Fuels of different qualities may

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If the engine _____ for a long period, there will be a danger of frost.
- A.must to stand inoperative
- B.has to stand inoperative
- C.must be stood idle
- D.will stand idle
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If a line at right angles to the axis rotates about that axis and, at the same time, moves parallel to the axis, it will generate _____.
- A.a helix
- B.a helicoidal
- C.a curve
- D.a cone
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If the surveyors ______ yesterday, they would have finished the survey work.
- A.did not interrupt
- B.were not interrupted
- C.had not interrupted
- D.had not been interrupted
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In the _____ refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.
- A.open-type
- B.hermetic
- C.semi-hermetic
- D.all the above
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All personnel should be familiar with the lifeboats _____.
- A.boarding and operating procedures
- B.maintenance schedule
- C.navigational systems
- D.fuel consumption rates
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The trim of a vessel is the _____.
- A.value of the mean draft
- B.degree of list
- C.amount of roll
- D.difference in fore and aft drafts
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When carrying out mooring trial, if the M.Ecan’t start normally, you should ____.
- A.take a further inspection in the voyage
- B.check and repair, then retrial
- C.do as the surveyor’s requirement
- D.retrial
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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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Which of the following statements is correct concerning diesel engine cooling water systems?
- A.Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation
- B.propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder
- C.At least two independent sea sucti8ons are to be provided for supplying water to the engine jackets or to the heat exchangers
- D.Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling
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In diesel engineering practice, the term used to express the ignition quality of a particular fuel is＿.
- A.cetane number
- B.octane number
- C.ignition index number
- D.volatility point
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Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the ______, then a saving in fuel can be achieved.