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

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• In the two stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?（）

  A . Condenser circulating water pump B . Feed-water heater drain pump C . Distillate pump D . Air ejector condenser drain pum

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• The suction - force principle of operation is a typical characteristic of （）.

  A . centrifugal pumps B . jet pumps C . propeller pumps D . reciprocating pum

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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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• Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use（）.

  A . Gun tackle B . Luff tackle C . Two-fold tackle D . Double-luff tackle

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• The three basic parts of any eductor are the nozzle, the suction chamber, and the （）.

  A . injector B . compressor C . diffuser D . sipho

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• Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

  A . of the diaphragm type B . of the centrifugal type C . of the positive displacement type D . independently driven by electric motor

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• 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?（）

  A . one B . two C . three D . four

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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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• An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

  A . aeration of the oil B . contamination of the oil C . pump cavitation D . spongy actuator movement

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• If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

  A . a low load on the unit B . a clogged pump suction strainer C . a blockage in the line between the pump and hydraulic motor D . the hydraulic motor turning too fast

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• The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.

  A . a warp end B . a mooring winch C . a worm gear D . a barrel

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• The hatch at the after end of the canopy in a lifeboat（）the after lifting hook, painter, and tow line.

  A . give access to B . links up with C . have contact with D . is constructed of

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• Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）

  A . The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow B . The pump packing gland overheats after short operating periods C . The motor over-current protective device continually shuts the pump down D . Pounding noises can be heard at the pump suction chest

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• When operating with a negative suction head, which of the following types of pumps will require priming?（）

  A . Reciprocating B . Centrifugal C . Rotary D . Gear

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• Stress on the topping lift of a swinging boom can be reduced by（）.

  A . rigging a back stay B . raising the boom C . increasing the mechanical advantage of the cargo purchase D . taking all slack out of the preventer

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• The part of the anchor windlass that engages the anchor chain for lifting is called the （）.

  A、Cranes B、Winches C、Capstans D、Windlass

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• Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）

  A . Increased suction head pressure B . Decreased feedwater temperature C . Pump recirculating line being open too much D . Excessive feedwater temperature

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• The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.

  A . fuel valves of main engine B . injector pump of main engine C . safety valves of marine boiler D . safety valves of a reciprocating pum

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• Which statement is TRUE concerning the tandem working arrangement of pedestal cranes when completing a quad lift? （）

  A . The discharge is slow due to the size of the cargo and all the cranes working together B . The cargo discharge can be accomplished with controlled pendulation C . The cargo discharge can be performed in port or at anchor D . The cranes enable the handling of heavy cargos without shoreside assistance

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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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• Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

  A . positive displacement B . ejector C . centrifugal D . air compressor

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• Among the four strokes of a four-stroke diesel engine,suction and expansion strokes are the upward strokes.()

  此题为判断题(对，错)。

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• Morning clouds lifting out of the Longwood valley______obscure the highest mountain in the region.

  A．part B．partial C．partially D．partiality

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