WorksheetsPhase4Mod11devices
Total questions: 10
Worksheet time: 5mins
Which of the following flame supervision devices senses the presence of the flame not the presence of heat?
Thermo-electric.
Bi-metallic.
Liquid expansion.
Rectification.
A vitiation sensing device works on the principle of:
A flame cooling in a vitiated atmosphere.
A flame lifting in a vitiated atmosphere.
A flame lighting in a vitiated atmosphere.
A flame extinguishing in a vitiated atmosphere.
The flame supervision device fitted to a gas fire must close upon flame failure within a minimum time period of:
1 minute
2 minute
3 minute
4 minute
What type of lubricant should be used when serving gas taps?
Molybdenum desulphated grease
High temperature silicone grease.
Carb-hydroxy grease.
Low-modulus fungicidal silicone grease.
Which of the following flame supervision devices is generally the slowest acting?
Thermo-electric.
Bi-metallic.
liquid expansion.
Rectification.
What is the likely fault if a cooker oven burner extinguished after a period of approximately 15 minutes?
Faulty flame supervision device.
Blocked oven injectors.
Blocked oven thermostat by-Pass.
Under gassing causing incomplete combustion.
To assess the effectiveness of a thermo-electric FSD, the operative should extinguish the flame:
And listen for the click of the valve.
And listen for the click of the valve and verify the valve has closed using a pressure gauge.
And wait for the appliance governor to lock up.
And calculate the gas rate.
A solenoid is used to actuate the gas flow by using.
A low pressure supply.
An electric current.
A thermo electric FSD.
A high pressure supply.
Which is the most common type of flame supervision device is fitted to domestic cooker ovens?
Thermo-electric.
Bi-metallic.
Liquid expansion.
Rectification.
A thermocouple will produce an electro-motive force when the tip is in a flame. If in good condition , the range for common thermocouples is/
5-15mV.
10-20mV.
15-30mV.
20-40mV.
