航海英语(甲类船长)船舶结构与设备单选题练习2
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Which statement about tunnel bow thrusters fitted to large vessels is TRUE ________．
- A.They are effective on most vessels at speeds up to 10 knots
- B.Because of their location，most modern installations have as much power as a tug
- C.They are fully effective at all drafts
- D.When going astern at slow speed，they provide effective steering control
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Which type of davit is not considered to be a mechanical davit ________．
- A.Sheath-screw boom
- B.Radial
- C.Crescent
- D.Quadrantal
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Which davit type may be operated by one man ________．
- A.Quadrantal
- B.Gravity
- C.Sheath-screw
- D.Radial
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Which pump must always be primed ________．
- A.Centrifugal pump
- B.Reciprocating pump
- C.Rotary pump
- D.All of the above
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When the helm is turned on the navigation bridge，which of the listed actions will be the FIRST response in the steering room on a ship equipped with an electro-hydraulic steering gear ________．
- A.The pumps go to full stroke
- B.The six-way valve aligns itself with the running pump
- C.Both port and starboard cables are energized
- D.The synchronous receiver turns，duplicating the helm motion
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When stowed on steel decks，the strongbacks and pontoons shall be secured with ______．
- A.Dunnage or other suitable material
- B.other strongbacks
- C.hatch covers
- D.other pontoons
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What would white exhaust smoke from a diesel engine probably mean ________．
- A.Late fuel injection
- B.Excess combustion air
- C.Dribbling injector tips
- D.Excessive lube oil consumption
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What prevents water running along the shaft of a leaking centrifugal pump from entering the shaft bearing ________．
- A.Shaft seal
- B.Water flinger
- C.Drain hole
- D.Lantern ring
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What quality of a diesel fuel is most significant for efficient combustion ________．
- A.Volatility
- B.Viscosity
- C.Flash point
- D.Specific heat
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What power source actuates a solenoid valve ________．
- A.Air pressure
- B.Hydraulic pressure
- C.Electric current
- D.Mechanical force
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GMDSS试题练习(1)
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