OFTEC Oil Burner Types and Operation 3

Question 1

What is the role of the pre-heater in an oil burner using gas oil (Class D fuel)?

Accepted Answer

To warm the oil to reduce its viscosity for proper atomisation

Answer

To heat the combustion air

Answer

To warm the boiler water before ignition

Answer

To prevent the flue from cooling down

Question 2

What is the standard nozzle flow rate unit used for oil burner nozzles in the UK?

Accepted Answer

US gallons per hour (USgph)

Answer

Litres per minute

Answer

Cubic metres per hour

Answer

Kilograms per second

Question 3

What safety device prevents the oil pump from building excessive pressure?

Accepted Answer

A pressure relief valve that returns excess oil to the suction side

Answer

The photocell

Answer

The lockout switch

Answer

The thermostat

Question 4

In a two-pipe oil supply system, what is the purpose of the return pipe?

Accepted Answer

To carry unused oil back to the tank, aiding in de-aeration

Answer

To supply a second burner

Answer

To act as an overflow from the filter

Answer

To provide ventilation to the oil tank

Question 5

What is the maximum recommended length for a single-pipe oil supply to a burner?

Accepted Answer

5 metres with a maximum lift of 3 metres

Answer

20 metres with a maximum lift of 10 metres

Answer

50 metres with no lift restriction

Answer

No limit as long as the pipe is copper

Question 6

What material is the oil supply line between the tank and burner typically made from?

Accepted Answer

10mm copper or steel

Answer

Plastic (PVC) pipe

Answer

Rubber hose

Answer

Cast iron