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单选题
In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）
A
avoid false alarms as a result of condensing water vapor
B
avoid danger of frost under very cold weather
C
reduce the viscosity of the crankcase atmosphere in order to improve the fluidity
D
keep the temperature of the oil mist detectors in an appropriate range
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更多 “单选题In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）A avoid false alarms as a result of condensing water vaporB avoid danger of frost under very cold weatherC reduce the viscosity of the crankcase atmosphere in order to improve the fluidityD keep the temperature of the oil mist detectors in an appropriate range” 相关考题
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单选题The desirable properties of a marine fuel oil should include（）A
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low flash point and high viscosityC
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an oil lanternC
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单选题In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.A
supply clean air to the measuring compartment of the units for more accuracyB
generaate the pressure required for the extraction of the oil mist from theC
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考题
单选题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.A
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考题
单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A
free entry of air to the crankcaseB
water entering the crankcase while engine wash-downs are being performedC
excessive oil leakage during periods of increased blow-byD
sub-cooling internal components
考题
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the engine crankcaseB
the engine scavenge boxesC
drain tanksD
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考题
单选题The purpose of an oil mist detector in a main propulsion diesel engine is to warn of （）A
excessive mist density in the crankcasesB
excessively high crankcase vacuumC
excessively high bearing temperatureD
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考题
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考题
单选题The oil mist detectors continuously（） the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.A
detractB
extractC
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考题
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oilB
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考题
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考题
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考题
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The smoke detectorsC
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考题
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cetane numberB
pour pointC
viscosity temperatureD
quality of the oil
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