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自考10012轮机英语(二)模拟试题3

试题数量：50道
免费次数：登录后，试做1次
练习次数：227次
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试卷简介

该试卷共包含50道试题，试题类型如下:

单选题

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1、[单选题]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during______for new piston rings.
- A.the running-in period
- B.The running process
- C.gas exchange process
- D.the boiler firing
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2、[单选题]All three systems have the ports _____ to swirl the incoming air and direct it in the appropriate path．
- A.angled
- B.rounded
- C.being angled
- D.being rounded
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3、[单选题]Although the crankshafts of medium diesel engines appear to be robust，they rely on the appropriate of _____ to develop the their full strength．
- A.the piston rods
- B.the crank throws
- C.the thrust bearings
- D.the main bearing
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4、[单选题]Aluminum pistons have _____ coefficient of thermal expansion compared with those of cast iron．
- A.higher
- B.lower
- C.the same
- D.none of the above
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5、[单选题]Among the ring of a piston the _____ one is subjected to the greatest load and temperature．
- A.bottom
- B.middle
- C.top
- D.none of the above
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6、[单选题]An aluminum piston has lower inertia and higher coefficient of _____ compared to that of cast iron．
- A.viscosity
- B.twisting moments
- C.inertia
- D.thermal expansion
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7、[单选题]An electrically driven automatically operating auxiliary blower is provided for slow speed and _____ of a low speed diesel engine．
- A.manoeuvring operations
- B.bad co mbustion
- C.cooling
- D.mooring trial
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8、[单选题]An increase in load on a diesel engine results in _____ of speed of the crankshaft．
- A.a reduction
- B.an increase
- C.an outing
- D.a downwards
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9、[单选题]An indicator diagram is a pressure-volume graph taken from the pressure in the _____ of a working engine．
- A.crankcase
- B.fuel pump
- C.scavenge trunk
- D.cylinder
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10、[单选题]An overspeed safety device is usually fitted to a generator engine for _____ in the event of overspee
- A.cutting power off the engine
- B.increasing the fuel pump setting
- C.braking the crankshaft
- D.stabilizing the ship speed
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11、[单选题]As a heat engine，_____ energy is the source of power by which the diesel engine can be operate
- A.electric
- B.heat
- C.mechanical
- D.exhaust
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12、[单选题]As for a diesel engine，lack of combustion air may be dne to _____.
- A.fouling turbine
- B.fuel pump faults
- C.lubrication failure
- D.excessive cooling
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13、[单选题]As the plunger moves up，the ports are closed and the fuel _____ and delivered to the injector nozzle at very high pressure．
- A.being compressed
- B.to be pumped up
- C.is pressurized
- D.are built up
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14、[单选题]At least _____ cylinder in a two-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position．
- A.6
- B.12
- C.4
- D.8
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