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名词解释题
压力负荷过度(excessive pressure load)
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gearB
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单选题A dirty intercooler on an air compressor will cause ().A
damage to the un-loader operating diaphragmB
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scavenge air pressureD
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carbon buildup in the exhaust manifoldB
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eroded muffler baffle platesD
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inspecting thermal and mechanical condition of the engineC
inspecting each system and exhaust temperatureD
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Indicated exhaust pressure readings will increaseB
Pyrometer responses will be retardedC
Indicated cylinder temperature readings will increaseD
Indicated firing pressure readings will increase
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单选题When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average ()A
air quantity aspiratedB
fuel injection pressureC
combustion pressure on the power strokeD
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单选题Which of the following will take place if the clearance of the main bearings are excessive?()A
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dropping of pressure of LOC
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all the above
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单选题Which of the following may take place if the clearance of the main bearings are excessive?()A
bearing knocksB
dropping of pressure of LOC
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单选题If the head pressure of a reciprocating refrigeration compressor is excessive, ().A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
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单选题Excessive clearances in the main or crank-pin bearings will sometimes be indicated by () before any bearing knock is heard.A
loss of flow in the fuel systemB
loss of pressure in the air systemC
loss of flow in the lubricating systemD
loss of pressure in the lubricating system
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constantly decreasing as engine load increaseB
constantly increasing as the amount of supercharging increasesC
approximately equal to exhaust manifold pressure at all timesD
approximately equal to atmospheric pressure at all times
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The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increaseC
Exhaust gas pumping losses are increased due to turbine windageD
Exhaust gas back pressure falls slightly due to increased nozzle action
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单选题An un-loader is installed on an air compressor to ().A
bypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceB
prevent excessive inter-stage pressure buildupC
control compressor discharge pressureD
remove all but the frictional load during starting
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discharge is continuousB
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At zero load the intake manifold pressure is greater than the exhaust manifold pressureB
At full load the intake manifold pressure and exhaust manifold pressure are equalC
At full load the intake manifold pressure is less than the exhaust manifold pressureD
At full load the intake manifold pressure is greater than the exhaust manifold pressure
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单选题A swing check valve is used in a pipeline to ().A
maintain a preset pressure on the lineB
closely regulate the amount of flowC
relieve excessive pressure on the lineD
allow flow in one direction only
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单选题If the back clearance of a piston ring is excessive,()A
compression pressure in the cylinder will be higherB
carbon will accumulate behind the ringC
combustion gases will penetrate beneath the ring landD
piston side thrust will be increased
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单选题The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod () when the drive pressure is released.A
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retractionC
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