A crankshaft whose center of gravity coincides with its center line is said to be（）<br /> Ⅰ.statically balanced<br /> Ⅱ.dynamically balanced..

第1题

[单选题] A crankshaft whose center of gravity coincides with its center line is said to be （）.

A、dynamically balanced B、statically balanced C、counter balanced D、resonantly balanced

第2题

[] The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the （）.

A、A.crankshaft B、B.piston C、C.connecting rod D、D.bearing

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第3题

[单选题] Critical speed in diesel engines occurs when engine torque pulsations become （）

A、opposed to the crankshaft rocking couple B、resonant with the crankshaft natural frequency C、critical fore and aft crankshaft vibrations D、horizontal whipping motions of the crankshaft

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第4题

[] In a four-stroke/cycle diesel engine, the camshaft rotates at （）

A、A.twice the crankshaft speed B、B.half the crankshaft speed C、C.the same speed as that of the crankshaft D、D.a speed independent of that of the crankshaft

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第5题

[单选题] Each cylinder in a two stroke cycle engine experiences combustion（）.

A、once each crankshaft revolution B、twice each crankshaft revolution C、every other crankshaft revolution D、every fourth stroke

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第6题

[单选题] The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）

A、one half crankshaft speed in a two-stroke cycle diesel engine B、crankshaft speed in a two-stroke cycle diesel engine C、two times crankshaft speed in a two-stroke cycle diesel engine D、one-fourth times crankshaft speed in a four-stroke cycle diesel engine

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第7题

[单选题] （）means any person by whom or in whose name or on whose behalf a contract of carriage of goods by sea has been concluded with a carrier，or any person by whom or in whose name or on whose behalf the goods are actually delivered to the carrier in relation to the contract of carriage of goods by sea.

A、Shipper B、Charterer C、Shipowner D、Carrier

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第8题

[单选题] （）means any person by whom or in whose name or on whose behalf a contract of carriage of goods by sea has been concluded with a carrier，or any person by whom or in whose name or on whose behalf the goods are actually delivered to the carrier in relation to the contract of carriage of goods by sea.

A、Shipper B、Charterer C、Shipowner D、Carrier

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第9题

[单选题] Which of the following radar contacts will present the most immediate danger?（）.

A、A vessel on the starboard bow whose bearing is changing and range is decreasing B、A vessel on the starboard bow whose bearing is steady and range is increasing C、A vessel on the port bow whose bearing is steady and range is decreasing D、A vessel on the port bow whose bearing is changing to the left and range decreasing

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A crankshaft whose center of gravity coincides with its center line is said to be（）<br /> Ⅰ.statically balanced<br /> Ⅱ.dynamically balanced

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