The exhaust ports are located around the lower part of the cylinder liner, （）the products of combustion are driven by scavenging air...

第1题

[单选题] In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.

A、scavenging air ports；exhaust ports B、inlet ports；scavenging air ports C、scavenging air ports；inlet ports D、exhaust ports；inlet ports

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第2题

[单选题] It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.

A、inlet port B、exhaust port C、spill port D、scavenge port

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第3题

[单选题] Pressurized air enters the cylinder via the inlet ports and pushes the remaining exhaust gas from the cylinder in a process known as “（）”.

A、charging B、super charging C、scavenging D、exhausting

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第4题

[单选题] A piston is at bottom dead center when it is（）

A、opening the exhaust ports B、closing the fuel ports C、farthest from the cylinder head D、nearest to the cylinder head

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第5题

[单选题] The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the （）

A、reciprocating motion of exhaust valves B、rotary motion of the camshaft C、reciprocating motion of the piston D、developed differential

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第6题

[单选题] The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.

A、behind B、far from C、adjacent to D、in front of

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第7题

[单选题] The exhaust valve is opened at about the same time （） the air inlet ports are opened.

A、before B、after C、when D、until

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第8题

[] In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure

A、A.Ⅰonly B、B.Ⅱonly C、C.bothⅠand Ⅱ D、D.neitherⅠnor Ⅱ

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第9题

[单选题] The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）

A、direction of air flow within the cylinder B、sequence of port opening C、method of opening exhaust ports D、volume of air admitted to the cylinder

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第10题

[] Clogged or partially obstructed exhaust ports on a diesel engine can cause（）

A、A.over-speeding of the engine B、B.failure of the engine to shut down C、C.no effect of engine mounting bolts D、D.high exhaust temperatures

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The exhaust ports are located around the lower part of the cylinder liner, （）the products of combustion are driven by scavenging air.

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