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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You are on a tanker designed to carry molten sulfur．Which statement is TRUE ________．
A. There must be two portable toxic vapor detectors on board
B. The cargo tank ventilation system must maintain the H2S vapor concentration at 1.85% or more by volume
Cargo temperature may be taken by portable thermometers
D. The pressure in the heating coils in the tanks must be less than that of the cargo exerted on them
Which statement is TRUE concerning cargo hose on tank barges ________．
A. Cargo hose must be able to withstand the shut-off head plus the static head of the cargo pump
B. Cargo hose must be able to withstand the static head of the cargo pump but no less than 100 psi
Cargo hose must be able to withstand the shut-off head less the static head of the cargo pump but no less than 100 psi
D. Cargo hose must be able to withstand at least 150 psi
You are on a tanker discharging oil．When all of the oil that the main cargo pumps can handle is pumped out of a tank，the remainder is ______．
A. Stripped out and pumped directly ashore into the mainline as the remaining cargo tanks are pumped out with the main pumps
B. Stripped to one tank and then pumped out with the main pumps
C. Stripped out and pumped directly ashore after all the tanks have been emptied by the main pumps
D. Gravitated to the centers from the wings and pumped out with the main pumps
Which of the following product（s）would be classified as grade E ________．
A. Gasoline
Bunker C
C. Kerosene
D. All of the above
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