Heat damage to fuel injection nozzles can be prevented by avoiding ____.
A.excessive fuel oil temperature
B.long periods of engine overload
C.metallic contact between nozzles and cylinder heads
D.hard carbon deposit and varnish on the nozzles
第1题
A.employing fuel oil as a cooling medium
B.preventing hard carbon deposit on nozzle tips
C.avoiding fuel oil temperature exceeding builder’s specification
D.ensuring good metallic contact between nozzles and cylinder heads
第2题
A.To prevent internal damage form. local overheating
B.To ensure the fuel nozzles are flushed clean
C.To clear the smoke stack
D.To let the waste heat boiler reduce its rate of steam generation
第3题
听力原文: NASA is examining photos of Space Shuttle Endeavour after discovering what appears to be damage to a critical heat protection tile. Ice is believed to have broken off the external fuel tank during lift-off and struck the shuttle.
NASA wants to study the problem before choosing a course of action. Photos taken of Endeavour's belly by the crew of the International Space Station shows a three-inch-by-three-inch gouge in at least one black heat tile under the shuttle's right-hand wing near one of the main landing gear doors. NASA's John Shannon says if the damage is life-threatening and too extensive to repair, a rescue shuttle could be sent to save the astronauts.
NASA runs such analysis every single flight. Up to now, Space Shuttle Endeavour has at least 68 days of consumables to support ten crew members and NASA can get a shuttle ready by October 5th.
Repair options include a heat resistant paint, a protective plate that could be screwed into the gouge place or a thick compound that can be squirted.
Where is the damage gouge located in Space Shuttle Endeavour?
A.In one black heat tile under the right wind.
B.In one of the main landing gear doors.
C.In one black heat tile under the left wind.
D.In the middle of Endeavour's belly.
第4题
Heat energy is a source of power, but _____ will cause damage to the engine.
A.excessive heat
B.insufficient heat
C.effective cooling
D.high output
第5题
Fuel injected into a diesel engines cylinder is ignited by _____.
A.the heat compressed fuel/air mixture in the cylinder
B.the fuel igniter
C.the fuel injector
D.the fuel pump
第6题
A、electricity and hydrogen
B、water and oxygen
C、electricity, heat and water
D、energy, water vapor, and oxygen
第7题
Fuel is ignited in a diesel engine cylinder by _____.
A.a spark plug
B.injectors
C.the heat of compression
D.increasing jacket water temperatures
第8题
A.the heat
B.the fuel
C.the oxygen
D.any of the above
第9题
A.carbon dioxide
B.oxygen
C.carbon monoxide
第10题
A.electronic ignition system
B.compression of air by the piston
C.friction in the fuel injector
D.fuel oil bearing system
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