Few combustion questions ?

[Mr_Hickey]

I'm really stuck, searched google and looked throughout the corgi book

1. What level of CO2 in a room could critically affect combustion of a gas-fired asppliance
a - 100ppm
b - 300ppm
c - 1000ppm (My answer)
d - 15000ppm

2.CO can migrate in which of the following ways
a - upward via a stairwell
b - downward if thermal conditions outside the source room promote mixing
c -through roof space
d - all of the above (My answer)

3. The max permitted co figure specified by the WHO in a room may be exceeded
a - if there is no has-fired appliances
b - if the gas fired appliance is on
c - for short term use of flueless appliances such as cookers
d - the room in which the appliance is located is adequately ventilated (My answers)

 

[kirkgas]

I would say
a
d
c ( my reasoning comes from the training notes for CPA which gives levels for testing a cooker which are a lot higher than the 10ppm for rooms)

 

[gassafe]

I would say
a
d
c ( my reasoning comes from the training notes for CPA which gives levels for testing a cooker which are a lot higher than the 10ppm for rooms)

Same

 

[Ermintrude]

B as most boilers will chug out at 300ppm for short duration? If it's an open flue or flue less 100ppm could be 3 smokers and poor vent?

d
c

Reading own answer first one probably A

 

[plumbdoctor]

Thought co2 was measured as a percentage ? If you mean co most m.i's except levels up to 200ppm if the co2 is correct on new boilers

 

[AWheating]

i agree with the guy who teaches this stuff.