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单选题
Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）
A
Open the machine on both ends so as to allow the air and dust to escape
B
Be certain that the circuit breaker is opened and tagged on the feeder panel
C
Be certain that the air is clean and as dry as possible
D
All of the above
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更多 “单选题Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）A Open the machine on both ends so as to allow the air and dust to escapeB Be certain that the circuit breaker is opened and tagged on the feeder panelC Be certain that the air is clean and as dry as possibleD All of the above” 相关考题
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单选题When installing a hydraulic hose, which of the following precautions should be taken?（）A
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All of the above
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单选题When adding oil to a refrigeration system, precautions must be taken to ensure that （）.A
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单选题If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）A
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单选题When a deck cargo is secured with chain or wire lashings and grab (pear) links，which statement is FALSE?（）A
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单选题What additional precautions should be taken when making temporary repairs to a ship that is operating when hydrogen sulfide is present?（）A
Seal off all tank and compartment ventilationB
Remove all bulk materials from the P-tanksC
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单选题Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?（）A
Commence draining that tank as quickly as possibleB
Seal off all vents to that tankC
Activate the CO2 system to that tankD
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单选题Which of the following actions should be taken by the engine room watch when the general alarm is sounded continuously?（）A
The fire pump should be startedB
The boiler rims should be securedC
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单选题When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）A
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单选题An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）A
The breaker should be closed when one synchronizing lamp is dark and the other is brightB
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单选题Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）A
clean the flame scanner photocell windowB
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单选题To safeguard the operator and other personnel working on or near a hoisting operation which of the following precautions should be observed?（）A
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单选题Which of the actions listed should be taken by the engineer on watch when the general alarm is sounded continuously for 10 seconds?（）A
Engine room ventilation should be startedB
Main engines should be securedC
The fire pump should be startedD
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单选题Which of the precautions listed should be observed when taking on diesel fuel?（）A
Secure all lighting to the main deckB
Provide a portable fan to blow away fumesC
Prohibit smoking in the areaD
Display a black triangle during daylight hours
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单选题Which precaution should be taken when testing a line throwing gun?（）A
Never remove the line from the rocketB
Fire it at an angle of approximately 90 degrees to the horizonC
Wear asbestos glovesD
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考题
单选题Which statement is FALSE concerning precautions during fueling operations?（）A
All engines，motors，fans，etc. should be shut down when fuelingB
All windows，doors，hatches，etc. should be closedC
A fire extinguisher should be kept nearbyD
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单选题If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）A
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Apply fire fighting water through the crankcase breatherC
Allow the engine to cool before opening the crankcaseD
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单选题Which of the following precautions should always be carried out in dry dock?（）A
Liquids should never be transferred between tanks without consulting the dock masterB
If sea valves have been disassembled, all bonnets must be checked for leakage when the ship is re-floatedC
Before re-floating, all sea chest strainers should be verified as having been replacedD
All of the above
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单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
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单选题When using slings，cargo handlers should take all the following precautions except（）.A
Ensure that slings are securely fastened around the loadB
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Exercise care when using hooks，crowbars，and similar toolsD
Keep the loads as close to the rail or deck as possible
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