更多"On the high seas，a fog signal consi"的相关试题:
[单项选择]A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.
A. vessel being towed
B. fishing vessel engaged in trawling
C. vessel at anchor warning of her location
D. power-driven pilot vessel on station underway
[单项选择]A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.
A. fishing
B. in distress
C. at anchor
D. not under command
[单项选择]A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.
A. A black ball in the forepart of her vessel
B. A black double frustum of a cone
C. A basket where best seen
D. A black cone point upwards
[单项选择]A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.
A. at anchor
B. towing a submerged object
C. being overtaken in a narrow channel
D. in distress
[单项选择]High-velocity fog（）.
A. is a finer，more diffuse water spray than low-velocity fog
B. requires that the water pressure be no greater than 60 psi
C. produces an effective fog pattern no more than 6 feet beyond the nozzle
D. extinguishes a fire by absorbing heat and reducing the supply of oxygen
[单项选择]A light signal consisting of three flashes means （）.
A. I am in doubt as to your actions
B. My engines are full speed astern
C. I desire to overtake you
D. I am operating astern propulsion
[单项选择]When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.
A. pressure builds up in the nozzle which causes a surge of water
B. the only opening in a passageway is the one from which the nozzle is being advanced
C. pressure in the fire hose drops below 100 psi
D. a bulkhead collapses due to heat and pressure
[单项选择]A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.
A. using a 2-1/2 inch hose
B. there is an outlet for the smoke and heat
C. the fire is totally contained by the ship's structure
D. at least two fog streams can be used
[单项选择]Approaching an anchorage in fog，you hear one short，one prolonged，and one short blast in that sequence on a ship’s whistle． This indicates（）.
A. A vessel towed
B. A vessel not under command and unable to maneuver
C. A vessel anchored giving warning of her position
D. A vessel stopped dead in the water
[单项选择]You are underway in fog and you hear one prolonged blast followed by two short blasts.This is a vessel（）.
A. Towing
B. Engaged on pilotage duty
C. Aground in a fairway
D. Stopped and making no way through the water
[单项选择]If your vessel is underway in fog and you hear one prolonged and three short blasts，this is a （）.
A. vessel not under command
B. sailing vessel
C. vessel being towed (manned)
D. vessel being towed (unmanned)
[单项选择]Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.
A. obscured
B. darkened
C. greyed
D. delighted
[单项选择]In very high latitudes，the most practical chart projection is the（）.
A. Mercator
B. Gnomonic
C. Azimuthal
D. Lambert conformal
[单项选择]Which kind of fog is also named as ground fog?（）
A. Advection
B. Radiation fog
C. frontal fog
D. Steam fog
[单项选择]One cause of high head pressure occurring in a refrigeration system can be （）.
A. insufficient cooling water flow to the condenser
B. a low refrigerant charge in the system
C. the liquid valve is open too much
D. high evaporator superheat
[单项选择]One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）
A. increase scavenge air pressure
B. reduce fuel booster pump pressure
C. adjust the fuel rack
D. retard fuel injector timing
[单项选择]A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.
A. can’t be controlled very precisely
B. can’t be controlled as flexibly as the separate pump system
C. can be controlled as flexibly as the separate pump system
D. can be controlled more precisely and flexibly
