海船船员考试

单选题If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）A The wearing rings are excessively wornB The suction strainer is cloggedC The discharge valve is c

题目
单选题
If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）
A

The wearing rings are excessively worn

B

The suction strainer is clogged

C

The discharge valve is clogged

D

The shaft is worn

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相似问题和答案

第1题：

how can you create good vacuum on the fresh water (FW) distiller ?


正确答案：First of all ,to create good vacuum on the FW distiller .i must make sure that the internal chamber is sealed against possible entrance of the air during operation .secondly ,the air ejector and ejector pump should be in good condition .thirdly ,some revelant valves parking should be sealed against air leakage ,lastly ,the unit should be free from scales (水垢) 。both on its condenser and heater .

第2题：

单选题
If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.
A

worn gland sealing shaft

B

worn wearing rings

C

a bent shaft

D

reversed pump coupling


正确答案： C
解析： 暂无解析

第3题：

Will we connect the motor with the fresh water pump? No, the pump is ( )_

A.in good order

B.out of order

C.works well


正确答案：B

第4题：

单选题
The （）pump is usually used as the bilge feed pump to an oily water separator.
A

turbine

B

screw

C

vane

D

ejector


正确答案： B
解析： 暂无解析

第5题：

单选题
The （）pump is usually used as the emergency bilge pump.
A

turbine

B

screw

C

vane

D

ejector


正确答案： D
解析： 暂无解析

第6题：

Which method should be used to warm up the pump turbines prior to discharge ________．

A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reached

B.Run the pump at high speed with the discharge valves closed

C.Run the turbine at slow speed with the pump disconnected

D.Shut the discharge valve and run the pump at slow speed


正确答案：D

第7题：

单选题
The bilge system has been performing well; however, the aft starboard engine room bilgewell suddenly fails to be pumped outWhich of the following should be done first to determine the cause?（）
A

Open the bilge pump for inspection

B

Remove each of the manifold valves

C

Remove only the manifold valve to the affected bilge-well

D

Attempt to pump out another bilge well to determine if the entire system is affected


正确答案： A
解析： 暂无解析

第8题：

How to pump out bilge water in the engine room?


正确答案：Pump bilge water into sludge tank. Then pump bilge water into oily water separator. Enquire master or deck officers on duty to pump out at appropriate water. The proportion should not beyond 15 PPM.机舱排污水程序可表述为把污水排到污水集中柜内，再通过油水分离器在允许排放区域按含油量小于15 PPM排放。

第9题：

单选题
A centrifugal bilge pump requires priming （）.
A

primarily to lubricate the shaft seals

B

due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller

C

to initially unload the pump by having its head pressure equal to discharge pressure

D

in order to overcome the potential energy of water in the discharge line


正确答案： D
解析： 暂无解析

第10题：

单选题
Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to（）
A

allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque

B

prevent either main pump from being hydraulically motored when idle by cross pressure flow

C

prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system

D

all of the above


正确答案： D
解析： 暂无解析

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