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In order to reverse the rotation of a two-stroke/cycle loop

题目
单选题
In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the （）.
A

starting air and fuel pumps

B

piston cooling pumps

C

exhaust valves

D

all of the above

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相似问题和答案

第1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2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3题：

英译中：Order cycle time


正确答案: 订货处理周期

第4题：

单选题
The size of the exhaust valve opening is （）
A

most critical in a four-stroke cycle diesel engine

B

most critical in a two-stroke/cycle diesel engine

C

most critical in a four-stroke/cycle diesel engine if it is turbocharged

D

of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine


正确答案： A
解析： 暂无解析

第5题：

单选题
In describing engine operation, what does the term “cycle” mean?（）
A

The sequence of events that produce a power pulse

B

One rotation of the engine crankshaft

C

One stroke of a piston

D

All of the above


正确答案： C
解析： 暂无解析

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


正确答案： A
解析： 暂无解析

第7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

第8题：

单选题
Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
A

less even torque

B

higher cylinder head temperatures

C

fewer power strokes per revolution

D

greater weight/size requirements


正确答案： A
解析： 暂无解析

第9题：

单选题
When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）
A

insufficient lubrication

B

improper piston cooling

C

blow-by

D

overload operation


正确答案： B
解析： 暂无解析

第10题：

单选题
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
A

Exhaust and scavenging

B

Scavenging and compression

C

Ignition and expansion

D

Exhaust and compression


正确答案： A
解析： 暂无解析

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