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After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean?______.
A.The unit is working properly
B.The face mask is not sealed properly
C.The air bottle needs to be refilled
D.The air supply hose has a leak
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更多 “ After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean?______.A.The unit is working properlyB.The face mask is not sealed properlyC.The air bottle needs to be refilledD.The air supply hose has a leak ” 相关考题
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The bypass valve on a self-contained breathing device should be opened if ______．A.You are entering a space containing poisonous vaporsB.You are entering a space containing explosive gasesC.The regulator of the breathing apparatus malfunctionsD.The face piece of the breathing device is too tight
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单选题The bypass valve on a self-contained breathing device should be opened if（）.A
you are entering a space containing poisonous vaporsB
you are entering a space containing explosive gasesC
the regulator of the breathing apparatus malfunctionsD
the face piece of the breathing device is too tight
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单选题Which item is NOT included in the fireman’s outfit on a cargo vessel?（）A
Fire axB
FlashlightC
rigid helmetD
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单选题Clean air standards referred to as “Grade D” apply to compressed air for use in（）.A
high pressure fluid accumulatorsB
driving air-powered plunger pumpsC
filling open-circuit breathing systemsD
bladder-type accumulators
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单选题Gas masks（）.A
should be worn while fighting a fireB
can be used in atmospheres deficient in oxygenC
filter contaminants from air that is to be breathedD
may be substituted for a self-contained breathing apparatus
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单选题A self-contained breathing apparatus is used to（）.A
make underwater repairs to bargesB
determine if the air in a tank is safe for menC
enter areas that may contain dangerous fumes or lack oxygenD
resuscitate an unconscious person
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单选题When an auxiliary boiler is panting and emitting black smoke, you should （）.A
increase the fuel oil temperatureB
decrease the fuel oil temperatureC
decrease the fuel oil supply pressureD
increase the air supply
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单选题Fire protection regulations for towing vessels require training in all of the following，EXCEPT（）.A
putting on a fireman's outfit，if the vessel is so equippedB
donning a self-contained breathing apparatus，if the vessel is so equippedC
activating the general alarm and reporting inoperative alarm systems and fire-detection systemsD
refilling and servicing all expended fire extinguishing equipment
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Attempt to determine what is burningB
Acquire the nearest self contained breathing apparatusC
Break out the nearest fire hoseD
Wait for the fire team to arrive and assist as directed
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单选题After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell.What does this mean?（）.A
The unit is working properlyB
The face mask is not sealed properlyC
The air bottle needs to be refilledD
The air supply hose has a leak
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单选题If you are unable to stop a diesel engine by any other means，you should（）.A
discharge a CO2 extinguisher in the air inletB
pull off the distributor capC
secure the jacket waterD
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单选题The function of the bypass valve on the self-contained breathing apparatus is to（）.A
control the pressure of the oxygen as it enters the bodyB
allow the wearer to manually give himself oxygenC
release excess heat which would otherwise cause the bottle to explodeD
allow exhaled gases to pass outside the bottle
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单选题Which emergency equipment should you keep near the towing bitts（）.A
A self-contained breathing apparatusB
A boat hook and a spanner wrenchC
A fire ax and/or cutting torchD
A Stokes litter basket
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单选题Which emergency equipment should you keep near the towing bitts? （）A
A self-contained breathing apparatus (SCBA)B
A boat hook and a spanner wrenchC
A fire ax and/or cutting torchD
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单选题You are about to enter a compartment to investigate a suspected smoldering fireIf youre not wearing a self-contained breathing apparatus, you should test the compartments atmosphere to determine if there is/are （）.A
sufficient oxygen to sustain human lifeB
an explosive mixture in the compartmentC
a toxic atmosphere in the compartmentD
All of the above
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单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）A
Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiationB
Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gasC
Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gasD
This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless gas
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单选题A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.A
a gas mask certified by the Mine Safety and Health AdministrationB
the same self-contained breathing apparatus required with the fireman's outfitC
an oxygen breathing apparatus，provided that the device has been inspected within three yearsD
a portable ventilation system that will provide a complete change of air every three minutes
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