In the four-stroke engine, it takes （） to make one power stroke.

A、A.one propulsion

B、B.two propulsions

C、C.two revolutions

D、D.one revolution

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第1题

[单选题] Proper lubrication of theem> mainem> bearinem>gs is more easily obtainem>ed inem> a sinem>gle actinem>g, fourem>-strokeem>em>/cycle diesel enginem>e than inem> a tow-strokeem>/cycle diesel enginem>e because（）.

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第2题

[单选题] Theem> size of theem> exhaust valve openinem>g is （）

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第3题

[单选题] Theem> fourem>-strokeem>em> cycle is so called because it takes （） to complete theem> processes needed to convert theem> energy inem> theem> fuel inem>to work.

A、two strokeem>s of theem> piston B、fourem> strokeem>s of theem> piston C、one revolution of theem> crankshaft D、fourem> revolutions of theem> crankshaft

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第4题

[单选题] A turbocharged, fourem>-strokeem>em>/cycle diesel enginem>e has a larger valve overlap than a naturally aspirated fourem>-strokeem>em>/cycle diesel enginem>e, inem> order to inem> crease theem> （）.

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第5题

[单选题] Which of theem> followinem>g statements is true regardinem>g theem> inem>stallation of piston rinem>gs on two-strokeem>/cycle, diesel enginem>es as compared to fourem>-strokeem>em>/cycle, diesel enginem>es?（）

A、Inem> a two-strokeem>/cycle enginem>e, theem> rinem>gs run hotter, requirinem>g theem> end gap to be greater B、Some provision must be made inem> a two-strokeem>/cycle enginem>e to keep theem> rinem>gs from binem>dinem>g inem> theem> ports C、No gap is required to exist between theem> ends of theem> rinem>g when cold inem> a two-strokeem>/cycle enginem>e, but a small gap is required inem> a fourem>-stoke/cycle enginem>e D、Theem> gaps should be staggered on eitheem>r side of a piston inem> a two-strokeem>/cycle enginem>e, while staggerinem>g is not necessary inem> a fourem>-strokeem>em>/cycle enginem>e

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第6题

[单选题] If all otheem>r conditions such as bore, strokeem>, speed, and mean effective pressures are equal, a two-strokeem>/cycle diesel enginem>e will develop approximately（）

A、theem> same inem>dicated horsepower as a fourem>-strokeem>em>/cycle enginem>e B、twice theem> inem>dicated horsepower as a fourem>-strokeem>em>/cycle enginem>e C、one half inem>dicated horsepower as a fourem>-strokeem>em>/cycle enginem>e D、one power strokeem> for every two crankshaft revolutions

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第7题

[单选题] Proper lubrication of theem> mainem> bearinem>g is more easily obtainem>ed inem> a sinem>gle actinem>g fourem>-strokeem>em>/cycle diesel enginem>e than inem> a sinem>gle actinem>g two-strokeem>/cycle diesel enginem>e because （）

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第8题

[单选题] Scavenginem>g inem> a fourem>-strokeem>em>/cycle diesel enginem>e occurs durinem>g theem> （）.

A、last part of theem> exhaust strokeem>, and theem> first part of theem> inem>take strokeem> B、last part of theem> inem>take strokeem> only C、early part of theem> inem>jection strokeem> only D、early part of theem> power strokeem>