海船船员考试轮机部三管轮模拟题4(轮机英语)
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Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks ______, and with the control gear in the ______ position, give the engine at least one complete turn.
- A.open / “stop”
- B.closed / “stop”
- C.open / “start”
- D.closed / “start”
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According to Annex IV of comminuted and disinfected sewage using an approved system can be discharged when the ship is more than away from the nearest land.
- A.3 n mile
- B.5 n mile
- C.12 n mile
- D.25 n mile
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Provision must be made in pipe systems for changes in length due to change of temperatureThe bold and italic word “provision” probably means _____.
- A.flanges
- B.nuts
- C.expansion joints
- D.bolts
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A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is ________.
- A.one-half engine speed
- B.the same as engine speed
- C.twice engine speed
- D.four times engine speed
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The booster pump, which supplies diesel oil to , should have a possibility of being powered by compressed air or by emergency power.
- A.the main engines
- B.the auxiliary engines
- C.the emergency generator engine
- D.the auxiliary engines and the main engine(s)
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If the compression ratio is increased on any diesel engine, ________.
- A.the expansion ratio will decrease
- B.combustion will be slowed down
- C.thermal efficiency will decrease
- D.thermal efficiency will increase
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Which of the following statements concerning butterfly valves is correct?
- A.Special tools are required for lapping or grinding
- B.It is impossible to throttle flow with a butterfly valve
- C.To close the valve, it is only necessary to turn the handle a quarter of a turn
- D.The butterfly valve should never be used in a freshwater system
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After fuel tanks have been topped off, which of the listed procedures should be followed next?
- A.The pressure-vacuum relief valve should be reset
- B.The tanks should be made seaworthy to prevent contamination
- C.The tanks should be sounded to make sure the levels are not rising
- D.The tanks should be marked with a bull stamp on the manifold filling valve
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Because the castings of smaller engines are not so big and heavy, _____ and cylinder block may be made in one piece.
- A.the column
- B.the jacket
- C.cylinder cover
- D.cylinder liner
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In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by .
- A.opening more bypass lines
- B.opening additional expansion valves
- C.adding refrigerant
- D.speeding up the machine
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