OFTEC Combustion Efficiency Testing

Question 1

What is the primary instrument used to measure combustion efficiency on an oil-fired appliance?

Accepted Answer

Electronic flue gas analyser

Answer

Manometer

Answer

Multimeter

Answer

Thermographic camera

Question 2

What is the recommended CO2 reading for a kerosene pressure jet burner operating correctly?

Accepted Answer

10-12%

Answer

3-5%

Answer

15-18%

Answer

20-25%

Question 3

What is the maximum acceptable CO reading in the undiluted flue gas for an oil-fired appliance?

Accepted Answer

50 ppm

Answer

200 ppm

Answer

500 ppm

Answer

1000 ppm

Question 4

What does a smoke number of 0 on the Bacharach scale indicate?

Accepted Answer

Clean combustion with no visible smoke or soot

Answer

Maximum smoke output

Answer

The test was not performed correctly

Answer

The filter paper was faulty

Question 5

What is the Bacharach smoke test used to measure?

Accepted Answer

The level of soot particles in the flue gases

Answer

The temperature of the flue gases

Answer

The oxygen content of the flue gases

Answer

The draught in the flue

Question 6

Why is it important to measure the flue gas temperature during combustion testing?

Accepted Answer

High flue gas temperature indicates heat is being lost up the flue, reducing efficiency

Answer

It determines the CO content

Answer

It measures the draught

Answer

It indicates the fuel flow rate