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单选题
The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
A
reduce water temperature
B
reduce water turbulence
C
provide an air cushion
D
allow for an increase in water volume as the engine warms up
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What is head tank in the closed cooling water system used for?A.for the release of air from the cooling waterB.providing expansion room for heated cooling waterC.a place for implementing water and water treatment agentD.all of the above
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An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that .A.the expansion tank is lack of waterB.the expansion tank is over flowingC.there is something wrong with the cooling systemD.there is something wrong with the engine
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In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.A.suction pressure regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank
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Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.A.increase power outputB.decrease lube oil viscosityC.eliminate fuel knockD.cause sulfuric acid formation
考题
单选题Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）A
Maintains a constant head on the systemB
Reduces the likelihood of air or steam pockets formationC
Provides a low pressure point for the addition of makeup cooling waterD
All of the above
考题
单选题If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）A
a broken shaft on the freshwater pumpB
an excessive accumulation of scale exchangerC
an incorrect thermostatic element operating rangeD
lube oil in the cooling water
考题
单选题The pH value of water in a diesel engine closed cooling water system should be maintained between （）.A
60 to75B
80 to 95C
100 to 115D
120 to 135
考题
单选题What is head tank in the closed cooling water system used for?（）A
for the release of air from the cooling waterB
providing expansion room for heated cooling waterC
a place for implementing water and water treatment agentD
all of the above
考题
单选题The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.A
fresh water expansion tankB
sea water expansion tankC
thermostatic expansion valveD
jacket water cooler accumulator
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单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）A
a low level in the engine expansion tankB
excessively high coolant pressureC
improper temperaturesD
malfunctioning of the jacket water heater
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 diesel engine that has an engine driven lube oil pump, the engineer should （）.A
open the bypass lineB
cut in the lube oil coolerC
pressurize the lube oil systemD
top off the expansion tank
考题
单选题Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）A
Exhaust temperatureB
Lube oil levelC
Lube oil pressureD
Water level in the expansion tank
考题
单选题High diesel engine cooling water temperatures can be caused by （）.A
air in the cooling systemB
an overhauled water pumpC
correct amount of coolantD
no air in the cooling system
考题
单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
improper venting of the cooling systemB
carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
an incorrectly set cooling system temperature control
考题
单选题The expansion tank in a diesel engine closed freshwater cooling system is located at （）A
the highest point in the systemB
the lowest point in the systemC
near the floorD
plate level or near the tank top level
考题
单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.A
cylinder head water outlet headerB
cylinder jacket inlet mainC
heat exchanger inlet connectionD
jacket water pump suction line
考题
单选题The highest pressure in any closed diesel engine freshwater cooling system is at the （）.A
jacket water outletB
expansion tank inletC
heat exchanger inletD
cooling water pump outlet
考题
单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）A
raw water pump dischargeB
expansion tank outletC
cooling water heat exchangerD
outlet engine jacket water outlet
考题
单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.A
loss of suction in the circulating pumpB
leak in the primary cooling systemC
broken raw water pump shaftD
burned or cracked piston in one cylinder
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
考题
单选题In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.A
suction pressure regulatorB
thermostatic bypass valveC
sea water temperatureD
water level in the expansion tank
考题
单选题Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.A
the formation of sulfuric acidB
a decrease in lube oil viscosityC
a decrease in cooling water pHD
a thermostat failure
考题
单选题In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.A
jacket water outletB
cooling water pump outletC
heat exchanger outletD
expansion tank atmospheric vent
考题
单选题There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.A
a setting tankB
a service tankC
a head tankD
an expansion joint
考题
单选题In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?（）A
cooling water of the cooling systemB
fuel of the FO systemC
LO of the LO systemD
cooling water of the cooling system and LO of the LO system
考题
单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）A
regulating the level of corrosion inhibitor in the primary cooling systemB
the level of the freshwater expansion tankC
varying the engine load to meet temperature requirementsD
the operation of the thermostatic valve
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