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单选题
The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.
A
8-10℃
B
10-12℃
C
10-15℃
D
10-20℃
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更多 “单选题The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.A 8-10℃B 10-12℃C 10-15℃D 10-20℃” 相关考题
考题
第二组The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressive increase in the temperature difference between the two fluids, over a period of time, usually accompanied by a noticeable rise in pressure loss at a given flow.Fouling on the sea-water side is the most usual cause of deterioration in performance. The method of cleaning the sea water-side surfaces depends on the type of heat exchanger. With shell-and-tube heat exchangers, the removal of the header covers or, m the case of the smaller heat exchangers, the headers themselves, will provide access to the tubes. Obstructions, dirt, scale etc., can then be removed, using the tools provided by the heat exchanger manufacturer. Flushing through with fresh water is recommended before a heat exchanger is returned to service. In some applications, such as piston oil cooling, progressive fouling may take place on the outside of the tubes. Most manufactures recommend a chemical flushing pr6cess to remove this in situ~ without dismantling the heat exchanger.Plate heat exchangers may be cleaned by unclamping the stack of plates and mechanically cleaning the surface of each plate as recommended by the manufacturers. The plate seals may require replacement from time to time and here the manufacturers instructions should be closely followedBy which of the following indication, can we conclude that the lube oil-sea water heat exchanger is unduly fouled?A.the heat exchanger lube oil inlet temperature loweringB.the heat exchanger sea-water outlet pressure riseC.the heat exchanger temperature difference between lube oil and sea water increasingD.the heat exchanger pressure difference between sea water inlet and outlet decreasing
考题
_______can cause oil flow from water outlet of the oil purifier.A.Oil inlet valve opening too quicklyB.Oil temperature little higher than normalC.Diameter of gravity disc too smallD.Viscosity of oil little lower than normal
考题
The height of tide is the ______.A.depth of water at a specific time due to tidal effectB.difference between the depth of the water and the area's tidal datumC.difference between the depth of the water and the high water tidal levelD.difference between the depth of the water at high tide and the depth of the water at low tide
考题
What does the command show | compare rollback 1 display?（）A、the difference between the current candidate configuration and the candidate configuration from one commit agoB、the difference between the current active configuration and the current candidate configurationC、the difference between the current active configuration and the active configuration from one commit agoD、the difference between the current candidate configuration and the archived configuration from one commit ago
考题
单选题As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.A
increaseB
decreaseC
remain unchangedD
be greatest at dew point
考题
单选题The purpose of an after-cooler is to（）A
reduce the turbocharger operating temperatureB
increase the pressure of the inlet airC
increase the density of the inter airD
reduce the blower operating temperature
考题
单选题In a turbocharger, inlet air velocity is increased in the（）.A
inlet nozzle ringB
stationary diffuser passagesC
compressor outlet voluteD
rotating impeller vanes
考题
单选题As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.A
the inlet valveB
the outlet valveC
both the inlet valve and the outlet valveD
the pump inlet valve
考题
单选题The dew point temperature is（）.A
always higher than the air temperatureB
always lower than the air temperatureC
equal to the difference between the wet and dry bulb temperaturesD
the temperature at which the air is saturated with water vapor
考题
单选题A re-heater in an air conditioning system functions to （）.A
control inlet air temperatureB
control inlet air volumeC
maintain relative humidity at 15%D
restore conditioned air temperature to a comfortable level
考题
单选题What does the command show | compare rollback 1 display?（）A
the difference between the current candidate configuration and the candidate configuration from one commit agoB
the difference between the current active configuration and the current candidate configurationC
the difference between the current active configuration and the active configuration from one commit agoD
the difference between the current candidate configuration and the archived configuration from one commit ago
考题
单选题An increased differential between the inlet and outlet of a strainer usually indicates the strainer is （）A
holedB
fouledC
cleanD
dry
考题
单选题In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed（）A
at the jacket cooler outlet to control the flux through the engineB
at the jacket cooler outlet to control the flux through the coolerC
at the engine outlet to control the flux through the engineD
at the engine inlet to control the flux through the engine
考题
单选题（）can cause oil flow from water outlet of a separator.A
Oil inlet valve opening too quicklyB
Oil temperature too highC
Diameter of gravity disc too smallD
Viscosity of oil too low
考题
单选题The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）A
CrossB
ParallelC
CounterD
Circular
考题
单选题Which of the following statements is correct concerning heat transfer?（）A
Heat is given off from a high temperature region known as a heat sinkB
Heat transfer rate is affected most by the size of the heat sink involvedC
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sinkD
Heat transfer by radiation will occur only by mass motion of a fluid substance
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An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is （）A
holedB
fouledC
cleanD
dry
考题
单选题（）can not cause oil flow from water outlet of self-cleaning separator.A
Oil temperature too highB
Diameter of gravity disc too largeC
Oil temperature too lowD
High level tank out of water
考题
单选题After received the “finished with engine” instruction, which of the following operations is false?（）A
shut off the starting air receiver outlet valveB
stop the FO priming transfer pump and shut off the correspondence inlet and outlet valveC
stop the SW pump immediately and shut off the correspondence inlet and outlet valveD
stop the FW pump immediately and shut off the correspondence inlet and outlet valve
考题
单选题After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.A
15；inlet valueB
15；inlet and outlet valueC
30；inlet valueD
30；inlet and outlet value
考题
单选题The greater the pressure difference between a high and a low pressure center，the（）.A
dryer the air mass will beB
cooler the temperature will beC
greater the force of the wind will beD
warmer the temperature will be
考题
单选题Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?（）A
An increased air temperature differential between the cooler inlet and outletB
A decrease in the air pressure differential across the coolerC
Excessive condensate forming in the air boxD
A decrease in the air temperature differential between the cooler inlet and outlet
考题
单选题On what do you depend having the air cooler of main engine chemically washed?（）A
increased air pressure differenced before and aft air coolerB
reduced exhaust temperature in all cylindersC
reduced temperature difference between water inlet and outletD
both A and C
考题
单选题In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.A
by an fuel valveB
through an inlet valveC
with an exhaust valveD
from an outlet valve
考题
单选题In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.A
the outlet of oilB
the outlet of waterC
the bowl peripheryD
the center of bowl
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