During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）

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• Valve overlap is the period during which （）.

  A . the inlet valve is open B . the exhaust valve is open C . both valves are closed D . both valves are ope

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• A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

  A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

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• What is the minimum recommended access point overlap for voice roaming？（）

  A . less than 10 percent B . 10 to 15 percent C . 15 to 20 percent D . 25 to 30 percent

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• In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

  A . downwards；upwards B . upwards；downwards C . downwards；downwards D . upwards；upward

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• If two windows overlap， which window attribute will determine whether one should be chosen over the other？（）  

  A .  WINDOW_PRIORITY B .  PRIORITY C .  PRIORITY_LEVEL D .  WINDOW_PRIORITY_LEVEL E .  OVERLAP_RULE

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• Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.

  A . improving cylinder scavenging B . preheating the combustion chamber C . reducing air charge density D . preventing valve wear

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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• The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

  A . be jammed B . be opened C . be seated D . be broke

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• Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

  A . closing later B . opening sooner C . staying open for a shorter period of time D . staying open for a longer period of time

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• The period of valve overlap is when （）.

  A . the inlet valve is open B . the exhaust valve is open C . both valves are close D . both valves are ope

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• During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）

  A . chief engineer B . surveyor C . the engineer D . the technique personnel of the shipyard

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• If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.

  A . open；short；after B . closed；short；after C . open；long；before D . closed；long；before

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• 制动油路中P阀（Proportional Valve）之主要功用为（）

  A . 增大后轮制动力 B . 使车辆能在滚动状态下煞住 C . 防止后轮比前轮先煞住 D . 增大前轮制动力

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• During （）, the starting air valves should be closed to prevent the engine from turning.

  A . overhaul B . running C . blowing down D . All of the above are correct

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• Mariners should pay much attention in the overlapped area owing to（）.

  A . complicated circumstances B . changeable atmospheric pressure C . large density of traffic D . some strong signals from unwanted satellite

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• The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices during （）

  A . the upward stroke B . the downward stroke C . the power stroke D . the suction stroke

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• why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.

  A . the weather over there is always terrible B . the condition there is complicated C . the signals are too strong D . their SES may receive the signals from unwanted satellite

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• During the inspection, the starting air valves should be closed （） the engine from turning.

  A . to increase B . to speed up C . to prevent D . to reduce

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• The stages of a lesson overlap.（）

  A . 正确 B . 错误

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• Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）

  A . inevitable B . harmful C . helpful D . unacceptable

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• The job share partners need to have some overlap time to work together.

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• Use the following information to answer Questions 32 and 33.At the beginning of the year, Company P purchased 1,000 shares of Company S for $80 per share. During the year, Company S paid a divide

  A．（$1,000） （$1,000） B．（$1,000） $4,000 C．（$5,000） $4,000

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• During the dock repair, each sea valve must be disassembled, cleaned and ground wellBefore it reassemble the sealing surface between the valve and the valve seat should be checked by ____.

  A.chief engineer B.surveyor C.the engineer D.the technique personnel of the shipyard

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• I wish to advise you that during the loading operation at about 7:30 p．m．yesterday one case containing Glass Goods marked “DEF” was ______ to slip off the net sling and fell a distance of about 40 feet into the Lower Hold．

  A.done B.caused C.allowed D.followed

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