A.the expansion valve will move toward the wide open position
B.the expansion valve will move toward the closing position
C.the feeler bulb will conveys the high temperature
D.the superheat degree will raise
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A.move in an opening direction
B.move in a closing direction
C.either open or close
D.not move at all
A.help preheat the air for the furnaces
B.help preheat the feedwater
C.protect economizer from excessive heat
D.prevent excessive furnace heat losses
A.the bilges
B.the periscope
C.the water level
D.the oil pressure
A.excess stresses will not be set up in the boiler
B.the decks will not be covered with soot
C.the soot will be swept toward the uptakes
D.there will not be a loss of steam pressure
A.bottom-blow valve
B.skin valve
C.feed-check valve
D.feed-stop valve
最新試題
Under MARPOL Code the ship to which it applies has to carry （）
Which of the following items don’t belong to dock repair works?（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
If separating effect is not good, which measure should be taken （）
（） is not installed on the main switchboar.
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
Cold weather starting of a diesel engine may be made easier by（）
The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.