海船船员 - 三管轮

单选题

When bilge water is heated in a holding tank, which one of the following statements is not

A. The high temperature facilitates primary gravity separation
B. Most of the oil and organic solvents are raised to the top layer
C. The high the temperature is, the more the top oil will be collected
D. The high temperature has little use on the separation of emulsified oil

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单选题

Which of the electrical properties listed will always be the same for each component in a

A. Impedance
B. Current
C. Resistance
D. Voltage

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单选题

Gear pumps are of positive displacement type pumps because they discharge a near constant

A. depending on
B. in relative to
C. regardless of
D. because of

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单选题

STCW78/95 Convention describes that _____ are laid down for the certification of engineer

A. available minimum requirements
B. available maximum requirements
C. mandatory minimum requirements
D. mandatory maximum requirements

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单选题

A combination combustible gas and oxygen indicator is an instrument that measures the_____

A. purifies
B. combinations
C. concentrations
D. filters

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单选题

Some cranes are mounted in pairs on a common platform. which can be rotated through_____.

A. 360o
B. 270o
C. 180o
D. 90o

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单选题

A diesel engine exposed to widely varying ambient temperatures should use to a lubricating

A. a high viscosity index
B. a low viscosity index
C. neutralize acids
D. resist oxidation at high temperatures

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单选题

In a trunk type diesel engine piston, the thickness of the head or crown is determined by

A. I only
B. II only
C. both I and II
D. neither I nor II

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单选题

The lifting pressure of ____ is set in the presence of a Surveyor it is locked and cannot

A. fuel valves of main engine
B. injector pump of main engine
C. safety valves of marine boiler
D. safety valves of a reciprocating pump

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单选题

In a two-stroke engine, the piston consists of a lower part, which is named as and usually

A. low-half, cast iron; top-half, heat-resistant steel
B. low-half, aluminum; top-half, stainless steel
C. piston skirt; cast iron; piston crown; heat-resistant steel
D. piston skirt; aluminum; piston crown; stainless steel

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