A.Ball float
B.Thermostatic
C.Bimetallic
D.Impulse
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A.a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided
B.it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus
C.spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus
D.all of the above
A.to inject cleaning additives when the bilges are extremely dirty
B.when the main condenser becomes fouled, in order to provide additional cooling water circulation
C.to connect the rose box to the independent bilge suction
D.if the bilges become flooded and they can not be emptied by any other means
A.frequently grounding out
B.frequently starting and stopping
C.running too fast
D.running too slow
A.completely filled with saltwater
B.filled with de-scaling compound
C.tightly closed to exclude air
D.vented to the atmosphere
A.second stage cylinder lockup
B.oil sump contamination
C.faulty operation of pneumatic valves
D.corrosion of air receiver baffles
最新試題
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Thermostatic expansion valves can be adjusted for （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A pressure drop through the refrigerant liquid line may cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Which of the following statements is correct concerning heat transfer?（）
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.