of the main engine
考题
单选题Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.A
the gasoline tank is fullB
the bilges，cabins，etc. are thoroughly ventilatedC
you have fresh water on boardD
Each of the above is followed
考题
单选题The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.A
in whichB
on whichC
to whichD
by which
考题
单选题Trunk type diesel engine pistons are effectively cooled when heat is（）A
radiated through the engine blockB
transferred to water cooled cylinder wallsC
conducted through the piston crownD
transferred to escaping exhaust gases
考题
单选题Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）A
maintain low pH in the cooling waterB
reduce the cooling water temperatureC
increase cooling water hardnessD
form a protective film on metal surfaces
考题
单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
sea water temperature must never be warmer than 40℃B
jacket water pressure should always be greater than the sea water pressureC
jacket water temperature must always be less than 60℃D
jacket water pressure must always be less than the sea water pressure
考题
单选题In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.A
an diesel oil heaterB
a waste heat boilerC
a fresh water generatorD
all the above
考题
单选题Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）A
Defective temperature controls in the systemB
Cavitation in the cooling water pumpC
Opened vent in the cooling systemD
Restricted water passages in the engine
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单选题Exhaust pyrometer readings provide an indication of the （）A
effectiveness of water-cooled exhaust elbowsB
distribution of the load between engine cylindersC
amount of fuel penetration into the engine cylindersD
indicated horsepower of the engine cylinders
考题
单选题（） is (are) not power supplied by main switchboard directly.A
Steering gear and windlassB
Navigation light and radio power panelC
Navigation device power boxD
Daily fresh water pump
考题
单选题Lube oil in the fresh water cooling system of a diesel engine may result from a （）A
camshaft seizureB
lube oil pump failureC
lube oil cooler failureD
lube oil pump overflow
考题
单选题Trunk-type diesel engine pistons are most effectively cooled by heat（）A
conducted through the engine blockB
conducted to water cooled cylinder wallsC
conducted through the piston crownD
loss to escaping exhaust gases
考题
单选题When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be（）A
disengaging the clutch firstly, then stopping the main engineB
stopping the main engine firstly, then disengaging the clutchC
stopping the cooling water pump firstly, then stopping the main engineD
stopping the main engine and disengaging the clutch at the same time
考题
单选题In motorships，there are two main circuits, （）.A
one salt water, one fresh waterB
one salt water, one fuelC
one fresh water, one fuelD
one steam, one fuel
考题
单选题About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）A
an engine-driven；as wellB
an engine-driven；has an independent pumpC
an independent；as wellD
an independent；has an engine-driven pump
考题
单选题Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A
cylinder coversB
lubricating spaceC
crossheadD
exhaust manifold
考题
单选题Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）A
Air will enter the cooling systemB
Carbon will plug the water cooled exhaust manifoldsC
The jacket water temperature will riseD
The lube oil viscosity will increase
考题
单选题Allowance for fresh water refers to（）.A
the provision to be provided when the vessel sails in fresh water areaB
the fresh water to be carried by a vesselC
the allowance of fresh water for each crew member when in distress at seaD
the amount of free board decreased when sailing in fresh water area
考题
单选题Prior to getting underway in fresh or brackish water，the Master must（）.A
log the density of the waterB
secure all overboard dischargesC
take on fresh water ballastD
clean the sides with fresh water
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