A bilge suction line，in a fishing vessel with more than 16 individuals aboard，must have a strainer with an open area not less than how many times the open area of the suction line?（）

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• A short splice in a line（）.

  A . decreases the size of the line B . should be used if the line is going through a block C . should only be used in wire rope D . doubles the size of the line

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• 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 . strainer

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• It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.

  A . head capacity to improve B . discharge to be reversed C . efficiency to decrease D . slippage to decrease

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• Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.

  A . cavitation B . electrolysis C . abrasion D . corrosio

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• A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.

  A . have a greater head capacity B . operate with increased impeller efficiency C . discharge through the suction side of the pump casing D . require more power to run the shaft

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• In a storm，the leeward lines of a ship’s mooring system will（）.

  A . pull the unit in the same direction that the weather is pushing it B . pull the unit in the opposite direction that the weather is pushing it C . tend to keep the unit on its original location over the well head D . affect the unit's draft and inclination as maximum mooring tensions are reached

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• The emergency bilge suction valve is typically used （）.

  A . to inject cleaning additives when the bilges are extremely dirty B . when the main condenser becomes fouled, in order to provide additional cooling water circulation C . to connect the rose box to the independent bilge suction D . if the bilges become flooded and they can not be emptied by any other mea

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• The emergency bilge suction or bilge （） is used to prevent flooding of the ship.

  A、injection valve B、relief valve C、discharge valve D、inlet filter

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• When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.

  A . air chamber B . head lank C . primer D . prime mover

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• What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.

  A . Bends in the piping B . Slowing the pumping rate C . Pipeline valves D . Backing rings for pipe weld

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• A warmer than normal compressor suction line might be caused by （）.

  A . insufficient lubrication B . insufficient refrigerant C . excess refrigerant D . excessive opening of the expansion valve

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• In a storm，the windward lines of a ship’s mooring system provide（）.

  A . a positive righting moment B . an increase in KM C . a negative restoring force D . a positive restoring force

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• An independent bilge suction is required for （）.

  A . ballast tanks B . sludge tanks C . machinery space bilges D . cargo hold bilge

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• A long splice in a line（）.

  A . is used in running rigging B . doubles the size of the line C . is only used on fiber rope D . is very weak

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• When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）

  A . The high temperature facilitates primary gravity separation B . Most of the oil and organic solvents are raised to the top layer C . The high the temperature is, the more the top oil will be collected D . The high temperature has little use on the separation of emulsified oil

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• A vessel displaying three red lights in a vertical line is（）.

  A . restricted in her ability to maneuver B . not under command C . engaged in mineclearing operations D . constrained by her draft

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• When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.

  A . flooding back B . superheating C . overflowing D . recycling

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• The emergency bilge suction or bilge injection valve is used to prevent （） of the ship.

  A . proceeding B . overloading C . collision D . flooding

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• All bilge suction must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor-plate level for easy access.

  A . strainers B . valves C . elements D . separator

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• The static suction lift of a pump is the difference in elevation between the （）.

  A . centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump B . centerline of the pump and the suction liquid level when the source of liquid is above the pump C . centerline of the pump and the level of the discharge liquid D . liquid levels of the suction and discharge

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• The lubricating oil is pumped from the drain tank, very often with （） in the suction line.

  A . a filter B . a strainer C . a magnetic filter D . a fine strainer

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• A pressure drop in the liquid line of a refrigeration system may cause（）

  A . the solenoid valve to seize B . the compressor to hunt C . flash gas to form in the liquid line D . the expansion valve to freeze ope

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• A line of position formed by sighting two charted objects in line is called a(n)（）.

  A . relative bearing B . range line C . track line D . estimated positio

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• A vessel in ocean service that does not have an approved means of processing oily bilge slops or oily ballast must have（）.

  A . a fixed piping system for ballast discharge to a reception facility B . a discharge outlet for the ballast system on each side of the weather deck C . one portable adapter for a shore connection to the ballast line D . All of the above

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