更多"Bottom blow valves are installed on"的相关试题:
[单项选择]Bottom blow valves are installed on auxiliary water-tube boilers to （）
A. remove suspended and precipitated solids from the boiler water
B. completely drain the boiler in an emergency situation
C. prevent hardened scale deposits in the water drum
D. remove floating impurities from the oily water surface
[单项选择]The donkey boiler may be given a bottom blow （）
A. to raise water level
B. only while making steam
C. to remove scum
D. when fire are secured
[单项选择]Blow-off of the relief valves of the main cylinders during operation indicates （）.
A. the cylinder cover is cracked
B. the injector holes is clogged
C. the cams are not properly set
D. fuel pump is leaking
[单项选择]Blow-off of the relief valves of the engines cylinders may be caused by （）.
A. too low lead
B. water in fuel
C. too tight spring
D. leakage
[单项选择]The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section is called a（）.
A. crossover
B. runaround
C. come-along
D. manifold
[单项选择]In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.
A. the beveled edges of the intake valves provide for serf-centering during seating
B. intake valves utilize stellite-coated valve seat inserts which reduce wear
C. the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D. intake valves are less affected to the corrosive action of exhaust gases
[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]It is necessary to remove （） from the cooling water spaces to improve heat transfer.
A. lime
B. frost
C. scale
D. scar
[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
[单项选择]We（）a sharp lookout while sailing in the iced waters.
A. keep
B. kept
C. are keeping
D. have kept
[单项选择]If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.
A. temperature
B. viscosity
C. lever
D. level
[单项选择]The engine has broken and the boat is（）on the water.
A. flowing
B. floating
C. drifting
D. sailing
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
