102K Properties of Gas & Principles of Combustion

Question 1

Methane

Answer 1

CH4

Question 2

Propane

Answer 2

C3H8

Question 3

Matter can exist in 4 states:

Answer 3

1. Solids (definite shape, volume, weight)
2. Liquids (definite volume & weight, no shape)
3. Vapour (definite weight, no shape & volume)
4. Plasma

Question 4

2 factors influence the state in which matter exists:

Answer 4

1. Temperature
2. Pressure

Question 5

Propane (Boiling point)
Methane (Boiling point)

Answer 5

-44F
-258F

Question 6

Propane (Specific Gravity)
Methane (Specific Gravity)

Answer 6

1.5 -> heavier than air
0.6

Question 7

Propane (Liquefaction ratio)
Methane (Liquefaction ratio)

Answer 7

270 cuft/cuft
43.6 cuft/cuft

Question 8

Propane (Btu/cuft³)
Methane (Btu/cuft³)

Answer 8

2500 Btu/cuft³
1000 Btu/cuft³

Question 9

Density

Answer 9

The relationship between the volume and the weight of a substance

Question 10

BTU =

Answer 10

Weight of water x specific heat x temperature rise

Question 11

Specific heat of water
Specific heat of vapour
Specific heat of ice

Answer 11

1.0
0.46
0.5

Question 12

Appliance Efficiency =

Answer 12

Output of the appliance/Input of the appliance

Question 13

Propane (Ignition temperature)
Methane (Ignition temperature)

Answer 13

950F
1200F

Question 14

Propane (Maximum flame temperature)
Methane (Maximum flame temperature)

Answer 14

3500F
3350F

Question 15

Propane (Flame speed)
Methane (Flame speed)

Answer 15

32 in/sec
26 in/sec

Question 16

Propane (Limits of flammability)
Methane (Limits of flammability)

Answer 16

2.3 ~ 9.5%
5 ~ 15%

Question 17

Propane (Combustion air required)
Methane (Combustion air required)

Answer 17

24 ft³ of air/ft³ of gas
10 ft³ of air/ft³ of gas

Question 18

3 main gases present in the atmosphere

Answer 18

1. Oxygen 20%
2. Nitrogen 79%
3. Other gases 1%

Question 19

3 components required for combustion?

Answer 19

1. Fuel
2. Heat (Ignition)
3. Oxygen (Air)

Question 20

Excess air is how much of the total air?

Answer 20

40%

Question 21

Good combustion colour

Answer 21

Blue

Question 22

Bad combustion colour (Not enough primary air)

Answer 22

Yellow

Question 23

Dust/dirt passing through the flame colour

Answer 23

Orange

Question 24

Incomplete combustion creates

Answer 24

Carbon Monoxide, Aledehydes

Question 25

If liquid propane were to spill in a bucket of water, it would tend to sink below the water.

T or F

Answer 25

False (Liquid propane is lighter than water, heavier than air)