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Characteristics of combustion

Authored by Robert Aitken

Engineering

2nd Grade

Used 1+ times

Characteristics of combustion
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22 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

the primary ports become blocked with a build up of lint, fibres

the secondary ports become blocked due to lint, fibres etc

the burner injector becomes enlarged

the burner is damaged due to corrosion or heat stress

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

An obvious sign of incomplete combustion of an open flued central heating boiler is

explosive ignition

yellow flames at the burner

carbon monoxide alarm activating

signs of spillage at the draught diverter

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The process of stoichiometric combustion is shown in which following chemical equation

CH4+2O2 = CO2+2H2O

2CH4+3O2 = 2CO+4H2O

CH4+O2 = C+2H2O

2CH4+5O2=2CO2 +4H2O

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

In reality oxygen is not supplied neat, but is supplied by the provision of air. 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

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Battery and mains powered carbon monoxide detectors are now manufactured to which standard

BS 7860

BS 5440-1

BS EN 50291

BS 5440-2

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

If CO poisoning is suspected, any person affected must be

Given medical advice over the phone

removed from any room containing a gas appliance and relocated to another room

advised that gas appliances should be serviced immediately

removed from the area and relocated to the open air immediately

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

what level of CO could cause a carbon monoxide alarm to go off within 3 minutes

35 ppm

50ppm

100ppm

300ppm

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