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单选题The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.A shutB closingC openedD closed

题目
单选题
The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.
A

shut

B

closing

C

opened

D

closed

参考答案和解析
正确答案： C
解析： 暂无解析
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相似问题和答案

第1题：

单选题
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
A

natural aspiration

B

masked intake valves

C

air cells

D

scavenging air


正确答案： B
解析： 暂无解析

第2题：

单选题
The kids were especially______the coming Christmas because they would get lots of presents from their parents and uncles.
A

coming up with

B

looking forward to

C

making up for

D

getting rid of


正确答案： C
解析：

第3题：

The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.

A.fed from mechanical lubricators

B.thrown off from the main bearings

C.supplied from wick fed drip lubricators

D.flow from a centrifugal or banjo oiler


正确答案：A

第4题：

单选题
The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.
A

shut

B

closing

C

opened

D

closed


正确答案： A
解析： 暂无解析

第5题：

单选题
In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）
A

wide compression rings are used

B

oil rings are located above the piston

C

chromium plating is used on all piston rings

D

oil rings are located near the bottom of the piston skirt


正确答案： C
解析： 暂无解析

第6题：

单选题
The four-stroke cycle begins with the piston （）.
A

coming up from the BDC

B

coming up from the TDC

C

coming down from the BDC

D

coming down from the TDC


正确答案： A
解析： 暂无解析

第7题：

单选题
In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）
A

is coming upward；cylinder ring belt

B

is going downward；piston ring belt

C

is coming upward；piston ring belt

D

is going downward；cylinder ring belt


正确答案： D
解析： 暂无解析

第8题：

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by

A.natural aspiration

B.masked intake valves

C.air ceils

D.scavenging air


正确答案：D

第9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


正确答案： A
解析： 暂无解析

第10题：

单选题
The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being （）.
A

open

B

uncover

C

covered

D

closed


正确答案： C
解析： 暂无解析

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