更多"When a high pressure system is cent"的相关试题:
[单项选择]The boat was sailing to the north when a terrible strom（）.
A. was breaking
B. broke out
C. would break out
[单项选择]In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）
A. When the helm is at any angle other than amidships
B. When the six-way valve is opened
C. When the ram relief valves lift
D. When the redder angle is different from the position of the helm
[单项选择]In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
A. raw water pump discharge
B. expansion tank outlet
C. cooling water heat exchanger
D. outlet engine jacket water outlet
[单项选择]A major advantage of the NAVTEX system when compared to other systems is that（）.
A. the information can be received on an ordinary FM radio
B. warnings are printed out for reading when convenient
C. broadcasts are at scheduled times
D. a low frequency band is used for long distance transmission
[单项选择]When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
A. a straight line drawn on the chart approximates a great circle
B. the chart should not be used outside of the standard parallels
C. the course angle is measured at the mid-longitude of the track line
D. distance cannot be measured directly from the chart
[单项选择]When considering the lowest fuel system operating temperature, （） are important.
A. specific gravity or relative density
B. open flash point and closed flash point values
C. higher calorific and lower calorific values
D. cloud point and pour point values
[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]When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）
A. CO2
B. Methyl chloride
C. R-22
D. Sulphur dioxide
[单项选择]When a hurricane passes into high latitudes over colder water and the source of heat is disrupted，the storm assumes the characteristics of（）.
A. a high pressure area
B. an extratropical cyclone
C. a tropical storm
D. an easterly wave
[单项选择]When working on a high voltage circuit, you should always have another person present with you.This person should have a good working knowledge of （）
A. the circuit being worked on and the location of all switches and circuit breakers controlling it
B. first-aid techniques for treating electrical shock
C. cardiopulmonary resuscitation (CPR)
D. All of the above
[单项选择]When using the term limber system one is referring to a（）.
A. Cleaning system
B. Drainage system
C. Strengthening system
D. Weight reduction system
[单项选择]When operating the air supply system in a covered lifeboat the（）.
A. fuel supply valve should be closed
B. hatches，doors，and oar ports should be closed
C. air cylinder shut-off valve should be closed
D. engine should be shut off
[单项选择]When the ship security alert system is activated, it shall not（）
A. initiate a ship-to-shore security alert
B. transmit a ship-to-shore security alert
C. initiate an alert identifying the ship, its location
D. raise a security alarm on-board the ship indicating that the ship is under threat
[单项选择]When may the automatic identification system (AIS) be switched off? （）
A. At anytime as long as it is properly logged
B. At the Master's professional judgment
C. Only when the vessel is at anchor or in port
D. Under no circumstance
[单项选择]When adding oil to a refrigeration system, precautions must be taken to ensure that （）.
A. the compressor suction pressure is not too high
B. all air is purged from the pump and charging fittings
C. the high pressure cutout switch is held open to prevent accidental starting
D. the condenser is completely shutdown first
[单项选择]As a high pressure system approaches，the barometer reading（）.
A. stays the same
B. falls
C. rises
D. falls rapidly
[单项选择]When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
A. the meridian through the object of the bearing
B. the meridian through the ship's position
C. the meridian midway between the ship and the object
D. any meridian
[单项选择]When the relief valve opens it discharges high pressure refrigerant vapor to the （）.
A. liquid strainer
B. refrigerant inlet of the condenser
C. inlet side of the evaporator
D. suction side of the compressor
[单项选择]The high pressure in fuel injection system of the diesel engine is produced by the （）.
A. injector pump
B. fuel injector
C. governor
D. turbocharger
