更多"Convection is the principal means （"的相关试题:
[单项选择]The principal advantage of NAVTEX radio warnings is that（）.
A. they can be used by mariners who do not know Morse code
B. only an ordinary FM radio is necessary to receive these warnings
C. information on a given topic is only broadcast at specified times
D. they cover a broad spectrum of the radio band allowing reception on almost any type of receiver
[单项选择]Increasing the temperature of a fuel will reduce its （）.
A. viscosity
B. pressure
C. resistance
D. setting point
[单项选择]I HAVE DANGEROUS LIST means（）.
A. I have some dangerous cargo on board
B. My cargo is dangerous
C. My vessel is inclined
D. My vessel has not been trimmed properly
[单项选择]I am making water means（）.
A. my vessel is leaking
B. my vessel is producing fresh water
C. my vessel is producing sea water
D. sea water is de-salted on board my vessel
[单项选择]I AM MAKING WATER means（）.
A. My vessel is leaking
B. My vessel is producing fresh water
C. My vessel is producing sea water
D. Sea water is de-salted on board my vessel
[单项选择]As its temperature rises, the volume of fuel oil in the tanks will （）.
A. remain the same
B. increase
C. decrease
D. none of the above
[单项选择]Convection spreads a fire by（）.
A. heated gases flowing through ventilation systems
B. the transfer of heat across an unobstructed space
C. burning liquids flowing into another space
D. transmitting the heat of a fire through the ship's metal
[单项选择]To prevent the spread of fire by convection you should （）.
A. remove combustibiles from direct exposure
B. cool the bulkhead around the fire
C. close all openings to the area
D. shut off electrical power
[单项选择]Convection spreads a fire as a result of （）.
A. transmitting the heat of a fire through the ships metal
B. burning liquids flowing into another space
C. heated gases flowing through ventilation systems
D. the transfer of heat across an unobstructed space
[单项选择]The principal purpose of magnetic compass adjustment is to（）.
A. reduce the variation as much as possible
B. reduce the deviation as much as possible
C. reduce the magnetic dip as much as possible
D. allow the compass bowl to swing freely on its gimbals
[单项选择]The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A. direction of air flow within the cylinder
B. sequence of port opening
C. method of opening exhaust ports
D. volume of air admitted to the cylinder
[单项选择]The (auto)ignition temperature is that temperature atwhich（）.
A. no spark or flame is required to ignite gas or vapor
B. a fuel begins to give off explosive vapors
C. a fuel if ignited will continue to burn
D. a 1% mixture of the fuel with air will explode
[单项选择]The principal personnel hazard unique to Halon extinguishers is（）.
A. displacement of oxygen
B. skin irritation
C. inhaling toxic vapors
D. eye irritation
[单项选择]One of the principal dangers inherent in liquefied petroleum gas is（）.
A. as it warms up it becomes heavier than air
B. the way it reacts with sea water
C. the strong odor it produces
D. its low temperature causes frostbite or freezing
[单项选择]The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A. variation
B. compass error
C. deviation
D. earth's magnetic force
[单项选择]VIT means （）
A. variable injection timing
B. variable inlet tonnage
C. vertical incoming tonnage
D. vertical inlet tank
