If the needle valve in a fuel injection nozzle sticks open （）.

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• If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）

  A . have a larger than normal dead band B . produce excessive speed response to a load change C . respond slowly to any change in engine load D . stabilize engine speed at the new governor setting

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• In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.

  A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

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• The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.

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

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• A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.

  A . a pressure reducing valve B . a pilot valve C . an operating piston D . downstream pressure

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• In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.

  A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

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• The bypass valve on a self-contained breathing device should be opened if（）.

  A . you are entering a space containing poisonous vapors B . you are entering a space containing explosive gases C . the regulator of the breathing apparatus malfunctions D . the face piece of the breathing device is too tight

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• A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.

  A . open B . close C . remain in its position D . flood the evaporator with refrigerant

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• If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）

  A . a low level in the engine expansion tank B . excessively high coolant pressure C . improper temperatures D . malfunctioning of the jacket water heater

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• The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

  A . will lift B . will be lifted C . will close D . will be closed

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• The intake valves in a diesel engine are reseated by （）.

  A . cam followers B . push rods C . combustion gases D . valve spring

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• If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

  A . a low load on the unit B . a clogged pump suction strainer C . a blockage in the line between the pump and hydraulic motor D . the hydraulic motor turning too fast

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• The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.

  A . because B . though C . since D . until

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• A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.

  A . annular blowout preventer B . annulus C . accumulator D . automatic choke

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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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• If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

  A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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• A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.

  A . evaporator pressure decrease B . evaporator coil over-feed C . evaporator capacity increase D . expansion valve diaphragm rupture

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• Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）

  A . Common-rail injection B . Air injection C . Jerk pump injection D . Distribution injectio

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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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• Differential needle valves used in fuel injectors are directly closed by（）

  A . cam action B . spring force C . fuel oil pressure D . firing pressure

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• If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）

  A . liquid in the cylinder B . low compression in the cylinder C . high exhaust temperature D . poor fuel penetratio

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• A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.

  A . return to a neutral position B . flood the evaporator C . open D . close

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• Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）

  A . maximum power at a normal load B . maximum power and load under normal conditions C . half speed and normal temperature D . normal operating temperature without a load

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• If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）

  A . valve will open later B . valves will close later C . amount of fuel injected will be increased D . amount of fuel injected will be decreased

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