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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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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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What best describes for how long a gas-free test is good ________.A.For as long as is indicated on the gas-free certificateB.For the instant that it is madeC.Until valves in line with the tank or compartment are reopenedD.Until changes in temperature or pressure affect the vapor content in the space
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You are on a tanker designed to carry molten sulfur.Which statement is TRUE ________.A.There must be two portable toxic vapor detectors on boardB.The cargo tank ventilation system must maintain the H2S vapor concentration at 1.85% or more by volumeC.Cargo temperature may be taken by portable thermometersD.The pressure in the heating coils in the tanks must be less than that of the cargo exerted on them
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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
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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
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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
solid stateC
liquefied stateD
inert state
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单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced()A
lower condensingB
higher coolingC
lower coolingD
higher condensing
考题
单选题A heated bulkhead has the effect on a hygroscopic commodity of().A
causing moisture to accumulate against the bulkheadB
lowering the vapor pressure of the commodityC
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liquid strainerB
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atmospheric pressure is 14.7 lbs. per square inchC
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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
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单选题A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the().A
high pressure liquid lineB
low pressure liquid lineC
high pressure vapor lineD
low pressure vapor line
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
superheated vapor
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Gravity siphon effectB
Higher vacuum in the second-stageC
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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
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Brine
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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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