海船船员考试

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 beltB is going downward；piston ring beltC is coming upward；piston ring beltD is going downward；cylin

题目
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

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相似问题和答案

第1题：

If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the

A.cylinder compression pressure may not be high enough

B.cylinder compression temperature may be too high

C.fuel oil injection pressure may not be high enough

D.scavenge and purge process is incomplete


正确答案：A

第2题：

单选题
If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?（）
A

Increase the cooling water flow to the engine

B

Secure or reduce fuel to that cylinder

C

Screw down on the pressure adjusting spring to decrease to decrease popping pressure

D

Readjust the injection timing


正确答案： A
解析： 暂无解析

第3题：

If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.

A.backfire through the air intakes

B.develop less power under load

C.have high firing pressures

D.lift its cylinder relief valves


正确答案：B

第4题：

单选题
In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.
A

fluctuates with the engine speed to some extent, independent of the engine speed

B

keeps constant at all engine speed, dependent on the engine speed to some extent

C

keeps constant at all engine speed, independent of the engine speed

D

is decided by the engine speed, constant at all engine speed


正确答案： B
解析： 暂无解析

第5题：

单选题
If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）
A

excessively late injection timing for each cylinder

B

incorrectly adjusted intake valve timing

C

incorrectly adjusted fuel injector

D

incorrectly adjusted intake valve clearance


正确答案： A
解析： 暂无解析

第6题：

In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.

A.low firing pressure

B.low exhaust temperature

C.mechanical knock in each cylinder

D.fuel knock in each cylinder


正确答案：A

第7题：

单选题
A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）
A

feel the high pressure fuel line

B

check the cylinder exhausts for white smoke frequently

C

check the cylinder exhaust temperature

D

isolate each cylinder and inspect the injector


正确答案： A
解析： 暂无解析

第8题：

High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).

A.decreased piston to cylinder head clearance

B.increased exhaust system back pressure

C.early fuel injection timing

D.low scavenge air temperature


正确答案：C
解析：decrease：减少;clearance：间隙
译文：喷油定时过早会引起柴油机爆炸压力偏高、排温偏低。

第9题：

单选题
High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A

decreased piston to cylinder head clearance

B

increased exhaust system back pressure

C

early fuel injection timing

D

low scavenge air temperature


正确答案： B
解析： 暂无解析

第10题：

单选题
In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）
A

low firing pressure

B

low exhaust temperature

C

mechanical knock in each cylinder

D

fuel knock in each cylinder


正确答案： A
解析： 暂无解析

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