海船船员考试

单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A The diesel oil must never be allowed to mix with the heavy fuelB The temperat

题目
单选题
When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）
A

The diesel oil must never be allowed to mix with the heavy fuel

B

The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve

C

The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve

D

The heating steam must be secured before the diesel oil passes through the three-way valve

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相似问题和答案

第1题：

单选题
The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）
A

the same, whether at sea, or during maneuvering

B

adjusted during each hour of operation while at constant RPM

C

higher at sea than while maneuvering

D

lower at sea than while maneuvering


正确答案： C
解析： 暂无解析

第2题：

单选题
While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）
A

Manually trip the over-speed device

B

Interrupt the fuel flow to the engine

C

Disengage the safety interlock

D

Slide the camshaft to the neutral position


正确答案： B
解析： 暂无解析

第3题：

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.

A.large conical springs

B.compressed air pressure

C.hydraulic pressure

D.exhaust gas pressure


正确答案：B

第4题：

单选题
Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）
A

increasing the quantity of starting air

B

increasing the lube oil pressure

C

heating the engine fuel supply

D

heating the engine coolant


正确答案： A
解析： 暂无解析

第5题：

单选题
The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A

direct action of cam shaft

B

compressed air pressure

C

hydraulic “push rods”

D

direct action of the main piston moving down


正确答案： A
解析： 暂无解析

第6题：

单选题
On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A

dial indicator

B

outside caliper

C

bridge gauge

D

tram rod


正确答案： D
解析： 暂无解析

第7题：

单选题
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A

excessive crankcase pressure

B

excessive lube oil temperature

C

contamination of the lube oil by water

D

contamination of the cooling water by lube oil


正确答案： C
解析： 暂无解析

第8题：

单选题
One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.
A

the extra weight required for the diesel reduction gearing

B

a minimum speed for the engines that limits the minimum speed of the vessel

C

the higher fuel consumption per SHP

D

the low efficiency of the system when a controllable pitch propeller is used


正确答案： C
解析： 暂无解析

第9题：

单选题
Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）
A

cooling water leaving each cylinder

B

fuel oil entering the injector

C

exhaust gases at various locations

D

lube oil at the bearing supplies


正确答案： A
解析： 暂无解析

第10题：

单选题
In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）
A

fuel must be preheated

B

intake air should be preheated

C

lube oil outlet temperature should be increased 20℃ above normal

D

none of the above


正确答案： B
解析： 暂无解析

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