FIRE ENGINEERING SCIENCE

Question 1

What is 245 million expressed in standard form?

Answer 1

2.45 x 108

Question 2

DEFINITION OF STANDARD FORM

Answer 2

A general term meaning “written down in the way most commonly accepted”

Question 3

What is the volume of a sphere which has a diameter of 10m (metres)? Answer expressed in cubic metres.

Answer 3

523.6m3

Question 4

If a gas within a container is heated to four times its original temperature, what effect will that rise in temperature have on the pressure of the gas?

Answer 4

b) The pressure of the gas will increase fourfold

Question 5

Which of the formulae below is correct for calculating the Jet Reaction (R) of a nozzle, when pressure is expressed in bars and diameter in millimetres?

Answer 5

a) R = 1.57 Pd 2 Newtons

10

Question 6

What is the Water Power (WP) of a pump delivering 2,300 litres of water per minute at a pressure of 6 bars? (Answer expressed in Kilowatts.)

Answer 6

23 kW

Question 7

Nozzle

Answer 7

To convert pressure Energy into Velocity or Kinetic energy, To provide an efficient jet.

Question 8

Nozzle Criteria when selecting for firefighting

Answer 8

Flowrates available,
Penetrating power
Height of Jet needed
Length of line needed
Cone or Jet, 
Size of the fire

Question 9

Nozzle Functions

Answer 9

Control the rate of flow, 
Speed, 
Distance, 
Mass, 
Shape of the jet that emerges from them.

Question 10

Factors of supply that will affect the maximum height of a firefighting jet

Answer 10

Pressure, 
Flowrate, 
Hose Diameter
Nozzle type, 
Nozzle diameter