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 volume
B . density
C . viscosity
D . calorific value
相似题目
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Cooling the intake air supplied to a diesel engine will （）.
A . reduce mean effective pressure
B . decrease average compression pressure
C . decrease air charge density
D . increase power output
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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 passages
A . (1)+(2)
B . (1)+(3)
C . (2)+(3)
D . (1)+(2)+(3)
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When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will（）
A . increase in temperature
B . lose its energy partly
C . expand and do work
D . begin to be compressed
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Higher than normal temperature air passing through the intake of a diesel engine will result in（）
A . greater overall efficiency
B . greater fuel economy
C . lower horsepower
D . lower compression ratio
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The air spaces in the floor of an inflatable liferaft will provide protection against（）.
A . asphyxiation from CO
B . loss of air in the sides of the raft
C . rough seas
D . cold water temperature
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When a ship is entering to shallow water, ship resistance will be increased and the speed of main engine reduced.Due to the function of the governor, the main engine will（）
A . reduce fuel feeding
B . increase fuel feeding
C . keep original fuel feeding
D . be overspeed
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As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?（）
A . Compression ratio
B . Fuel/Air ratio
C . Compression pressure
D . Lube oil pressure
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In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove
A . (1) only is correct
B . (2) only is correct
C . both (1) and (2) are correct
D . neither (1) or (2) axe correct
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A dirty intercooler on the ship service air compressor will result in （）.
A . decreased compression ratio
B . higher than normal power consumption
C . un-loader malfunction
D . water in the lubricating oil
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Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A . lower compression pressures
B . overheating without smoking
C . failure to start
D . a run away without load
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（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.
A . Because
B . Owing to
C . For
D . No matter
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The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.
A . inside
B . before
C . after
D . against
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Broken valve strips in an operating low pressure, air compressor will cause （）.
A、an immediate crankcase explosion
B、oil contamination in the compressed air
C、a decrease in compressor capacity
D、no immediate loss of the compressed air capacity
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The unloading system on an air compressor will （）.
A . increase compressor discharge pressure on demand
B . increase compressor operating speed as necessary
C . allow the motor to turn the compressor opposed only by friction
D . reduce the compressor frictional load when starting
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Defective air cooler in a diesel engine will lead to （）.
A . smoky exhaust
B . starting failure
C . overload
D . over speed
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In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A . increasing refrigerant pressure in the coil
B . increasing chilled water flow through the cooler
C . sub-cooling the refrigerant in the condenser
D . superheating the refrigerant in the compressor
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Cleaner heating system will in Beijing to control air pollution.
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If you will send us a catalog by air, we shall ________ very much ．
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Increased air pollution __________ respiratory illness.
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In acceptance sampling, if the sample size is kept the same but the acceptance number is increased, which of the following will be true:
A . buyer's risk will decrease
B . vendor's risk will decrease
C . producer's risk will decrease
D . consumer's risk will increase
E . C and D only
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In international air cargo transportation， a freightforwarder offering a consolidation service will issue its own air waybill.Thisis called（）.
A．MAWB
B．HAWB
C．IATA
D．TACT
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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 engine
B.enter the engine along with the increase in the fuel
C.enter the engine before the increased fuel supply
D.leave the turbocharger as a negative pulse
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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 volume
B.density
C.viscosity
D.calorific value
-
An outside air pressure decreases, thrust output will
A、Increase due to greater efficiency of jet aircraft in thin air
B、Remain the same since compression of inlet air will compensate for any decrease in air pressure
C、Decrease due to higher density altitude
