You are planning to use the crude oil washing system on your tanker．What is required to prevent electrostatic buildup in the tanks ________．
A. The portable machines should be set at the proper drop for the first wash before the fixed machines are used
B. The tank used as the source for the tank cleaning machines should be debottomed for at least one meter
C. The inert gas system must reduce the oxygen content in the tank to at least 18%
D. The fixed machines must be operated simultaneously with the portable machines to equalize the electrostatic potential
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Your tanker is loaded down to her marks，and you find that she has too much trim by the stern．To adjust the trim，you may ______．
Add ballast forward
B. Load more cargo forward
C. Shift bunkers forward
D. All of the above
When the inert gas pressure is being ______ in the cargo tanks，particular attention should
A. topped up
B. braced
C. tommed down
D. shored
Which statement is TRUE concerning deep well self-priming pumps ________．
A. When loading oil cargo，it is always loaded via the discharge line through to the pump until the tank is topped off
B. Stripping systems are generally eliminated for the purposes of cargo handling
C. In recent years deep well pumps have become increasingly unpopular in product tankers and medium size crude ships
D. There is no danger of damaging the pump from overheating
Which statement is TRUE concerning insulating flanges ________．
A. They should be inspected and tested periodically to ensure that the insulation is clean and in good condition
B. Switching off a cathodic protection system may be substituted for using an insulating flange
C. The measured resistance value after installation should be less than 1，000 ohms
D. After the insulating flange is installed，hot work may be performed on deck
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