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单选题
Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?（）
A
Steel brush
B
Fine emery cloth or steel wool
C
A section of the removed compression ring
D
A case hardened scraper
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考题
单选题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）A
top of the ring grooveB
back of the ring grooveC
bottom of the ring grooveD
piston ring end clearance
考题
单选题A diesel engine piston ring face is in direct contact with the （）.A
top of the ring grooveB
cylinder liner oil filmC
bottom of the ring grooveD
back of the ring groove
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单选题All of the following commands could be used to verify availability of tty devices on the system EXCEPT：（）。A
lsttyB
lsconsC
lsdevD
lscfg
考题
单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）A
Control the amount of lube oil burned in the combustion chamberB
Transmit heat from the piston to the cylinder linerC
Prevent damage to ring groove inserts by acting as a heat damD
Dissipate combustion chamber gas pressure by channeling it through the ring gap
考题
单选题Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）A
TransducerB
ReducerC
TransformerD
Rectifier
考题
单选题Which of the listed devices could be used as a substitute for a ring grooving tool?（）A
Steel brushB
Fine emery cloth or steel woolC
A section of the removed compression ringD
A case hardened scraper
考题
单选题In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）A
Used of bimetallic piston ringsB
Ring gap pre-tensioningC
Thermal increase in ring-end clearanceD
Gas pressure acting against the back of the ring
考题
单选题Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）A
CopperB
Copper and carbonC
CarbonD
Bronze
考题
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AtomizationB
MeteringC
Effective strokeD
Penetration
考题
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The follow-up gearB
The rudder angle indicatorC
The synchronous electric transmitterD
A rudder angle limit switch
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单选题Which of the motors for the devices listed below is fitted with an instantaneous overload relay?（）A
FanB
PumpC
WinchD
Machine tool
考题
单选题If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）A
corrosive deterioration of a bearingB
inadequate air filtrationC
excessive ring and liner wearD
excessive cooling of lubricating oil
考题
单选题Which of the devices listed is common to all types of pumps?（）A
A power end and fluid endB
A propeller and educatorC
A volute and impellerD
A turbine and piston
考题
单选题If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）A
excessive ring actionB
excessive ring temperatureC
improper ring rotationD
excessive ring face wear
考题
单选题The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.A
upwards；inwardsB
upwards；outwardsC
downwards；inwardsD
downwards；outwards
考题
单选题Ring groove inserts are occasionally used on aluminum alloy piston to（）A
reduce the ring groove wear rateB
seal against crankcase vaporsC
lessen the wear on aluminum part of the cylinderD
allow for the greater expansion rate of aluminum
考题
单选题Which of the listed devices would be installed at a control system air pressure reducing station?（）A
Moisture separatorB
Vacuum breakerC
LubricatorD
Non-return valve
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