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单选题
Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）
A
higher speed required
B
flywheel-effect
C
lower starting temperatures
D
higher compression pressures
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Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to _____________.A.higher speed requiredB.flywheel-effectC.lower starting temperaturesD.higher compression pressures
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compressed airB
electricityC
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单选题Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.A
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glow plugsC
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单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.A
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单选题Diesel engine cylinder head test cocks are used to（）A
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单选题In a diesel engine, blow-by is generally the result of worn（）A
valve guidesB
oil control ringsC
valve seatsD
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单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）A
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考题
单选题The is employed to warm up a large diesel engine before its starting（）A
hot airB
hot boiler waterC
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单选题Cold weather starting of a diesel engine may be made easier by（）A
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using a special fuel having a high ignition temperatureC
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heating the jacket water
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单选题A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）A
line up the engine fore restarting with light diesel oilB
reposition the fuel injection camC
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单选题Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to （）A
test the starting systemB
remove condensation from the cylindersC
check the compressionD
check for proper lube oil pressure
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单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
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operates without energy absorbing intake and exhaust strokes
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Electric startingC
IgnitionD
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单选题An electric heater built into some smaller diesel engines is used to （）.A
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increase air inlet temperatureC
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考题
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单选题Overspeed of the diesel engine driving an electric generator could cause（）.A
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单选题Universal motors will operate on AC or DC current, and are generally found in （）A
portable toolsB
large pump motorsC
turbo electric main motorsD
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考题
单选题When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）A
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water accumulation in some engine cylindersC
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考题
单选题The most common forms of main drive used on deck auxiliaries are （）.A
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diesel engine, hydraulic machinery and compressed airC
steam plants, electric motors and hydraulic machineryD
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考题
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）A
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continuous operation of the starting air compressorC
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考题
单选题The highest pressure in a diesel engine cylinder normally occurs （）.A
at TDCB
before TDCC
after TDCD
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A, B and C
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one-half engine speedB
the same as engine speedC
twice engine speedD
four times engine speed
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