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Open ullage holes in tanks which are not gas-free must be protected by ______.
A.PV valves
B.warning signs
C.flame screens
D.stop-check valves
参考答案
更多 “ Open ullage holes in tanks which are not gas-free must be protected by ______.A.PV valvesB.warning signsC.flame screensD.stop-check valves ” 相关考题
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When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it ______.A.one meter from the tank bottom and one meter below the tank topB.one half the ullage of the tank and one meter below the tank topC.one half the ullage of the tank and one meter above the tank bottomD.at three meter intervals from the tank top to the bottom
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Which statement is TRUE concerning protection of double bottom tanks against excessive pressure?A.Each vent for the tank must be equal to the area of the tank filling lineB.The tanks must be protected by overflowsC.The total area of the vents or the overflow shall be at least equal to the area of the fill lineD.There must be twice as much vent area as the area of the fill line
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Which of the following is a prerequisite for running DBMS_TDB.CHECK_DB to a successful completion？（）A、 The database must be in read-write mode.B、 The database must have no external files.C、 The database must open in read-only mode.D、 The database must be mounted but not opened.
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单选题When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.A
one meter from the tank bottom and one meter below the tank topB
one half the ullage of the tank and one meter below the tank topC
one half the ullage of the tank and one meter above the tank bottomD
at three meter intervals from the tank top to the bottom
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单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.A
a subsequent temperature rise will cause the cargo to overflowB
air pockets may cause the cargo to bubble out of the ullage holeC
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the tank valve may be stiff and a spill will occur before the valve can be closed
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The cargo will spontaneously ignite if released to the atmosphereB
You must operate this barge as a lead bargeC
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The barge must be in a protected position within the tow
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单选题You are on a cargo vessel carrying toluol in bulk in portable tanks. Which is a requirement for pumping the toluol? （）A
Hose connections to the tank must be made with a minimum of three boltsB
There must be water pressure on the fire mainC
You must shut down if another vessel comes alongsideD
If transferring at anchor，you must display a red flag by day and a red light at night
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单选题When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.A
one meter from the tank bottom and one meter below the tank topB
one half the ullage of the tank and one meter below the tank topC
one half the ullage of the tank and one meter above the tank bottomD
at three meter intervals from the tank top
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increaseB
decreaseC
stopD
remain constant
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单选题When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.A
water in the tanks or pipelinesB
having the cargo too coolC
explosion of vapors after dischargeD
inadequate ullage space
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单选题Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?（）A
Increased viscosity of the product needs higher loading pressure, which increases the chances of a spillB
Air pockets may cause the fuel to bubble out of the ullage holeC
The temperature rise of the fuel will cause an overflowD
Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
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单选题Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）A
Each vent for the tank must be equal to the area of the tank filling lineB
The tanks must be protected by overflowsC
The total area of the vents or the overflow shall be at least equal to the area of the fill lineD
There must be twice as much vent area as the area of the fill line
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单选题Open ullage holes in tanks which are not gas-free must be protected by（）.A
PV valvesB
warning signsC
flame screensD
stop-check valves
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单选题RMAN enables you to open the target database when it is already mounted. Which command must you execute at the RMAN prompt to open the database？（）A
’SQL ALTER DATABASE OPEN’；B
SQL ALTER DATABASE ’OPEN’；C
OPEN DATABASE；D
DATABASE OPEN
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单选题0pen ullage holes in tanks which are not gas-free must be protected by（）.A
PV valvesB
warning signsC
flame screensD
stop-check valves
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