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
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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
A.changing pump discharge pressure in response to normal load variations
B.a high oil level
C.incorrect fluid viscosity
D.continued slow re-circulation of the oil
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
One cause of high head pressure occurring in a refrigeration system can be ().
A salinity indicator is used to determine the ().
Which of the listed pumps is NOT a positive displacement pump?()
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
A salinity indicator is used to determine the ().
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?()
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
The usual symptoms of cavitation in a centrifugal pump is ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().