Q1) WHAT IS FIRE?
ANS) FIRE IS THE VISIBLE PROCESS OF CHEMICAL REACTION
(COMBUSTION REACTION) BETWEEN OXYGEN IN THE AIR AND ANY COMBUSTIBLE MATERIAL
(FUEL) RELEASING HEAT.
Q2) WHAT ARE THE ELEMENTS INVOLVED IN FIRE?
ANS) THEY ARE THREE
ELEMENTS INVOLVED IN FIRE
• SOLID
LIQUID OR GAS COMBUSTIBLE MATERIAL ALSO CALLED FUEL,
• OXYGEN
TAKEN FROM SURROUNDING AIR,
• HEAT
Q3) WHAT IS FIRE TRIANGLE?
ANS) THEY ARE THREE
ELEMENTS INVOLVED IN FIRE
• SOLID
LIQUID OR GAS COMBUSTIBLE MATERIAL ALSO CALLED FUEL,
• OXYGEN
TAKEN FROM SURROUNDING AIR,
• HEAT
THESE THREE ELEMENTS ARE CALLED FIRE TRIANGLE, WHICH ARE
REPRESENTED AT THE SIDES OF TRIANGLE
Q4) WHAT IS DIFFERENCE BETWEEN STARTING OF FIRE AND
PROPAGATION OF FIRE?
ANS) 1 ) FIRE STARTS
WHEN HEAT ENERGY IN THE FORM OF IGNITION (SPARK, FLAME) STARTS A CHEMICAL
REACTION BETWEEN OXYGEN IN THE AIR AND COMBUSTIBLE MATERIAL (FUEL).THIS IS CALLED FIRE STARTING
OR FIRE INITIATION.
2)
AFTER FIRE STARTS THE CHEMICAL REACTION BETWEEN OXYGEN AND FUEL GENERATES HEAT,
WHICH PROVIDES THE REQUIRED TEMPERATURE TO CONTINUE REACTION BETWEEN OXYGEN AND
FUEL, THIS IS CALLED FIRE PROPAGATION
Q5) WHAT IS FLASHPOINT AND FIRE POINT?
ANS) 1 ) THE FLASH
POINT IS THE LOWEST TEMPERATURE AT WHICH THE LIQUID GIVES OFF ENOUGH VAPOR TO
FORM IGNITABLE MIXTURE IN AIR, BUT VAPOR FORMED CANNOT SUSTAIN THE FIRE WHEN THE
IGNITION SOURCE IS REMOVED
2) THE
FIRE POINT IS THE LOWEST TEMPERATURE AT THE WHICH THE VAPOR FROM THE LIQUID CAN
CONTINUE TO BURN FOR ATLEAST 5 SECONDS AFTER THE IGNITION HAS STARTED
Q6) WHAT ARE TWO MAIN CLASSES OF VOLATILE LIQUIDS BASED ON
FLASHPOINT?
ANS) THE TWO MAIN CLASSES OF VOLATILE LIQUIDS BASED ON FLASH
POINT ARE FLAMMABLE LIQUIDS AND COMBUSTIBLE LIQUIDS
Q7) WHAT IS DIFFERENCE BETWEEN FLAMMABLE AND COMBUSTIBLE?
ANS) 1) LIQUIDS WHICH HAVE FLASHPOINT OF LESS THAN (140°F)
or (60°C) ARE CALLED FLAMMABLE
2) LIQUIDS
WHICH HAVE FLASHPOINT OF ABOVE (140°F) or (60°C) ARE CALLED COMBUSTIBLE
Q8) WHAT IS DIFFERENCE BETWEEN FLAMMABLE AND COMBUSTIBLE
LIQUIDS?
ANS) 1) LIQUIDS WHICH HAVE FLASHPOINT OF LESS THAN
37.8°(100°F) ARE CALLED FLAMMABLE
2) LIQUIDS
WHICH HAVE FLASHPOINT OF ABOVE 37.8°(100°F) ARE CALLED COMBUSTIBLE
Q9) WHAT IS DIFFERENCE BETWEEN DEFLAGRATION AND DETONATION?
ANS) 1) A SURFACE PHENOMENON OF RAPID AUTO COMBUSTION OF
PARTICLES RESULTING IN A SHOCK WAVE MOVING AT A SPEED LESS THAN SOUND IS KNOWN
AS DEFLAGRATION.
2) A RAPID, SELF PROPAGATING, DECOMPOSITION OF AN EXPLOSIVE RESULTING IN A HIGH TEMPERATURE – PRESSURE SHOCK WAVE MOVING AT
A SPEED MORE THAN THE SPEED OF SOUND IS CALLED DETONATION
Q10) WHAT IS DIFFERENCE BETWEEN FIRE AND EXPLOSION?
ANS) 1) IN EXPLOSION THE HEAT ENERGY IS RELEASED AT A VERY
FAST RATE DURING COMBUSTION PROCESS INVOLVING THE LIBERATION AND EXPANSION OF
LARGE VOLUME OF GAS.
2) IN FIRE THE HEAT ENERGY IS RELEASED AT A VERY SLOW RATE
DURING COMBUSTION PROCESS
Q11) WHAT IS MEANT BY SMOTHERING, COOLING, STARVATION IN
STOPPING FIRE?
ANS) 1) SMOTHERING
- CUTTING OFF OXYGEN SUPPLY TO FIRE.
2) COOLING - REMOVAL OF HEAT FROM THE BURNING
SUBSTANCE.
3) STARVATION – REMOVAL OF FUEL FROM TEH
BURNING SUBSTANCE.
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