3 Combustion

Question 1

Complete combustion

Answer 1

CH4+2O2+Ignition = HEAT+CO2+2H2O

Question 2

Air required for 1m3

Answer 2

10m3

Question 3

Oxygen required for 1m3

Answer 3

2m3

Question 4

Relative density

Answer 4

0.6

Question 5

Calorific value

Answer 5

38.76 MJ/m3

Question 6

Wobbe number

Answer 6

45.5 to 55.0
CV/ RD/ Injector/ Pressure

Question 7

Gas rate is dependent on (2)

Answer 7

-Supply pressure
-Injector(s)

Question 8

NG Flame speed

Answer 8

0.36 m/s

Question 9

Flammability limits

Answer 9

5 - 15%

Question 10

Ignition temp

Answer 10

704°

Question 11

Types of burner (2)

Answer 11

-Atmospheric
-Force draught

Question 12

Aerated burner (Air)

Answer 12

50 - 50
Primary - Secondary air

Question 13

Stops dust / lint particles

Answer 13

Lint arrester

Question 14

Causes pale pink to bright orange flame picture

Answer 14

Nebuliser

Question 15

Explosion occurrence (3)

Answer 15

-On its own
-Following a fire
-Followed by a fire

Question 16

Gas detector location

Answer 16

Max 5m from appliance
Max 300mm from ceiling

Question 17

CO symptoms (6)

Answer 17

Severe headache, nausea, dizziness, tiredness, general body weakness or cherry red face

Question 18

CO / CO2 Room limits set by World Health Organisation

Answer 18

CO 10PPM
CO2 5000PPM

Question 19

Flue gas BS number

Answer 19

BS EN 50379-3

Question 20

Cooker grill FGA probe

Answer 20

Multi hole

Question 21

Flueless fire FGA probe

Answer 21

Bent multihole

Question 22

FGA probe positioning

Answer 22

200mm into secondary flue

Question 23

26-9 Checks

Answer 23

FAGS

Question 24

Type A Appliance

Answer 24

Flueless

Question 25

Type B Appliance

Answer 25

Open flued

Question 26

Type C Appliance

Answer 26

Room sealed

Question 27

Back boiler ratio with and without fire

Answer 27

0.008 w/o 0.020

Question 28

Boiler ratio

Answer 28

0.004

Question 29

Flueless cooker ratio

Answer 29

0.010 CE marked 0.020 No marking

Question 30

CO alarm BS number

Answer 30

BS EN 50291-1:2018

Question 31

CO alarm location (3)

Answer 31

300mm away from wall 150mm away from ceiling 1-3m from the appliance

Question 32

Perfect combustion

Answer 32

Stoichiometric.

Question 33

1st Gas family

Answer 33

Towns Gas/ manufactured

Question 34

2nd Gas family

Answer 34

Natural gas

Question 35

3rd Gas family

Answer 35

LPG