Module 3.1 Knowledge Questions Flashcards

1
Q

A vitiated air supply will produce carbon monoxide when the combustion of natural gas takes place within a space heater. What is vitiated air?

Answer: ………………

A

Air which has a lack of oxxygen

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2
Q

When completing a combustion analysis procedure to detect any presence of CO, over how long a period should the level of CO be monitored?

a 5 minutes
b 10 minutes
c 15 minutes
d 20 minutes

A

c 15 minutes

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3
Q

Which of the following is the minimum concentration of carbon monoxide within the air that will cause occupants to fall victim to coma within a few minutes?

a 0.05%.
b 0.4%.
c 0.8%.
d 1.0%.

A

b 0.4%.

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4
Q

What is the approximate volume of air required to completely burn 5m3 of natural gas?

a 15m3.
n 25m3.
c 50m3.
d 100m3.

A

c 50m3.

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5
Q

What is the approximate quantity of primary air that will be entrained by a pre-aerated flame?
a 25%.
b 50%.
c 75%.
d 100%.

A

b 50%.

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6
Q

Which type of flame is luminous and ragged in shape, when working correctly?

Answer…….

A

Post-aerated flame

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7
Q

Which of the following percentages of gas in air will not support the combustion of natural gas?

a 6% gas in air.
b 10% gas in air.
c 14% gas in air.
d 20% gas in air.

A

c 20% gas in air.

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8
Q

CO tests on appliances other than gas cookers should be stopped and the area immediately ventilated and vacated it the CO reading exceeds:

a 10ppm
b 15ppm
c 20ppm
d 30ppm

A

d 30ppm

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9
Q

Flame impingement can cause the production of carbon monoxide during combustion of natural gas. Flame impingement can be caused by:

a Incorrect positioning of a burner.
b Inadequate ventilation air.
c Excessive ventilation air.
d Reduced burner pressure.

A

a Incorrect positioning of a burner.

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10
Q

What is likely to be the consequence of blocked air inlet grills of an open flued appliance?

Answer…………

A

Incomplete combustion

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11
Q

The main constituent of natural gas is the hydrocarbon gas methane. Which of the following is a hydrocarbon fuel?

a Carbon Monoxide.
b Carbon Dioxide.
c Butane.
d Nitrogen.

A

c Butane.

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