080103 Properties of Gas and Principles of Combustion

Question 1

What are the two factors that influence the state in which matter exists?

Answer 1

Temperature and Pressure

Question 2

What is standard atmospheric pressure?

Answer 2

14.7 psia

Question 3

When pressure increases what happens to boiling temperature?

Answer 3

It increases

Question 4

What is standard temperature?

Answer 4

60°F

Question 5

What are the calorific values of methane and propane?

Answer 5

Methane = 1000 BTU/cubic foot
Propane = 2500 BTU/cubic foot

Question 6

What are the specific heat values of water, steam and ice?

Answer 6

Water = 1
Steam = 0.5
Ice = 0.5

Question 7

How much does 1 imperial gallon of water weigh?

Answer 7

10lbs

Question 8

Efficiency equation?

Answer 8

Output / Input = Efficiency

Question 9

The hottest part of a gas flame is…

Answer 9

The tip of the inner cone

Question 10

Range of flammability air/gas mixture is approximately…

Answer 10

20% oxygen, 80% nitrogen

Question 11

What is it called when an air/gas mixture moves forward more slowly than the the speed the flame moves back?

Answer 11

Flashback

Question 12

What is it called when the air/gas mixture moves forward faster than the flame speed moves backwards?

Answer 12

Lift off

Question 13

What % of oxygen does 1 cubic foot of air contain?

Answer 13

20%

Question 14

What does a reduced (lazy) yellow flame indicate?

Answer 14

Not enough primary air to the burner

Question 15

How many cubic feet of primary air are required to light 1 cubic foot of natural gas?

Answer 15

10

Question 16

How many cubic feet of primary air are required to light 1 cubic foot of propane?

Answer 16

24

Question 17

Define Charles Law

Answer 17

Increase in temperature = increase in volume

Question 18

Define Boyls Law

Answer 18

Increase in pressure = decrease in volume

Question 19

How does heat travel?

Answer 19

Hot to cold

Question 20

Define temperature

Answer 20

Molecular movement

Question 21

Define heat

Answer 21

Energy that transfers from one body to another

Question 22

At what temperature is water most dense?

Answer 22

4°C

Question 23

A 70°F change is equal to what temperature change in Celsius?

Answer 23

70° / 1.8 = 38.88°C

Question 24

A 100°C change is equal to what temperature change in Fahrenheit?

Answer 24

100° x 1.8 =180°F

Question 25

Fahrenheit to Celsius conversion formula

Answer 25

°C = (°F - 32°F) / 1.8

Question 26

Celsius to Fahrenheit conversion formula?

Answer 26

°F = (1.8 x °C) + 32

Question 27

Define specific heat capacity

Answer 27

The quantity of heat required to change the temperature of one unit of mass by one degree

Question 28

Define latent heat

Answer 28

Heat that causes a change of state not temperature

Question 29

Define sensible heat

Answer 29

Heat that causes a change in temperature only, but not in state

Question 30

Equation for calculating sensible heat?

Answer 30

Sensible heat = specific heat capacity x mass x temperature change

Question 31

What are the latent heat values for ice-water and water-steam?

Answer 31

Ice-Water = 144 BTUs/lb 335 KJ/kg

Water-Steam = 970 BTUs/lb 2257 KJ/kg

Question 32

Latent heat calculations formula?

Answer 32

Latent heat = mass x latent heat value

Question 33

How many BTU are in 1 cubic foot of natural gas?

Answer 33

1000

Question 34

What are the liquefaction ratios of propane?

Answer 34

270 cubic feet/cubic foot (liquid)

43.6 Cubic Foot/Gallon (Vapour)

Question 35

What’s are the specific gravity (or relative density) of CH4 and C3H8?

Answer 35

CH4 = 0.6
C3H8 = 1.5

Question 36

Calculate the amount of energy required to change 315L of water @ 12°C into steam @ 110°C

Answer 36

833,679 KJ

Question 37

The boiling point of liquid propane at STP is:

Answer 37

-44°F(-42°C)

Question 38

How many BTU are contained in 5 imperial gallons of propane?

Answer 38

547800

Question 39

The range of flammability for CH4 and C3H8 is?

Answer 39

CH4 = 5-15%

C3H8 = 2.3-9.5%

Question 40

How much would 10 imperial gallons of propane liquid weigh?

Answer 40

51 lbs

Question 41

When C3H8 changes state from liquid to gas it will expand how many times?

Answer 41

270