Domestic Gas Combustion Workbook

The only way for an engineer to confirm if burner combustion is producing excessive amounts of Carbon Monoxide is to?

• Make contact with the manufacturer's technical department.

• Analyse the products of combustion.

• Return the following day and complete a visual check.

• Interrogate the customer on the appliance history.

What is the most common cause of incomplete combustion of an open flued appliance?

• The primary air ports become blocked due to a build-up of lint, fibres, etc.

• The secondary air ports become blocked due to a build-up of lint, fibres, etc.

• The burner injector becomes enlarged.

• The burner is damaged due to corrosion or heat stress.

An obvious sign of incomplete combustion on an open flue, central heating boiler is?

• Explosive ignition.

• Yellow flames at the burner.

• Carbon monoxide alarm activating.

• Signs of spillage at the draught diverter.

The process of stoichiometric combustion is shown in which of the following chemical equations?

• CH4 + 2O2 → CO2 + 2H2O.

• 2CH4 + 3O2 → 2CO + 4H2O.

• CH4 + O2 → C + 2H2O.

• 2CH4 + 5O2 → 2CO2 + 4H2O + O2.

Air is generally taken to consist of?

• 20 % nitrogen and 80 % oxygen.

• 20.9 % oxygen and 79.1 % nitrogen.

• 20.9 % nitrogen and 79.1 % oxygen.

• 20 % oxygen and 80 % nitrogen.

Battery and mains powered carbon monoxide detectors are now manufactured to?

• BS EN 50291.

• BS 7860.

• BS 5440 -1.

• BS 5440 -2.

If CO poisoning is suspected, any person affected must be?

• Given medical advice over the phone from NHS direct.

• Removed from any room containing a gas appliance and relocated to another room.

• Advised that gas appliances should be serviced as soon as possible.

• Removed from the contaminated area and relocated to the open air immediately.

What level of CO should cause a carbon monoxide detector to alarm within 3 minutes?

• 35 ppm.

• 50 ppm.

• 100 ppm.

• 300 ppm.

What type of sensor(s) is/are fitted within a typical portable, flue gas analyser?

• Carbon dioxide and oxygen.

• Carbon monoxide.

• Oxygen.

• Carbon monoxide and oxygen.

Carbon monoxide detectors can be affected by temperatures?

• Below 4.4 °C or above than 37.8 °C.

• Below 37.8 °C or above than 40 °C.

• Below 4.4 °C or above than 100 °C.

• Below 4.4 °F or above than 37.8 °F.