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Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ______.
A.air charge density becoming too high
B.piston crown surfaces becoming too cold
C.formation of excessive quantities of condensate
D.compression pressure being greatly reduced
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更多 “ Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ______.A.air charge density becoming too highB.piston crown surfaces becoming too coldC.formation of excessive quantities of condensateD.compression pressure being greatly reduced ” 相关考题
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A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct
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Fuel has been injected but ignition fails. The possible cause may be ______.A.slightly leaky exhaust valveB.increased scavenging air temperatureC.engine cylinders not scavenged sufficientlyD.too much water in the fuel oil
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Sweat damage will occur in a cargo hold containing machinery parts when ______.A.the outside air is colder than the cargo．B.the air temperature of the hold is higher than the outside air temperature．C.the dew point of the hold is higher than the temperature of the cargo．D.the dew point of the outside air is lower than the temperature of the cargo
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Air temperature varies with ______.A.the altitude above sea levelB.the season of the yearC.the latitude or distance from the equatorD.All of the above
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Sweat damage in a hatch full of canned goods in cartons will occur when the ______．A.Air temperature is higher than the temperature of the cargoB.Air temperature is lower than the temperature of the cargoC.Dew point is higher than the temperature of the cargoD.Dew point is lower than the temperature of the cargo
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Which of the following can conserve energy in a server room？（）A、Sealing all potential cold air leaksB、Installing additional cooling fansC、Setting the temperature lowerD、Replacing the UPS with a generator
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Mike, a technician, is working on a computer and the air is dry. Which of the following choices is the BEST option for Mike to use?（）A、Use a portable anti-static pad and wrist strap, ensuring all components remain on the mat, and the wrist strap is connected to the mat.B、Leave the computer plugged in and running, to stabilize the power, and keep one hand on the case at all times while working on the unit.C、Use a wrist strap, connecting it to the computer case. Leave the computer plugged into the outlet for grounding.D、Advise the customer it is best if the computer is taken back to the shop for repair, so it will be in a controlled temperature environment.
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单选题Which one is true as regards to the hard hat according to the passage?（）A
It needs not to be regularly replacedB
It is designed to protect from possible impactC
It is required to be worn on deck at all times by all shipsD
fibreglass hardhat should not be used on board ships
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单选题Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）A
an increase in the exhaust temperature of the affected cylinderB
the turbocharger may surgeC
the explosion pressure in all cylinders will rise violentlyD
smoke from the turbocharger air inlet filter will be seen
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单选题To obtain maximum efficiency, two stage air compressors are usually （）.A
horizontally mountedB
never fitted with intake filtersC
fitted with intercoolersD
operated in an unloaded condition at all times
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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
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单选题Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）A
The chromium will not wear out the piston ringsB
The chromium strengthens the liners in the way of the scavenging air portsC
Chromium eliminates the need for oil scraper ringsD
Pores in the plating aid in maintaining the lube oil film
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单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-strokeA
(1) only is correctB
(2) only is correctC
both (1) and (2) are correctD
Neither (1) or (2) are correct
考题
单选题Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the （）.A
air charge density becoming too highB
piston crown surfaces becoming too coldC
formation of excessive quantities of condensateD
compression pressure being greatly reduced
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单选题Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passagesA
(1)+(2)B
(1)+(3)C
(2)+(3)D
(1)+(2)+(3)
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单选题Sweat damage will occur in a cargo hold containing machinery parts when（）.A
the outside air is colder than the cargoB
the air temperature of the hold is higher than the outside air temperatureC
the dew point of the hold is higher than the temperature of the cargoD
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injecting fuel oil into a cylinderB
removing exhaust gases from the cylinderC
forcing air into the cylinders under pressure after the exhaust valve has dosedD
a combination of all the above
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rely on famous people all the timeB
invest as much money as possibleC
face the risks of possible failureD
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removing all but the frictional load during startingB
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单选题In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the （）that can produce a good flame for the most efficient operation.A
fuel-air ratioB
compression ratioC
fuel rackD
viscosity index
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单选题Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?（）A
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单选题To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）A
admit only enough fresh outside air to provide proper ventilationB
reduce the air reheating system loadC
lower the compressor head pressureD
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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
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单选题The process of scavenging a two-stroke/cycle diesel engine serves to（）A
improve fuel flow volumeB
cool the exhaust valvesC
reduce the intake air charge densityD
increase the temperature of exhaust gases
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单选题The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）A
direction of air flow within the cylinderB
sequence of port openingC
method of opening exhaust portsD
volume of air admitted to the cylinder
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单选题Fuel has been injected but ignition fails The possible cause may be （）.A
leaky exhaust valveB
increased scavenging air temperatureC
engine cylinders not scavenged sufficientlyD
water in the fuel oil
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单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA
(1) onlyB
(2) onlyC
both (1) and (2)D
neither (1) nor (2)
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