OFTEC Combustion Efficiency Testing 2

Question 1

What is the minimum acceptable combustion efficiency for a new oil-fired boiler at commissioning?

Accepted Answer

85%

Answer

70%

Answer

60%

Answer

95%

Question 2

What does excess air in combustion mean for boiler efficiency?

Accepted Answer

It reduces efficiency as heat is wasted heating unused air that goes up the flue

Answer

It increases efficiency by providing more oxygen

Answer

It has no effect on efficiency

Answer

It improves safety but has no efficiency impact

Question 3

What is the correct position to take a flue gas sample from an oil-fired appliance?

Accepted Answer

In the flue pipe, at the test point closest to the appliance outlet

Answer

At the top of the chimney

Answer

In the combustion chamber

Answer

At the oil tank

Question 4

How long should an oil burner run before taking combustion readings?

Accepted Answer

At least 10-15 minutes to reach stable operating conditions

Answer

Immediately after ignition

Answer

At least 2 hours

Answer

Only when the burner is cold

Question 5

What does a high oxygen (O2) reading in the flue gas indicate?

Accepted Answer

Too much excess air is entering the combustion process

Answer

The fuel supply is too high

Answer

The flue is blocked

Answer

The burner is operating perfectly

Question 6

What is the relationship between CO2 and O2 readings in flue gas analysis?

Accepted Answer

As CO2 increases, O2 decreases (they are inversely related)

Answer

Both increase together

Answer

Both decrease together

Answer

There is no relationship between them