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单选题
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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单选题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
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单选题The period of valve overlap is when （）.A
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单选题If the needle valve in a fuel injection nozzle sticks open （）.A
no fuel will be delivered through the nozzleB
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valve will open laterB
valves will close laterC
amount of fuel injected will be increasedD
amount of fuel injected will be decreased
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be fitted with a positive fuel shut-off valve located at the tankB
have a shut-off valve at the top of the tankC
have a gate valve easily accessible in the space where the tank is locatedD
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solenoid valve to seizeB
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ensure the needle valve is flushed clean during each injectionC
prevent combustion gas blowback into the open needle valveD
prevent reflected pressure waves when the needle valve closes
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单选题When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.A
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continue to operate as if the system were in operationC
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always be completely closed until the compressor restarts
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the relief valve should open and let excess refrigerant go to receiverC
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Increased viscosity of the product needs higher loading pressure, which increases the chances of a spillB
Air pockets may cause the fuel to bubble out of the ullage holeC
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Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
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spring forceC
fuel oil pressureD
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late fuel injectionB
early fuel injectionC
high exhaust temperature from that cylinderD
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allow oil backflow from the injector to the helixC
reduce fuel oil pressure between injection strokesD
meter the quantity of fuel delivered
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单选题When the heat load begins to increase, the needle valve of an expansion valve will（）A
move in an opening directionB
move in a closing directionC
either open or closeD
not move at all
考题
单选题Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）A
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考题
单选题Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）A
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考题
单选题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 nutB
a pre-tensioned springC
any springD
upstream pressure
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单选题The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）A
governor flyweight action on a pilot valve which controls fuel injectionB
governor flyweight motion acting on fuel controls through suitable linkageC
positioning a butterfly valve in the fuel delivery system positioningD
a servomotor piston attached to the fuel controls
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the compressor to huntC
flash gas to form in the liquid lineD
the expansion valve to freeze open
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