Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

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• In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）

  A . noise coming from that air starting valve B . continuous operation of the starting air compressor C . zero air pressure in the air starting system D . overheated starting air pipe to the cylinder head

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• Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）

  A . an increase in the exhaust temperature of the affected cylinder B . the turbocharger may surge C . the explosion pressure in all cylinders will rise violently D . smoke from the turbocharger air inlet filter will be see

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• Compared to a low pressure system，generally the air in a high is（）.

  A . warmer，less dense，and less stable B . cool，more dense，and drier C . muggy and cloudy D . extremely moist with high relative humidity

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• A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.

  A . the system is fully charged B . there is air leaking in from the condenser C . ice crystals are forming in the refrigerant D . the system contains less than a full charge of refrigerant

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• In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.

  A . supply clean air to the measuring compartment of the units for more accuracy B . generaate the pressure required for the extraction of the oil mist from the C . generate the pressure required for the extraction of the oil mist from the crankcase D . supply clean air to the measuring track of the units for more accuracy

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• The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

  A . the cylinder head B . the cross-head C . the moving piston D . the stationary pisto

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• A （） in the air delivery line near to each compressor is essential.

  A . butterfly valve B . globe valve C . gate valve D . non-return valve

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• The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.

  A . causes colloid suspension in the cooling water B . reduces the capability of the lubrication system C . can form pockets which block the flow of coolant through the system D . leads to the scuffing of cylinder wall

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• At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.

  A . the lines of force cross the equator on a 0°-180°alignment B . the quadrantal error is 0° C . there is no vertical component of the Earth's magnetic field D . the intercardinal headings have less than 1&deg

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• The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an （）

  A . air compressor B . diffuser C . after-cooler D . ventilator

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• The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.

  A . auto-ignition point B . flash point C . lower explosive limit (LEL) D . threshold limit value (TLV)

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• The joint of the riser in a marine riser system that compensates for heave，the up-and-down motion of a floater，is the（）.

  A . flex joint B . slip joint C . heave joint D . riser joint

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• If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.

  A . too much refrigerant in the system B . oil entrained in the refrigerant C . less than a full charge of refrigerant in the system D . ice crystals forming in the refrigerant

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• In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.

  A . superheated B . saturated C . condensed D . convected

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• The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

  A . air bottle B . air compressor C . crank case D . combustion chamber

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• With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.

  A . increase the exhaust temperature B . increase the power of C . reduce the speed D . increase the fuel consumptio

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• Induced magnetism is found in（）.

  A . hard iron B . soft iron C . vertical iron only D . horizontal iron only

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• A quick and rapid motion of a ship in a seaway is an indication of a(n) （）.

  A . large GM B . high center of gravity C . excessive free surface D . small GZ

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• In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

  A . by an fuel valve B . through an inlet valve C . with an exhaust valve D . from an outlet valve

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• “A souk is an open-air marketplace in an Arab country.” In the sentence, the word “souk” means______.

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• 原文:物体在水中比在空气中轻,这是一个大家共有经验。译文:It is a of common experience that are in water than they are in air.

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• 原文:物体在水中比在空气中轻,这是一个大家共有经验。译文:It is a of common experience that are in water than they are in air.第一空：matter；第二空： bodies；第三空： lighter

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• Chemically induced colon carcinogenesis in rodents is also suppressed by _____ of NSAIDs.

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• When the air in a certain space is squeezed to occupy a smaller space, the air is said to be ______.

  A．commenced B．compressed C．compromised D．compensated

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