更多"In order to prevent galvanic corros"的相关试题:
[单项选择]In order to prevent a person（）general average contribution on the ground that he was at fault，the fault must be something which constitutes an actionable wrong.
A. to recover
B. to be recovered
C. being recovered
D. recovering
[单项选择]Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
A. sulfite or hydrazine
B. sulfite or hygroscopic sulfite
C. bromide or hydrazine
D. bromide or hygroscopic sulfite
[单项选择]Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.
A. vanadium
B. carbon
C. copper
D. ash
[单项选择]To lubricate the swivel or remove corrosion from a fire hose coupling，you should use（）.
A. glycerine
B. graphite
C. kerosene
D. fresh water and soap
[单项选择]Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）
A. maintain low pH in the cooling water
B. reduce the cooling water temperature
C. increase cooling water hardness
D. form a protective film on metal surfaces
[单项选择]"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.
A. east iron is a cheap material
B. cast iron can pollute sea water
C. cast iron has mere corrosive than bronzes to sea water
D. cast iron is more corrosive to sea water when it meets with bronzes
[单项选择]To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of （）.
A. brass
B. copper
C. iron
D. monel metal or stainless steel
[单项选择]With （）, the corrosion problems are much reduced in a central cooling system.
A. no equipment in contact with sea water
B. less equipment in contact with fresh water
C. more equipment in contact with sea water
D. less equipment in contact with sea water
[单项选择]Corrosion and grooving on the blade of an exhaust driven turbocharger is caused by certain components of residual fuel oilsThese components are vanadium,sodium, and（）
A. copper
B. carbon
C. hydrogen
D. sulfur
[单项选择]Aluminum lifeboats are subject to damage by electrolytic corrosion (the aluminum being eaten away). In working around boats of aluminum you must be very careful（）.
A. to keep the boats covered at all times
B. not to leave steel or iron tools lying in or near these boats
C. to keep an electric charge on the hull at all times
D. to rinse these boats regularly with salt water
[单项选择]Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.
A. increase in resistance with increased temperature
B. increase in resistance with decreased temperature
C. decrease in resistance with increased temperature
D. increase in conductance with increased temperature
[单项选择]Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）
A. twice as large as with a cast iron piston
B. the same size as with a cast iron piston
C. half as large as with a cast iron piston
D. the same size as the crown of an aluminum piston
[单项选择]Aluminum pistons have （） coefficient of thermal expansion compared with those of cast iron.
A. higher
B. lower
C. the same
D. none of the above
[单项选择]According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.
A. pressure vacuum relief valves
B. excess flow valves
C. safety relief valves
D. flame screens
[单项选择]The ability of the governor to prevent fluctuations in engine speed is termed （）.
A. sensitivity
B. stability
C. promptness
D. speed droop
[单项选择]To prevent accidents from occurring, special valve chests are used in such cases in which interchangeable blanks and connecting passages are incorporatedThe bold and italic word “which” means （）.
A. accidents
B. special valve chests
C. interchangeable blanks
D. connecting passages
[单项选择]Fire dampers prevent the fire spreading through the process of （）.
A. convection
B. conduction
C. radiation
D. direct contact
[单项选择]To prevent loss of stability from free communication flooding you should（）.
A. close the cross-connection valve between the off-center tanks
B. completely flood high center tanks
C. ballast double bottom wing tanks
D. close any opening to the sea in an off-center tank
[单项选择]Which set of commands is recommended to prevent the use of a hub in the access layer?（）
A. switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security maximum 1
B. switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security mac-address 1
C. switch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1
D. switch(config-if)#switchport mode access switch(config-if)#switchport port-security mac-address 1
