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单选题
With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.
A
increase the exhaust temperature
B
increase the power of
C
reduce the speed
D
increase the fuel consumption
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考题
Temperature and moisture characteristics are modified in a warm or cold air mass due to ______.A.pressure changes in the air massB.movement of the air massC.the heterogeneous nature of the air massD.upper level atmospheric changes
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A source of an air mass labeled mTw is ______.A.the equatorB.the Gulf of MexicoC.AlaskaD.Canada
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A frontal thunderstorm is caused by ______.A.pronounced local heatingB.wind being pushed up a mountainC.a warm air mass rising over a cold air massD.an increased lapse rate caused by advection of warm surface air
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A warm air mass is characterized by______．A.stabilityB.instabilityC.gusty windsD.good visibility
考题
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week according to the National Weather Service.
According to the NWS a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
Temperatures across the Midwest will drop into the 60s and 70s-a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington
The cool breezes may be a welcome relief this time around but remember the last few times we got hit with Arctic air？
Temperatures in cities including Chicago Cleveland New York and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we’re sure you remember
According to the National Weather Service____A. the cool mass of air originates from Canada
B. a mass of cold air will affect both Canada and the U.S
C. the chilly weather is back to the globe
D. only the upper Midwest will be affected by the cool air
考题
Some of the larger birds can remain stationary in the air for several minutes.A:silent
B:seated
C:true
D:motionless
考题
资料：We never thought we'd say this, but we'd welcome back some chilly weather.
A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week, according to the National Weather Service.
According to the NWS, a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week.
Temperatures across the Midwest will drop into the 60s and 70s—a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington.
The cool breezes may be a welcome relief this time around, but remember the last few times we got hit with Arctic air?
Temperatures in cities including Chicago, Cleveland, New York, and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we're sure you remember.
According to the National Weather Service, ___.A.the cool mass of air originates from Canada
B.a mass of cold air will affect both Canada and the U.S.
C.the chilly weather is back to the globe
D.only the upper Midwest will be affected by the cool air
考题
Some of the larger birds can remain stationary in the air for several minutes.A:silent
B:motionless
C:seated
D:true
考题
单选题A warm air mass is characterized by（）.A
stabilityB
instabilityC
gusty windsD
good visibility
考题
单选题When crossing a front,isobars tend to（）.A
change from smooth curves within the air mass to sharp bends at the frontB
change from sharp bends within the air mass to smooth curves at the frontC
pass smoothly across the front with no changeD
become closer together at the front and pass through in straight lines
考题
单选题Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.A
pressure changes in the air massB
movement of the air massC
the heterogeneous nature of the air massD
upper level atmospheric changes
考题
单选题Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.A
scavengingB
startingC
coolingD
blowing
考题
单选题The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an （）A
air compressorB
diffuserC
after-coolerD
ventilator
考题
单选题A frontal thunderstorm is caused by（）.A
pronounced local heatingB
wind being pushed up a mountainC
a warm air mass rising over a cold air massD
an increased lapse rate caused by advection of warm surface air
考题
单选题（）are supplied by main switchboard directly.A
Suez Canal searchlight, air compressor and air conditioning compressorB
Air compressor, boiler blower and refrigeration plantC
Boiler blower, Suez Canal searchlight and refrigeration plantD
Suez canal searchlight, air compressor and boiler blower
考题
单选题The engine will fail to start unless （）.A
the pressure of the starting air is high enoughB
there is enough air in the air reservoirsC
the air is supplied into the cylinders in the appropriate sequenceD
all of the above
考题
单选题Cooling the intake air supplied to a diesel engine will （）.A
reduce mean effective pressureB
decrease average compression pressureC
decrease air charge densityD
increase power output
考题
单选题Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.A
specific volumeB
densityC
viscosityD
calorific value
考题
单选题Compressed air is supplied by air compression to （）.A
the air receiversB
the starting valvesC
the cylinder coversD
the distributors
考题
单选题The compressed air is supplied by （） to the air reservoirs.A
compressorsB
forced fansC
ventilatorsD
generators
考题
单选题As the temperature of an air mass decreases，the（）.A
absolute humidity decreasesB
relative humidity increasesC
specific humidity decreasesD
dew point rises
考题
单选题Steam smoke will occur when（）.A
extremely cold air from shore passes over warmer waterB
warm dry air from shore passes over cooler waterC
cold ocean water evaporates into warm airD
cool rain passes through a warm air mass
考题
单选题As the temperature for a given mass of air increases，the（）.A
dew point increasesB
dew point decreasesC
relative humidity increasesD
relative humidity decreases
考题
单选题The engine is started with （） supplied from air receivers.A
pressure oilB
pressure waterC
compressed airD
cooling water
考题
单选题When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will（）A
lag behind the increased fuel supplied to the engineB
enter the engine along with the increase in the fuelC
enter the engine before the increased fuel supplyD
leave the turbocharger as a negative pulse
考题
单选题Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.A
are made ofB
are made fromC
make use ofD
are used to
考题
单选题Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.A
make use ofB
have made the use ofC
by means ofD
make advantage of
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