更多"The most effective method in removi"的相关试题:
[单项选择]When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.
A. slightly acidic
B. slightly alkaline
C. no salty
D. slightly bitter
[单项选择]The movement of water away from the shore or downstream is called a(n)（）.
A. reversing current
B. ebb current
C. flood current
D. slack current
[单项选择]Water fog from an all-purpose nozzle may be used to（）.
A. fight an electrical fire
B. fight a magnesium fire
C. eliminate smoke from a compartment
D. All of the above
[单项选择]The oil （） in the discharging water from oil water separator exceeds 15 PPM without alarm, because the coil was burnt out.
A. filter
B. hole
C. pollution
D. content
[单项选择]（） is the production of pure water from sea water by evaporation and re-condensing.
A. Evaporation
B. Circulation
C. Condensation
D. Distillation
[单项选择]We use （） to distill fresh water from sea water.
A. engine
B. sea water pump
C. cylinder cooler
D. fresh water generator
[单项选择]The primary method by which water spray puts out fires is by（）.
A. removing the oxygen
B. cooling the fire below the ignition temperature
C. removing combustible material
D. diluting combustible vapors
[单项选择]Distilled water from an evaporator may be discharged into a potable water tank （）.
A. through a detachable hose connection
B. after passing through an activated charcoal filter
C. after chemical analysis shows it is fit for consumption
D. through a solenoid operated three-way valve
[单项选择]The most accurate method of determining gyrocompass error while underway is by（）.
A. Comparing the gyro azimuth of a celestial body with the computed azimuth of the body
B. Comparing the gyro heading with the magnetic compass heading
C. Determining from the chart the course made good between celestial fixes
D. It cannot be determined accurately at sea due to drift of unknown currents
[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]The valve that prevents water from backing out of the boiler into the feed line is the（）.
A. bottom-blow valve
B. skin valve
C. feed-check valve
D. feed-stop valve
[单项选择]The most inefficient method of voltage reduction from the stand point of power loss, is a/an （）
A. capacitor in series with the load
B. inductor in series with the load
C. capacitor and inductor in series with the load
D. resistor in series with the load
[单项选择]An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.
A. propeller hub
B. lignum vitae
C. shaft packing
D. labyrinth seal
[单项选择]The separation of impurities and water from （） is essential for good combustion of diesel engines.
A. lube oil
B. fuel oil
C. turbine oil
D. grease
[单项选择]Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）
A. Crossing the spring lines
B. Slacking all forward running lines while keeping all after running lines taut
C. Doubling up on spring or breast lines
D. Slacking bow and stern lines
[单项选择]When a tornado moves over the water from land it is called a（）.
A. Tornado
B. Waterspout
C. Hurricane
D. Cyclone
[单项选择]The reciprocating pump can’t draw water from a tank may be caused by （）.
A. leaky pipe
B. opened inlet valve
C. too much water in tank
D. None of the above
[单项选择]To（）sanitary water from any vessel，an application shall be made to Harbor Authorities for approval.
A. discharge
B. recircle
C. load
D. take in
[单项选择]The most suitable pump for oily water separator feed duties is （）.
A. a reciprocating pump
B. a vane pump
C. a centrifugal pump
D. a triple screw pump
