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发布时间:2023-10-11 14:27:40

[单项选择]The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the().
A. air gap
B. freeboard
C. penetration
D. water depth

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[单项选择]The water level showing in a boiler water gauge glass is usually () during working.
A. higher than the actual drum water level
B. equal to the actual drum water level
C. increasing due to steam condensation in the glass
D. lower than actual drum water level
[单项选择]Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “()” danger.
A. carry off
B. carry down
C. carry on
D. carry over
[单项选择]The water level in a steaming auxiliary boiler will always ()
A. rise when the steam pressure is increased
B. remain constant as long as the feed pump operates
C. fall when the steam pressure is decreased
D. vary as the steam demand changes
[单项选择]If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a ()
A. loss of suction in the circulating pump
B. leak in the primary cooling system
C. broken raw water pump shaft
D. burned or cracked piston in one cylinder
[单项选择]During the diesel engine running, the water level of FW expansion tank should normally kept in the () level of glass tube.
A. the highest
B. above 3/4
C. 1/2-3/4
D. the lowest
[单项选择]The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it ()
A. will be modulated in proportion
B. will be modulated in proportion and integral
C. will be modulated in proportion and differential
D. will not be modulated at all
[单项选择]()on still water indictes how loading weight distribution affects on longitudinal strength.
A. Bending moment
B. local strength
C. shear force
D. displacement
[单项选择]The water level in the gauge glass when a boiler is operating is () when the boiler is shut down.
A. lower than
B. higher than
C. below
D. equal to
[单项选择]When a boiler is operating, the water level in the gauge glass reads () when the boiler is shut down.
A. lower than
B. higher than
C. as much as
D. the same as
[单项选择]If in doubt as to the true water level when a boiler is being oil-fired, you should ().
A. take no measures
B. extinguish the fire as soon as possible
C. feed water to the boiler
D. open the blow down valve
[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]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

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