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单选题
Reid vapor pressure is（）.
A
exerted by liquid cargo on the sides of a tank
B
exerted by liquid cargo on a cargo hose body
C
the lowest temperature and pressure that will cause a flammable liquid to give off vapors
D
a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
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The vapor pressure of a gas is the pressure necessary to keep it in a（n）______．A.Soluble stateB.Solid stateC.Liquefied stateD.Inert state
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Reid vapor pressure is ______．A.exerted by liquid cargo on the sides of a tankB.exerted by liquid cargo on a cargo hose bodyC.the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD.a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
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考题
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
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考题
单选题Reid vapor pressure is（）.A
exerted by liquid cargo on the sides of a tankB
exerted by liquid cargo on a cargo hose bodyC
the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD
a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
考题
单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）A
De-energizes the charged mist effectB
Maintains a positive pressure on the vent header to cool the flammable vaporsC
Inert gas filters out the flammable vapors from the cargo tank spacesD
Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
考题
单选题The designations A，B，C，D and E grades of cargo refer to the（）.A
degrees of quality of petroleum productsB
flash point range and Reid vapor pressure index of petroleum productsC
grades of crude oilD
pour point，color，and viscosity index of petroleum products
考题
单选题The flash-evaporator is different with the submerged-tube evaporator in that for the former（）A
Water is heated into vapor on heating surfacesB
Water is vaporized by pressure differenceC
There are no heating-transfer surfacesD
There are more heating-transfer surfaces
考题
单选题The vapor pressure of a substance（）.A
decreases as temperature increasesB
increases with the temperatureC
is not affected by temperatureD
may increase or decrease as the temperature rises
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soluble stateB
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higher coolingC
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考题
单选题A heated bulkhead has the effect on a hygroscopic commodity of（）.A
causing moisture to accumulate against the bulkheadB
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lowering the dew point of the airD
raising the vapor pressure of the commodity
考题
单选题When the relief valve opens it discharges high pressure refrigerant vapor to the （）.A
liquid strainerB
refrigerant inlet of the condenserC
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考题
单选题The dew point is reached when the（）.A
temperature of the air equals the temperature of the seawaterB
atmospheric pressure is 14.7 lbs. per square inchC
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air becomes saturated with water vapor
考题
单选题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
考题
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high pressure liquid lineB
low pressure liquid lineC
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考题
单选题The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.A
sub-cooled liquidB
high temperature liquidC
oil saturated liquidD
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考题
单选题Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）A
Gravity siphon effectB
Higher vacuum in the second-stageC
Difference in brine density between first and second stagesD
lower pressure in first-stage
考题
单选题What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）A
RefrigeratorB
RefrigerantC
Cooling mediumD
Brine
考题
单选题Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）A
Ball floatB
ThermostaticC
BimetallicD
Impulse
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