Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）

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• In using reduction gears to obtain efficient propeller speeds, （）.

  A . they must be located at the after end of the engine B . they can only be used with one engine at a time C . they eliminate the need for controllable pitch propellers D . they are connected to the engine with a flexible coupling

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• 减少（Reduction）

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• A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of（）.

  A . water B . babbitt C . iron or steel D . acid

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• I saw your man not operating the winch gear（）gear.

  A . in B . by C . of D . against

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• Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）

  A . corrosion on the gears B . excessive gear speed C . dirt in the oil D . misalignment of the gear

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• 消声sound attenuation；moise reduction sound deadening

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• 异化型硝酸还原（dissimilartive nitrate reduction）

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• （） allows the engine to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.

  A . Diesel engine propulsion B . Diesel electric propulsion C . Steam engine propulsion D . Gas turbine propulsio

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• “3R”指的是Reduction：：“（）”、Replacement：“（）”、Refinementt：“优化”。

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• Worm geared automatic mooring winches are （） as the multi-start feature reduces the advantage of worm gear iethe high gear radio.

  A . popular B . common C . in lead position D . uncommo

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• 标准还原电位（E°ˊ）（standard reduction potential）

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• With（） the engine need not to be aligned with reduction gears or propeller shaft.

  A . Diesel engine propulsion B . Diesel electric propulsion C . Steam engine propulsion D . Gas turbine propulsio

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• Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）

  A . must churn the oil in the sump B . is connected to the propeller shaft C . is driven at the highest RPM D . compensates for alignment variations between the engine and pinion gear

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• In the cargo winch, spur reduction gearing transfers the motor drive to （）.

  A . the toping light B . the board brake C . the fail-safe D . the barrel shaft

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• 罗伯特・希斯提出的危机管理5R模式中的“reduction减缓”指的是（）

  A . 及时预防 B . 有效应对 C . 减低风险 D . 及时恢复

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• Proper operation of the main engine reduction gear set requires the operation to monitor （）

  A . the sump oil level B . oil flow sight glasses C . bearing temperatures D . all of the above

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• Wear occurring at the tips of the reduction gear teeth is usually the result of （）.

  A . surface fatigue B . fretting corrosion C . heavy overloading D . gear misalignment

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• Diesel engine mufflers accomplish noise reduction by （）

  A . reducing exhaust gas velocity B . increasing the frequency of gas vibration C . the use of long head pipes D . the use of zinc electrode

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• 同化型硝酸还原（assimilative nitrate reduction）

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• When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to （）

  A . maintain alignment when the ship’s hull is working in heavy seas B . ensure engine vibrations correspond to the natural frequency of the hull C . permit the engine to expand away from the driven equipment as the engine heats up and expands D . maintain engine thrust bearing clearance

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• 隔声量sound reduction index

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• 撞击声压级改善量reduction of impact sound pressure level

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• 十倍减少时间（decimal reduction time，D）

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• C200 PTU装配线hypoid gear和pinion gear的追溯方式是（）

  A．单件追溯 B．批次追溯 C．按天追溯 D．不追溯

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