更多"It is necessary to remove （） from t"的相关试题:
[单项选择]It is necessary to remove （） from the cooling spaces.
A. scar
B. scale
C. spur
D. bilge
[单项选择]When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.
A. strength
B. dense
C. percentage
D. velocity
[单项选择]Head tank should be used to remove （） from cooling water.
A. scale
B. sludge
C. chemicals
D. air
[单项选择]Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）
A. discharge side of the centrifugal pump
B. suction side of the centrifugal pump
C. the lowest point of the cooling water system
D. inlet of the main engine
[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]In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.
A. positive head
B. negative suction head
C. mechanical seal
D. vent valve attached to the casing at the top of the volute
[单项选择]Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）
A. coastal breeze
B. sea breeze
C. land breeze
D. mistral
[单项选择]Expansion tank should be used to remove （） from cooling water.
A. scale
B. sludge
C. chemicals
D. air
[单项选择]In order to remove the carbon deposit from the threaded recess, we can use（）
A. a driver
B. a scraper
C. a tap
D. a file
[单项选择]Purging air from a hydraulic system is necessary when（）
A. adding small amounts of oil to the system
B. the system has been overheated
C. the system has been drained and then filled with new oil
D. the system has been idle for a long period of time
[单项选择]Bottom blow valves are installed on auxiliary water-tube boilers to （）
A. completely drain the boiler in an emergency
B. prevent sludge from forming in the drum
C. remove floating impurities from the boiler water surface
D. remove settled solids from the water drum
[单项选择]What are the most important reasons for using water fog to fight fires?（）
A. Smothers burning surfaces，organically destroys fuel
B. Cools fire and adjacent surfaces，provides protective barrier
C. Reaches areas not protected by steam or CO2 smothering systems
D. Allows fire to be attacked from leeward，saturates liquid surfaces
[单项选择]The position of the interface between oil and water within the centrifuge is achieved by the use of （）.
A. gravity disc
B. centrifugal bowl
C. a stack of discs
D. main sealing ring
[单项选择]Your vessel has been damaged and is taking on water，but you do not require immediate assistance. You would preface a message advising other vessels of your situation with（）.
A. Mayday-Mayday-Mayday
B. Pan-Pan (3 times)
C. Securite-Securite-Securite
D. SOS-SOS-SOS
[单项选择]Heights are expressed（）meters above mean high water.
A. in
B. on
C. by
D. with
[单项选择]
If a small electric motor is immersed in salt water it should be （）
(1) washed in fresh water
(2) dried in an oven
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) or (2)
[单项选择]On no account （）proceed without pilot in this water area．
A. the vessel
B. shall not vessel
C. the vessel should
D. should vessel
[单项选择]While loading bulk oil, you notice oil on the water near the bargeWhich of the following actions should you carry out FIRST?（）
A. Search the vessel for leaks
B. Notify terminal superintendent
C. Stop loading
D. Notify the Coast Guard
