Reference no: EM131180722

Question 1. Which of the following is NOT an outcome associated with a well-ventilated or fuel-controlled enclosure fire?

Slow progression to full-room involvement.

Fast transition to full-room involvement (flashover).

Smoldering fire with plentiful fuel left to consume in the compartment.

No full-room involvement due to fuel exhaustion.

Question 2. In the bathtub analogy, what is represented by the overflow of the tub?

Flashover

Backdraft

Spread of buoyant gases into adjacent compartments or outside

Flameover

Question 3. In 2007, what percentage of civilian fire deaths was attributed to fires inside residential structures?

34%

50%

80%

Less than 5%

Question 4. The neutral plane is the:

Area where hot gases have gathered under a horizontal surface.

Point along the ventilation opening where no flow occurs due to equality of internal and external pressures.

Point along the ventilation opening where outflow occurs due to inequality of internal and external pressures.

Point along the ventilation opening where inflow of fresh air occurs due to inequality of internal and external pressures.

Question 5. A flame size of __________ is often recognized as established burning for most residential and commercial structures.

20 kW

2 kW

100 kW

150 kW

Question 6. Which method of heat spread is the driving force behind flashover?

Radiation

Convection

Conduction

Atmospheric pressure

Question 7. Which of the following calculations is used in solving Thomas's flashover correlation to determine the HHR need for flashover to occur?

with dot on top subscript F O end subscript equal 7.8 A subscript T plus 376 A subscript v square root of h subscript v end root

with dot on top subscript F O end subcript equal 750 A subscript v square root of h subscript v end root

With dot on top subscript F O end subscript equal 610 square root of h subscript k A subscript T A subscript v square root of h subscript v end root end root

with dot on subscript F O end subscript equal 780 square root of h subscript k A subscript T A subscript v square root of h subscript v end root end

Question 8. What is the primary risk of utilizing a PPV fan in a compartment fire?

The presence of wind could cause the fire to rapidly build up and lead to a large fire or combustion at explosive speed.

Introduction of air could cause the fire to rapidly build up and lead to a large fire or combustion at explosive speed.

PPV fans are not of any use in firefighting activities.

Air flow into the compartment will be severely hampered, and any victims will suffocate.

Question 9. Which of the following is NOT a nontechnical indicator of a flashover event?

Explosive forces which remove window frames.

The fire "exploding" within the compartment.

The breaking of external windows.

Flame extension escaping the compartment doors or windows.

Question 10. What is full-room involvement?

A rapidly occurring transitional event in the development of a compartment fire.

The condition where unburned fuel (pyrolyzate) from the originating fire has accumulated in the ceiling layer to a sufficient concentration that it ignites and burns.

The ignition of unburned pyrolyzates, due to sudden influx of air which ignites and results in an extremely rapid burning of gases/pyrolysis products being forced out through the opening.

A condition in a compartment fire in which the entire volume is involved in fire.

Question 11. A moderate t2 fire breaks out in a 10 feet wide, 12 feet long, and 9 feet high room lined with ¾" gypsum wallboard. The 3 feet wide and 7 feet high door into the room is wide open. Determine the minimum heat release rate needed to cause flashover and the corresponding time after ignition to reach flashover using (a) Thomas Method, (b) Babrauskas Method, and (c) MQH Method. How do you explain the different heat release rates and times to flashover between the methods?

Your answer should show six calculations and your answers must include the proper units.