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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 vapors
B
you are entering a space containing explosive gases
C
the regulator of the breathing apparatus malfunctions
D
the face piece of the breathing device is too tight
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On a ship, the locker or space containing the self-contained breathing apparatus must _____.A.be located in close proximity to the main control stationB.be equipped with battery powered emergency lightingC.be marked SELF-CONTAINED BREATHING APPARATUSD.All of the above
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What is one way to escape hardware bypass mode?()
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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
考题
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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fuel supply valve should be closedB
hatches，doors，and oar ports should be closedC
air cylinder shut-off valve should be closedD
engine should be shut off
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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
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resuscitate an unconscious person
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单选题If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）A
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单选题The C02 flooding system is actuated by a sequence of steps which are（）.A
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单选题The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.A
pressure differences in the atmosphereB
the length of the hose attached to the facepieceC
the physical exertion of the person wearing the deviceD
spaces containing poisonous vapors
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excessive valve lashC
excessive lube oil consumptionD
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单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
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单选题If the head pressure is too high,（）A
the relief valve should open before the high-pressure cutoutB
the relief valve should open and let excess refrigerant go to receiverC
the high-pressure cutout switch should operate before the relief valve opensD
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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
考题
单选题What is one way to escape hardware bypass mode?（）A
Reset the cabling.B
Power cycle the device.C
Bounce the service tunnels.D
Unlock the device from the console.
考题
单选题The self-contained breathing device should not be used in which situation?（）A
Oxygen deficient spacesB
Compartments containing poisonous vaporsC
Fighting fires that produce heavy smokeD
Underwater search
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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
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考题
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
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考题
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The basic training in fire prevention and fire fighting should include the practical elements which should allow the trainees to acquire the ability to （）.A
use self-contained breathing apparatusB
use various types of portable fire extinguishersC
effect a rescue in a smoke-filled space wearing breathing apparatusD
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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