The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.

A、A.forged

B、B.cast

C、C.made

D、D.shrunk

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更多“The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.”相关的问题

第1题

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

A、A.twice m>them> crankshaft speed B、B.half m>them> crankshaft speed C、C.m>them> same speed as that m>ofm> m>them> crankshaft D、D.a speed independent m>ofm> that m>ofm> m>them> crankshaft

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第2题

[单选题] m>Them> main moving parts m>ofm> a diesel engine consist m>ofm> m>them> （） and m>them> pistons.

A、bedplate, connecting rods B、crankshaft, m>them> connecting rods C、frames, crossheads D、crankshaft, m>them> cylinder

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第3题

[单选题] m>Them> four-stroke cycle is so called because it takes （） to complete m>them> processes needed to convert m>them> energy in m>them> fuel into work.

A、two strokes m>ofm> m>them> piston B、four strokes m>ofm> m>them> piston C、one revolution m>ofm> m>them> crankshaft D、four revolutions m>ofm> m>them> crankshaft

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第4题

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

A、opposed to m>them> crankshaft rocking couple B、resonant with m>them> crankshaft natural frequency C、critical fore and aft crankshaft vibrations D、horizontal whipping motions m>ofm> m>them> crankshaft

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第5题

[单选题] One method m>ofm> determining crankshaft misalignment is by（）

A、laying a straight edge across m>them> crank webs at m>them> crankpin and measuring m>them> distance to m>them> crankpin in two places B、measuring m>them> crank drop on eim>them>r side m>ofm> each crank throw while m>them> crankshaft is slowly rotated through one revolution C、rotating m>them> crankshaft through one revolution, pausing each 90om>ofm> rotation to measure bearing clearances, top and bottom D、taking micrometer reading between m>them> crank cheeks opposite m>them> crankpin every 90°m>ofm> crank angle rotation

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第6题

[单选题] m>Them> cubic inch(or liter) displacement m>ofm> a cylinder is determined by m>them> diameter m>ofm> m>them> piston and m>them> （）

A、length m>ofm> m>them> crankshaft B、volume m>ofm> m>them> clearance space C、weight m>ofm> piston D、length m>ofm> m>them> stroke

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第7题

[单选题] In four strokes engine, m>them> cycle m>ofm> events is completed in four strokes m>ofm> （）.

A、m>them> cylinder B、m>them> crankshaft C、m>them> piston D、m>them> cross-head

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第8题

[单选题] In describing engine operation, what does m>them> term “cycle” mean?（）

A、m>Them> sequence m>ofm> events that produce a power pulse B、One rotation m>ofm> m>them> engine crankshaft C、One stroke m>ofm> a piston D、All m>ofm> m>them> above

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第9题

[单选题] Because m>them> tie bolts are so close to m>them> crankshaft, some engines employ （）to hold m>them> crankshaft main bearing cap in position instead m>ofm> conventional studs and nuts.

A、through bolts B、jack bolts C、tap bolts D、fitted bolts

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第10题

[单选题] During m>them> dock repair, should be measured firstly before tail shaft drawn out（）

A、m>them> sinking m>ofm> tail shaft B、m>them> clearance m>ofm> stern bearing C、m>them> total flexure m>ofm> shaft D、main engine crankshaft deflection

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