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单选题
The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）
A
greater than the average exhaust manifold pressure
B
less than the average exhaust manifold pressure
C
greater at the turbine wheel than at the impeller
D
greater at reduced engine speed
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If the exhaust gas temperature of the incinerator is too high, or if sparks are developed, What should you do?
A.Close the inlet and outletvalves for diesel oilB.Open the air nozzles in the secondary combustion chamber until it stopsC.Open the air nozzles in the primary combustion chamber until it stopsD.Close inlet valve for pressurized air
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The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the_______.A.inlet nozzle ringB.turbine wheel bladeC.diffuser passagesD.inlet volute
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Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .A.Reduce engine speed to idle before removing the filterB.Soak the dirty filter in kerosene onlyC.Blow out the air inlet with compressed airD.Cover the air inlet after removing the filter
考题
The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually______.A.greater than the average exhaust manifold pressureB.less than the average exhaust manifold pressureC.greater at the turbine wheel than at the impellerD.greater at reduced engine speed
考题
The expression THE AIR IS SATURATED means ______.A.the relative humidity is 100%B.the vapor pressure is at its minimum for the prevailing temperatureC.precipitation has commencedD.cloud cover is 100%
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The dew point is reached when the ______.A.temperature of the air equals the temperature of the seawaterB.atmospheric pressure is 14.7 lbs. per square inchC.relative humidity reaches 50%D.air becomes saturated with water vapor
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单选题Which of the following statements describes the function of an air compressor intake filter?（）A
Protects against suction valve floatB
Provides a positive pressure on the air inlet valvesC
Prevents lubricating oil contamination of the compressed air supplyD
Protects against the damaging effects of airborne solid particles
考题
单选题The expression THE AIR IS SATURATED means（）.A
the relative humidity is 100%B
the vapor pressure is at its minimum for the prevailing temperatureC
precipitation has commencedD
cloud cover is 100%
考题
单选题Air blowing from the intake air filter of an operating air compressor indicates （）.A
broken inlet valvesB
broken discharge valvesC
pulsations in the air distribution systemD
overloading of the air distribution system
考题
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
考题
单选题One characteristic of a pulse type turbo-charging system is（）A
high average exhaust manifoldB
greatly fluctuating inlet manifold pressureC
constant exhaust manifold pressureD
multiple exhaust pipes to the turbocharger
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Compared to a low pressure system，generally the air in a high is（）.A
warmer，less dense，and less stableB
cool，more dense，and drierC
muggy and cloudyD
extremely moist with high relative humidity
考题
单选题When air is at its dew point it is at its（）A
lowest absolute humidityB
lowest relative humidityC
highest absolute humidityD
highest relative humidity
考题
单选题A turbocharged diesel engine will have an intake manifold pressure（）A
constantly decreasing as engine load increaseB
constantly increasing as the amount of supercharging increasesC
approximately equal to exhaust manifold pressure at all timesD
approximately equal to atmospheric pressure at all times
考题
单选题Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）A
Excessive compression in the cylinderB
A broken intake valveC
A dirty inlet filter elementD
An improperly adjusted discharge valve
考题
单选题In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.A
downwards；upwardsB
upwards；downwardsC
downwards；downwardsD
upwards；upwards
考题
单选题A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）A
slightly less than atmospheric pressureB
approximately equal to exhaust manifold pressure at all timesC
that is widely fluctuating constantlyD
decreasing as engine load increases
考题
单选题When comparing the air with 50% of relative humidity with the air with 100% of relative humidity, which one will hold more water?（）A
the formerB
the latterC
not for sureD
same each other
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Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）A
Reduce engine speed to idle before removing the filterB
Soak the dirty filter in kerosene onlyC
Blow out the air inlet with compressed airD
Cover the air inlet after removing the filter
考题
单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）A
Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
Clogged air intake filters
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 a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.A
scavenging air ports；exhaust portsB
inlet ports；scavenging air portsC
scavenging air ports；inlet portsD
exhaust ports；inlet ports
考题
单选题Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）A
At zero load the intake manifold pressure is greater than the exhaust manifold pressureB
At full load the intake manifold pressure and exhaust manifold pressure are equalC
At full load the intake manifold pressure is less than the exhaust manifold pressureD
At full load the intake manifold pressure is greater than the exhaust manifold pressure
考题
单选题An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.A
decrease in maximum cylinder pressureB
increase in ignition lagC
decrease in fuel consumption per horsepower-hourD
decrease in exhaust manifold pressure
考题
单选题The timing of diesel engine air starting valves is controlled by（）A
the air start valve timing gears and rodsB
a cylinder check valveC
individual cams and valve gearD
an air manifold poppet valve
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