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单选题
The over-speed trip device installed in some diesel engines is automatically actuated by（）
A
spring force
B
hydraulic pressure
C
centrifugal force
D
mechanical linkage
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单选题Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?（）A
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单选题While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）A
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考题
单选题An over-speed trip serves to （）A
stop the engine by cutting off the cooling water supplyB
stop the engine by closing the air intakeC
slow the engine but not stop itD
slow the engine to half of normal load
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单选题An over-speed trip stops a diesel engine when the engine （）A
runs out of fuelB
has low lubricating oil pressureC
exceeds a set maximum speedD
has high cooling water temperature
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单选题For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）A
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单选题The over-speed trip installed on most diesel engine will stop the engine by shutting off the （）A
water supplyB
fuel oil supplyC
lube oil supplyD
exhaust damper
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单选题The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）A
sliding the camshaft along its axisB
rotating the cam 180C
rotating the cam followers 180D
moving the idler sprockets in the drive chain
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Diesel engines have more advantages in comparison with gasoline enginesB
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Gasoline engines have more advantages in comparison with diesel enginesD
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keeps constant at all engine speed, independent of the engine speedD
is decided by the engine speed, constant at all engine speed
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单选题Some diesel engines are supercharged with a （）A
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fuel atomizerD
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单选题Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）A
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考题
单选题An electric heater built into some smaller diesel engines is used to （）.A
raise lube oil viscosity for easier starting in cold weatherB
increase air inlet temperatureC
increase compression ratioD
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单选题The overspeeding of the diesel engine driving an electric generator could cause （）.A
low voltage trip to tripB
reverse power trip to tripC
damage to windingsD
excessive exhaust temperatures
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单选题Valve cages are used on some large diesel engines to （）A
reduce wear on the valve stemB
permit the use of alloy valve seat materialsC
reduce heat transfer from the valve seatD
facilitate valve removal for servicing
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单选题All diesel engines are classified as（）.A
four cycleB
compression ignitionC
vacuum ignitionD
external combustion
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单选题A waste heat boiler is installed on some diesel propelled vessels to （）.A
provide steam for emergency propulsionB
provide steam for the turbo-generatorC
heat the waste water tanksD
steam for warming engines
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单选题Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）A
increase blow-by in all cylindersB
incomplete combustion in all cylinderC
overloading in all cylindersD
insufficient fuel delivery to all cylinders
考题
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
BedplateB
BlockC
BaseD
Sump
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