When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）

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  A . tape face B . tapered face C . surface D . thinner face

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• In its simplest form the pressure reducing valve is opened or closed by （） which is balanced by the downstream pressure acting on a diaphragm.

  A . adjusting a nut B . a pre-tensioned spring C . any spring D . upstream pressure

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• The crankcase cover should never be allowed to open for investigation when （）

  A . the engine stops B . the engine is running C . you repair the engine D . overhauling the engine

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  A . injection B . penetration C . atomization D . compressio

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• Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）

  A . The amount of fuel injected will be increased B . The start of injection will be retarded C . The nozzle will permit fuel to dribble D . The spray pattern will be distorted

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• The oil pressure and flow from each bearings can be checked when（）

  A . the lubricating pumps are stopped and the access doors are opened B . the lubricating pumps are running and the access doors are opened C . the engine is running and the access doors are closed D . the engine is stopped and the access doors are closed

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• How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）.

  A . With gooseneck vents B . With warning signs C . With flame screens D . With pressure-vacuum relief valve

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  A . Ⅰonly B . Ⅱonly C . bothⅠand Ⅱ D . neitherⅠnor Ⅱ

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• When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.

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• The rim of the piston may contain cut-out portions to accommodate （） when they open.

  A . the gases B . the air C . the valves D . the injector

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  A . liquid strainer B . refrigerant inlet of the condenser C . inlet side of the evaporator D . suction side of the compressor

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• When the relief valve is used as a constant pressure valve, it is connected to the outlet of the hydraulic pump to ensure that the outlet pressure of the hydraulic system (pump) is constant.

  A:正确; B:错误

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• When the pressure gets low, the boiling-point becomes low. 气压变低，沸点就变低。

  A．omission B．combination C．addition D．obverse

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