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单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A has little or no internal frictionB has a lower effective compression ratioC operat

题目
单选题
A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）
A

has little or no internal friction

B

has a lower effective compression ratio

C

operates with scavenge air under a positive pressure

D

operates without energy absorbing intake and exhaust strokes

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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
Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）
A

increase in starting air pressure

B

increase in lube oil viscosity

C

compression expansion device

D

jacket water heater


正确答案： A
解析： 暂无解析

第3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4题：

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


正确答案： A
解析： 暂无解析

第5题：

单选题
Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）
A

Holding the valve open for a long period

B

Increasing the starting air pressure used

C

Opening the stating air valve quickly

D

Reducing the starting air valve size


正确答案： D
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
When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A

intake stroke

B

compression stroke

C

power stroke

D

exhaust stroke


正确答案： A
解析： 暂无解析

第8题：

In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?

A.Noise coming from that air starting valve

B.Continuous operation of the starting air compressor

C.Zero air pressure in the air starting system

D.Overheated starting air pipe to the cylinder head


正确答案：D

第9题：

单选题
A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）
A

low lube oil temperature

B

low starting air temperature

C

air bubbles in the fuel oil system

D

water in the starting air system


正确答案： A
解析： 暂无解析

第10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

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