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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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A common trouble with the fuel pump plungers or fuel valve spindle is （）.
A . broken down
B . stuck
C . oil leakage
D . carbonized
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（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.
A . Bad combustion of the fuel
B . Bad atomization of the fuel
C . Liquid contaminants
D . Solid contaminant
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Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passages
A . (1)+(2)
B . (1)+(3)
C . (2)+(3)
D . (1)+(2)+(3)
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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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In a typical fuel system, the oil is stored in （） in the double bottom.
A . setting tanks
B . service tanks
C . tanks
D . drain tank
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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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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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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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Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）
A . erosion and cratering of the nozzle orifices
B . fuel leakage into the nozzle drain line
C . fuel leakage before and after injection
D . insufficient fuel delivery though that nozzle
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The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as （）.
A . injection
B . penetration
C . atomization
D . compressio
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If the needle valve in a fuel injection nozzle sticks open （）.
A . no fuel will be delivered through the nozzle
B . the nozzle will overheat and crack
C . time of injection will change
D . fuel will leak into the drain line
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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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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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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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Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A . double bottom fuel oil tank temperature
B . heater supply steam flow
C . pressure of the fuel supplied to the burners
D . attemperator steam flow in the heater discharge circuit
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Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A . lower compression pressures
B . overheating without smoking
C . failure to start
D . a run away without load
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A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）
A . carbon
B . vanadium
C . calcium
D . hydroge
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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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A common trouble with the fuel pump plunger or fuel valve spindle is （）.
A . water leakage
B . steam leakage
C . oil leakage
D . air leakage
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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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The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A . assist in a quick cutoff of fuel injection
B . allow oil backflow from the injector to the helix
C . reduce fuel oil pressure between injection strokes
D . meter the quantity of fuel delivered
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The primary function of a fuel delivery check valve assembly is to（）
A . deliver proper fuel quantity to the injection nozzle
B . provide rapid fuel injection cutoff
C . control fuel quantity entering the pump body
D . control fuel pressure delivered to the combustion chamber
