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
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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
A.open loop control
B.feedback
C.combining control
D.integral process
A.0~05Mpa
B.0~95Mpa
C.1~05Mpa
D.0~5Mpa
A.a mooring winch
B.a hoisting winch
C.a slewing winch
D.a luffing winch
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