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Fuel oil tanks must be fitted with （） that can be closed rapidly and remotely in the event of an emergency such as a fire.
A . stop valves
B . non-return valves
C . quick closing valves
D . relief valve
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Dirt in the fuel oil system of a diesel engine can cause （）.
A . clogged filters
B . poor combustion
C . overloading of the diesel
D . shock of fuel line
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Excessive alkalinity of the water in an auxiliary boiler can cause （）.
A . caustic embrittlement of the boiler metal
B . acidic corrosion of the boiler metal
C . hard scale deposits on the boiler tubes
D . etching of the heat exchange surface
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If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）
A . a dirty lube oil strainer
B . internal water leaks
C . an oil suction line restriction
D . excessive wears of the cooling water pum
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In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A . An open vent in the cooling system
B . A fouled sea chest
C . A restricted water passage in the engine
D . Air entrained in the cooling water
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The stability of a vessel is normally the greatest when all fuel and water tanks are full because the （）.
A . center of gravity is lowered
B . center of buoyancy is lowered
C . reserve buoyancy is unchanged
D . hull freeboard is increased
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Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
A . an increased flash point
B . higher lube oil pressures
C . an increased viscosity
D . lower lube oil pressure
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While taking on fuel, you notice oil on the water around the vesselWhich of the following actions should be taken FIRST?（）
A . Stop fueling
B . Notify the dispatcher
C . Notify the terminal superintendent
D . Determine if your vessel is the source
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The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tank
A . Ⅰonly
B . Ⅱ only
C . bothⅠand Ⅱ
D . neitherⅠor Ⅱ
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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.
A . BHP
B . MCR
C . IHP
D . MEP
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Impurities from the boiler water surface can be removed through the （）.
A . safety valve
B . blow down valve
C . scum valve
D . feed check valve
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A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter
A . Ⅰonly
B . Ⅱonly
C . eitherⅠorⅡ
D . neitherⅠnor
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The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.
A . seawater contamination
B . frequent surface blows
C . dissolved oxygen deaeration
D . frequent bottom blow
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Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A . lower compression pressures
B . overheating without smoking
C . failure to start
D . a run away without load
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Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.
A . a specific barometric pressure
B . a specific temperature
C . a specific wind speed
D . any time
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If you detect oil in the water around your vessel while discharging fuel, the FIRST thing to do is（）.
A . try to find out where the oil is coming from
B . call the Master
C . have the pump man check the discharge piping
D . shutdown operatio
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In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A . increasing refrigerant pressure in the coil
B . increasing chilled water flow through the cooler
C . sub-cooling the refrigerant in the condenser
D . superheating the refrigerant in the compressor
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The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A . operating the boiler at less than normal water level
B . installing fins on the firesides of water-tubes
C . increasing the amount of excess air to the burners
D . treating the boiler water with chemical oxygen scavenger
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A chemist can _the oxygen from hydrogen in water.
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Which of the following idioms best suggests “the person’s heart can be reflected in clear water”?
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People in Bangladesh can use____as a safe source of drinking water.
A．ground water
B．rainwater
C．drinking water
D．fresh water
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Water pollution can't affect nature's balance in oceans, lakes and rivers.
A．Y
B．N
C．NG
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In some ways, the human body is both like a furnace and like an engine. It must have fuel to produce heat as a furnace【C1】______. It must have fuel to produce motion and do【C2】______as an engine does. The nutrients(营养物)which【C3】______energy best are carbohydrates(碳水化合物)and fats. Protein can also be used as fuel. Minerals, vitamins, and water,【C4】______extremely valuable to the body, cannot be used as fuel.
If the body takes in more carbohydrates【C5】______are used for energy, the【C6】______is stored. Two storage places are the liver(肝)and muscles. There is a【C7】______, however, to the amount of carbohydrates they can【C8】______. When they are filled and they always【C9】______be for you to feel your best, excess carbohydrates are changed to fat and【C10】______around the body.
If the body does not take【C11】______a sufficient amount of food, it will use its stored fat for energy. If you【C12】______at all, the body would use up all the stored fats and【C13】______it would use its own protein in order to keep【C14】______as long as possible.
Therefore, the【C15】______amount of food you eat should be in【C16】______with your energy requirements. It is not necessary,【C17】______, for you to go【C18】______counting calories(卡路里)and weighing food. If a person is the【C19】______weight, it is safe to【C20】______that he is eating enough.
【C1】
A．has
B．needs
C．does
D．is
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A．To move it in water till it can swim.
B．To take the hook out of its stomach.
C．To keep it in a bucket for some time.
D．To let it struggle a little in your hand.
