Examkin

Soru

Zorluk: ZorFires and Fire Extinguisher Use

Commercial vehicle fires require distinct suppression tactics based on the fuel source and location on the vehicle. Match each commercial vehicle fire scenario with its correct primary containment and suppression protocol.

  • Engine compartment fire with smoke emanating from under the hoodKeep the hood latched, turn off the engine, and discharge extinguishing agent through the grille louvers or from underneath the vehicle to avoid feeding oxygen to the fire.
  • Smoldering rubber fire on a trailer dual-tire assemblyDouse thoroughly with large quantities of water or an approved Class A agent, continuing application until the rubber is fully cooled below re-ignition temperature.
  • Dashboard electrical fire with active wiring arcing behind the instrument panelCut main battery power/ignition immediately and apply a non-conductive B:C dry chemical agent into access panels, avoiding all water or conductive liquids.
  • Burning diesel fuel pool on the ground beneath a ruptured fuel tankStand upwind at an adequate safety distance, aim the B:C dry chemical nozzle at the base of the burning liquid, and sweep side-to-side across the entire perimeter.

Cevap

Engine compartment fire matches discharging through louvers/underneath while keeping the hood latched; dual-tire fire matches thorough dousing with water/Class A agent until fully cooled; dashboard electrical fire matches cutting main power and applying non-conductive B:C agent; diesel pool fire matches aiming B:C dry chemical at the base of the liquid with a sweeping motion upwind.
Each commercial vehicle fire location involves specific materials and hazards: engine fires require containment without introducing oxygen by keeping the hood latched; tire fires involve deep-seated Class A rubber combustion requiring thorough water cooling; electrical fires demand non-conductive suppression after cutting circuit power; and flammable fuel spills require sweeping B:C dry chemical across the liquid base from an upwind position.

Adım Adım Çözüm

1
Analyze the engine compartment fire scenario regarding airflow and containment.
Identify that opening the hood provides excess oxygen, causing a flare-up. Extinguishing agent must be discharged through exterior louvers or from underneath.
Engine fires are fueled by oils/fluids and constrained by the compartment enclosure; preserving the hood barrier prevents rapid fire expansion.
2
Determine the extinguishing requirements for smoldering rubber dual-tires.
Identify tire rubber as a solid combustible (Class A) that holds deep thermal energy, necessitating copious water cooling.
Dry chemical alone often fails on tire fires because deep smoldering inside the thick tire carcass re-ignites once chemical vapor dissipates.
3
Evaluate the cab instrument panel electrical arcing scenario.
Identify the electrical current risk (Class C) requiring power disconnection and non-conductive dry chemical discharge.
Water or conductive substances cause immediate shock risks and further circuit destruction.
4
Select the proper tactical approach for the diesel pool fire on the ground.
Identify Class B flammable liquid behavior requiring upwind positioning and sweeping the base of the flames with B:C dry chemical.
Aiming above the base or into the center of liquid spreads burning fuel; sweeping the base smothers vapor release across the liquid surface.

Anahtar Kavram

Commercial Motor Vehicle Fire Suppression Tactics and Extinguisher Application
Tahmini Süre:1m 30s
Bu soruyu puanla

Konular

Fires and Fire Extinguisher Use

Bu konudan daha fazla soru