单项选择题The temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.

A.at which/to which
B.from which/at which
C.to which/from which
D.in which/on which

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1.单项选择题Special thrust devices are provided on ships to improve their （） at zero ship speed when the rudder is relatively ineffective.

A.brake capabilities
B.reversing capabilities
C.maneuvering capabilities
D.acceleration capabilities

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2.单项选择题The auxiliary steering gear must be capable of being brought speedily into operation and be able to put the rudder over from 15 degrees on one side to 15 degrees on the other side in no more than （） with the ship at its deepest service draught and running ahead at the greater of one half of the maximum service speed or （）.

A.28 seconds；7 knots
B.28 seconds；14 knots
C.60 seconds；7 knots
D.60 seconds；14 knots

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3.单项选择题The main steering gear must be able to steer the ship at maximum ahead service speed and be capable at this speed, and at the ships deepest service draught, of putting the rudder from 35 degrees on one side to 30 degrees on the other side within no （）.

A.more than 28 seconds
B.more than 60 seconds
C.less than 28 seconds
D.less than 60 seconds

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4.单项选择题Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）

A.Sodium hydroxide
B.Sodium carbonate
C.Sodium nitrate
D.Sodium polyphosphate

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5.单项选择题Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and （） in size.

A.expand
B.extract
C.increase
D.decrease

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6.单项选择题When in operation, it is unavoidable that a small amount of oil （） through leakage, and in order to compensate for these leaks the system is connected to a feed pump.

A.escapes
B.overheats
C.expands
D.accelerates

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7.单项选择题For a L√Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will （）.

A.be interrupted
B.move downwards
C.move outwards
D.retain original position

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8.单项选择题Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

A.Height of the machine
B.Temperature of the liquid seal
C.Gravity disc
D.Bowl diameter

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9.单项选择题Which of the following is NOT on the list items to be recorded in Oil Record Book Part I (machinery space operation)?（）

A.Accidental discharge of oil
B.Disposal of oil residues
C.Quantity of water produced by FWG
D.Discharge of dirty ballast or cleaning water from fuel oil tanks

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10.单项选择题All bilge suctions must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor plate level for easy access.

A.strangers
B.relief valves
C.emergency valves
D.strainers

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The major source of chemical contaminants in hydraulic fluid is （）.

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One cause of high head pressure occurring in a refrigeration system can be （）.

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A salinity indicator is used to determine the （）.

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Which of the listed pumps is NOT a positive displacement pump?（）

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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.

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When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.

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An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.

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If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

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