The amount of fuel delivered by a unit injector is controlled by the （）

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• The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.

  A . quantity of fuel to be received B . flash point of the fuel as it is received C . fuel temperature as it is received D . viscosity of the fuel being received

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• The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.

  A . metering B . timing C . rate of injection D . rate of distributio

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• As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.

  A . being compressed B . to be pumped up C . is pressurized D . are built u

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• The cetane rating of diesel fuel is an indication of the（）

  A . ignition quality of the fuel B . calorific value of the fuel C . flash point of the fuel D . rate of fuel consumptio

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• Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）

  A . Glazing of the cylinder liners B . Increase valve wear C . Excessive oil pumping D . Increase fuel consumptio

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• what kind of products do the air carriers deliver? （）

  A . The high value B . Low density or weight C . A and B D . Shortest time to transport

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• The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）

  A . Proper timing B . Accurate metering C . Suitable injection rate D . Suitable atomization rate

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• Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.

  A . 97 times greater B . 94 times greater C . 10 times greater D . 2 times greater

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• The amount of fluid delivered by a screw pump can be regulated by （）.

  A . throttling the pressure line B . changing the speed of the rotor C . either A or B D . None of the above is tree

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• The amount of fluid delivered by a gear pump can be regulated by （）.

  A . throttling the pressure line B . changing the speed of the rotor C . either A or B D . None of the above is true

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• The rate of expansion of heated fuel oil varies with the （）.

  A . conductivity B . viscosity C . volume D . specific gravity

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• On a diesel engine, fuel is delivered into the combustion space by （）.

  A . a cooling system B . a lubrication oil system C . an electric system D . an injection system

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• The amount of fluid delivered by a helical pump can be regulated by （）.

  A . throttling the pressure line B . changing the speed of the rotor C . either A or B D . None of the above is tree

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• It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.

  A . inlet port B . exhaust port C . spill port D . scavenge port

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• Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

  A . Overcoming sliding friction B . Overcoming rolling friction C . Overcoming fluid friction D . Overcoming oil wedge frictio

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• The amount of fluid delivered by a reciprocating pump can be regulated by （）.

  A . throttling the pressure line B . changing the speed of the piston C . either A or B D . None of the above is tree

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• The Vessel to be delivered and placed at the（）of Charterers during office hours.

  A . disposal B . control C . operation D . optio

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• （）shall the amount of compensation from PICC exceed the insured amount of the insured ship.

  A . In any case B . In case C . In no case D . In case of

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• The amount of fluid delivered by a centrifugal pump can be regulated by （）.

  A . throttling the pressure line B . changing the speed of the rotor C . either A or B D . None of the above is tree

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• The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）

  A . the firing pressure in the cylinder B . a metering helix inside the pump C . varying the physical length of the plunger stroke D . varying the clearance between the injector cam and the injector rocker arm

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• The insurer is obliged to make indemnity up to the amount of ________, or up to the amount of the amount insured, or up to the amount of insurable interest.

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• The amount of water used in the manufacturing process is enormous, but the amount wasted is______.

  A．the greatest B．more greater C．greatest D．even greater

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• Todays low gasoline prices make consumers willing to indulge their preference for larger cars, which consume greater amounts of gasoline as fuel. So United States automakers are unwilling to pursue the development of new fuel-efficient technologies aggressively. The particular reluctance of the United States automobile industry to do so, however, could threaten the industrys future. Which of the following, if true, would provide the most support for the claim above about the future of the United States automobile industry？

  A．A prototype fuel-efficient vehicle, built five years ago, achieves a very high 81 miles per gallon on the highway and 63 in the city, but its materials are relatively costly. B．Small cars sold by manufacturers in the United States are more fuel efficient now than before the sudden jump in oil prices in 1973. C．Automakers elsewhere in the world have slowed the introduction of fuel-efficient technologies but have pressed ahead with research and development of them in preparation for a predicted rise in world oil prices. D．There are many technological opportunities for reducing the waste of energy in cars and light trucks through weight, aerodynamic drag, and braking friction. E．The promotion of mass transit over automobiles as an alternative mode of transportation has encountered consumer resistance that is due in part to the failure of mass transit to accommodate the wide dispersal of points of origin and destinations for trips.

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• The par value of a stock is the minimum amount of capital of the corporation existing

  是 否

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