The temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.

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  A . sensible heat B . latent heat C . total heat D . residual heat

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• The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

  A . Cross B . Parallel C . Counter D . Circular

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• A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）

  A . decrease B . increase C . decrease to zero D . remain unchanged

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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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• As the temperature for a given mass of air increases，the（）.

  A . dew point increases B . dew point decreases C . relative humidity increases D . relative humidity decrease

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• If a diesel engines exhaust temperature is abnormally high, the cause could be（）

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• The cooling water temperature （） over a period of 8 hours, and then shut down.

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• Increasing the temperature of a fuel will reduce its （）.

  A . viscosity B . pressure C . resistance D . setting point

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• In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）

  A . raw water pump discharge B . expansion tank outlet C . cooling water heat exchanger D . outlet engine jacket water outlet

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• The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.

  A . low viscosity index B . high viscosity index C . high neutralization number D . low demulsibility quality

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• The temperature of a refrigerant gas is the highest （）.

  A . at the compressor discharge B . at the compressor suction C . in the expansion valve D . in the receiver

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• If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

  A . a broken shaft on the freshwater pump B . an excessive accumulation of scale exchanger C . an incorrect thermostatic element operating range D . lube oil in the cooling water

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• Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）

  A . low temperature hardening B . case hardening C . annealing D . tempering

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• In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.

  A . evaporator B . compressor C . expansion valve D . condenser

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  A . dew point increase B . dew point decreases C . relative humidity increases D . relative humidity decrease

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• Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.

  A . freezing point B . floc point C . condensing temperature D . compression temperature

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• The flash point of a liquid refers to the temperature （）

  A . at which a liquid will give off inflammable vapors B . at which a liquid will burn steadily C . at which a liquid will explode D . that a liquid must reach before it will flow readily

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• Among the rings of a piston the （） one is subjected to the greatest load and temperature.

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• The temperature of the earth depends on a _______ which is given by the sun.

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• The temperature of the world in the past ten years has dropped a little______.

  A．because wind and rain changed the weather B．the drop in the temperature would have effects on wind and rain C．because wind and rain did not change the weather D．the drop in the temperature would not have effects on wind and rain

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• In such a case it is desired that the metal___at a lower temperature.

  A．A.melt B．B.must melt C．C.would melt D．D.had melted

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• The temperature of frozen Fargo is______for a full week.

  A．six degrees below zero B．twenty degrees or more below average C．single digit or below zero D．below zero

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• Choose the best option for the sequence of A and B. Once the gas cloud has reached a certain temperature, it is hot enough for nuclear fusion to take place. A= nuclear fusion takes place B= the gas cloud reaches a certain temperature

  A、A happens first B、B happens first C、A and B happen at approximately the same time D、Not given

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• Which of the following would lead to an increase in the vapor pressure of a liquid I. Increasing the temperature II. Adding a nonvolatile

  A．I only B．II only C．Both I and II D．Neither I nor II

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