更多"The component of a refrigerating sy"的相关试题:
[单项选择]Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）
A. Expansion valve
B. Condenser
C. Evaporator
D. Compressor
[单项选择]The routing system which aimed at reducing the risk of casualties is called as（）.
A. traffic separation schemes
B. recommended tracks
C. precautionary areas
D. inshore traffic zones
[单项选择]AMVER is a system which provides（）.
A. satellite communications
B. navigational information
C. weather information
D. position reporting service
[单项选择]The Routing System which aimed at reducing the risk of casualties is called as（）.
A. Traffic Separation Schemes
B. Recommended tracks
C. Precautionary areas
D. Inshore traffic zones
[单项选择]Which one is not the component of a typical, marine pattern self-contained unit?（）
A. a centrifugal fan
B. a direct expansion cooler
C. a hermetic compressor
D. a centrifugal pump
[单项选择]Which component of VPN technology ensures that data can be read only by its intended recipient？（）
A. data integrity
B. encryption
C. key exchange
D. authentication
[单项选择]The primary task of the compressed air system is to deliver the starting air necessary for （）
A. starting the ME
B. starting the emergency electric alternator
C. driving the main turbine
D. driving the turbocharger
[单项选择]In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）
A. The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloaded
B. The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be opened
C. When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unload
D. The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
[单项选择]The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products，while simultaneously cooling the inert gas，is called the（）.
A. filter
B. cooler
C. scrubber
D. purifier
[单项选择]In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A. An open vent in the cooling system
B. A fouled sea chest
C. A restricted water passage in the engine
D. Air entrained in the cooling water
[单项选择]The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.
A. bridge control panel
B. disconnect links
C. governor relay box
D. main switchboard
[单项选择]Which system may be useful for messages，such as local storm warnings or a shore-to-ship distress alert，for which it is inappropriate to alert all ships in the satellite coverage area?（）
A. NAVTEX
B. EGC
C. AMVER
D. DSC
[单项选择]In a diesel engine lube oil system, which of the following parts should be lubricated first?（）
A. Camshaft beatings
B. Main bearings
C. Piston crowns
D. Cylinder walls
[单项选择]The refrigerating agent can （） at low temperature in the evaporator.
A. expand
B. evaporate
C. condense
D. distil
[单项选择]The certificate for the refrigerating plant will（）soonI’d like to extend its validation now.
A. update
B. finish
C. outdated
D. expire
[单项选择]Which fire detection system is actuated by sensing a heat rise in a compartment?（）
A. Manual fire detection system
B. Automatic fire detection system
C. Smoke detection system
D. Watchman's supervisory system
[单项选择]Concerning the incinerator’s operation, which of the following is not correct?（）
A. Scavenging time should be more 30 seconds before igniting
B. The temperature of sludge tank is 80~100℃
C. First igniting the incinerator with diesel oil, when the temperature of health is about 600℃, the sludge oil drawn in
D. The ash can be dumped into sea when the distance is more than 3 miles from land
[单项选择]In which of the listed refrigeration system components does superheating of the refrigerant take place?（）
A. Expansion valve
B. Evaporator
C. Drier
D. Receiver
