Combustible gas indicators operate by drawing an air sample into the instrument ______．A.Over an electrically heated platinum filamentB.Where it is mixed with nitrogenC.Where it is ignited by a sparking deviceD.Where its specific gravity is measured
Combustible gas indicators operate by drawing an air sample into the instrument ______．
A.Over an electrically heated platinum filament
B.Where it is mixed with nitrogen
C.Where it is ignited by a sparking device
D.Where its specific gravity is measured
相关考题：
An inert gas system on a tanker should be used to ______.A.prevent the generation of flammable or combustible gas in tanksB.blow out cargo lines to prevent the build up of gas concentrationsC.dilute tank atmospheres to keep gas concentrations below the lower explosive limitD.prevent fires in the pumproom by continually displacing flammable vapors
What is the best instrument for establishing a safe working area before welding in a confined space?A.An oxygen indicatorB.A combustible gas indicatorC.A combination combustible gas and oxygen indicatorD.A flame safety lamp
What is used to test a tank for oxygen content ________．A.Combustible gas indicatorB.Vapor indicatorC.Atmosphere analyzer kitD.None of the above
You are testing a tank that contained gasoline by using a combustible gas indicator．Under testing，the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero．What is the concentration of flammable gas ________．A.Less than the flammable rangeB.Within the flammable rangeC.Over the flammable rangeD.The explosimeter is defective and giving a false reading
The fresh air intake of the inert gas system ______，A.Prevents the flue gas from falling below 3% content of oxygenB.Allows the inert gas piping to be used for gas freeing the tanksC.Opens when there is excessive vacuum on the deck water sealD.Enables outside air to mix with and cool hot flue gasses
Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks ________．A.A flame safety lampB.A combustible gas indicatorC.A liquid cargo meterD.All of the above
Which statement is TRUE concerning combustible gas indicators ________．A.One sample of air is adequate to test a tankB.They do not work properly where there is a lack of oxygenC.They will detect a lack of oxygenD.They are calibrated to read the percentage chance of explosion
A microbarograph is a precision instrument that provides a ______．A.charted record of atmospheric temperature over timeB.charted record of atmospheric pressure over timeC.graphic record of combustible gases measured in an atmosphereD.graphic record of vapor pressure from a flammable/combustible liquid
Combustible gas indicators measure the presence of combustible gas as a percentage of the____.A.flash pointB.upper explosive limitC.lower explosive limitD.fire point
Deficient oxygen content inside a chain locker can be detected with ______.A.litmus paperB.a combustible gas indicatorC.an oxygen breathing apparatusD.an oxygen indicator
单选题The fresh air intake of the inert gas system（）.Aprevents the flue gas from falling below 3% content of oxygenBallows the inert gas piping to be used for gas freeing the tanksCopens when there is excessive vacuum on the deck water sealDenables outside air to mix with and cool hot flue gasses
单选题A combustible gas indicator is used to determine （）.Aif there is sufficient oxygen to support lifeBthe toxicity of flammable gases or vaporsCthe amount ofCO2 present in flue gasDthe presence of flammable gases or vapors in the air
单选题A microbarograph is a precision instrument that provides a（）.Acharted record of atmospheric temperature over timeBcharted record of atmospheric pressure over timeCgraphic record of combustible gases measured in an atmosphereDgraphic record of vapor pressure from a flammable/combustible liquid
单选题A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases? （）AIn the lower level of the pumproomBIn the middle level of the pumproomCIn the upper level of the pumproomDOn the deck outside the pumproom
单选题A pyrometer is an instrument commonly used to measure（）Acylinder pressureBflame intensityCexhaust gas temperatureDcrankshaft axial alignment
单选题Deficient oxygen content inside a chain locker can be detected with（）.Alitmus paperBa combustible gas indicatorCan oxygen breathing apparatusDan oxygen indicator
单选题Which instrument is used to measure the relative humidity of air?（）AHydrometerBHygrometerCSpectrometerDBarometer
单选题The emergency source of power for Mobile Offshore Drilling Units should be capable， having regard to starting currents and the transitory nature of certain loads， of supplying simultaneously at least the services specified in 5.3.6 of the 1989 MODU Code. Which one of the following service is not required to be supplied from the emergency power for a period of 18 hours？（）AEmergency lighting at every embarkation station on deck and over sidesBEmergency lighting at the storage positions for firemen’s outfitsCFire and gas detection and their alarm systemDPower to operate the watertight doors and their indicators
单选题The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called （）.Aabsolute humidityBspecific humidityCeffective humidityDrelative humidity
单选题A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.ApurifiesBcombinationsCconcentrationsDfilters
单选题Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.Aflash pointBupper explosive limitClower explosive limitDfire point
单选题Combustible gas indicators operate by drawing an air sample into the instrument（）.Aover an electrically heated platinum filamentBwhere it is mixed with nitrogenCwhere it is ignited by a sparking deviceDwhere its specific gravity is measured
单选题A diesel engine crankcase ventilation system （）Aprevents spark generationBremoves combustible gasesCdetermines the level of combustible gasesDprovides inert gas generation in crankcase
单选题Before entering a tank，always check the vapor content（）a combustible gas indicator.AwithBbyCofDfor
单选题When monitoring diesel engine performance, the most useful instrument to use is the （）Adwell-tachometerBexhaust gas pyrometerCfuel flow rate meteDexhaust gas analyzer
单选题An inert gas system on a tanker should be used to（）.Aprevent the generation of flammable or combustible gas in tanksBblow out cargo lines to prevent the build up of gas concentrationsCdilute tank atmospheres to keep gas concentrations below the lower explosive limitDprevent fires in the pumproom by continually displacing flammable vapors
单选题An inert gas system on a tanker should be used to（）.Aprevent the generation of flammable or combustible gas in tanksBblow out cargo lines to prevent gas concentrationsCdilute tank atmospheres to keep gas concentrations below the lower explosive limitDprevent fires in the pumproom by continually displacing flammable vapors