A.pressure does not fluctuate rapidly
B.pressure remains steady and unchanged
C.brine density does not exceed 1~5
D.brine density is too low
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A.moisture emulsification of the bearing grease
B.insufficient circulation and overheating of the bearing
C.proper grease circulation to cool the bearing
D.sliding friction between balls and races
A.oil fires in the engine room bilges
B.class B fires in paint lockers
C.any class D fire
D.all of the above
A.natural circulation of the water in the water tube boiler is better than that in the fire tube boiler
B.for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler
C.the water tube boiler will cost shorter time for steam raising
D.the water tube boiler require lower skill in operating and maintaining
A.the direct acting relief valve is used for controlling lower flows and pressure
B.the pilot operated relief valve is used for controlling higher flows and pressure
C.the pilot operated relief valve is used for controlling lower flows and pressure
D.the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
A.electric motor
B.hydraulic motor
C.compressed air
D.turning gear
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
A.the temperature and flow quantity of the exhaust gas from M/E
B.the quantity of steam demanded
C.the rotary speed and the cooling water temperature of main engine
D.efficiency of M/ turbocharger
A.M/E turbocharger
B.exhaust gas boiler
C.incinerator
D.fresh water generator
A.the former
B.the latter
C.not for sure
D.same each other
A.0°F
B.18°F
C.32°F
D.50°F
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