30. Mid Course Exam mock 1

• Mock
• Further Education (Key Stage 5)

Mid Course Exam mock 1

This is a mock test to refresh your memory and to help familiarise yourself with your gas book.

Use the book to find the answers.

What is the explosive range for Natural Gas, when expressed as a percentage of gas in air: -

1. 1.6% to 7.75%
2. 2% to 10%
3. 4% to 40%
4. 5% to 15%

The specific gravity of natural gas is: -

1. 0.6
2. 0.8
3. 1.5
4. 2

The industry unsafe procedure defines an ‘Immediately Dangerous’ situation as: -

1. A danger to life or property.
2. Not complying with current Building Regulations
3. Not complying with current British Standards
4. May be a danger to life or property sometime in the future

Copper compression fittings can only be used on a gas supply in which one of the following situations:

1. Only on vertical runs
2. Only on horizontal runs.
3. Only where they are readily accessible
4. Only where they are under ventilated floors

An approved flexible hose is only permitted for connecting which, of the following appliances to the gas supply: -

1. Radiant gas fire.
2. Single point water heaters
3. Free standing cooker
4. Balanced flue space heater.

The space between sleeves and gas supplies are required to be sealed with which of the following mastic types: -

1. Fire resistant and solid setting
2. Flexible and fire resistant
3. Flexible and flammable.
4. Flammable and solid setting.

Notches cut into joists to run 22mm pipe should not exceed what depth -

1. 1/3 of the depth of the joist
2. 1/4 of the depth of the joist
3. 1/8 of the depth of the joist.
4. 1/10 of the depth of the joist.

The recommended clipping distance, for horizontal runs of 15mm copper tube, is: -

1. 1 metre
2. 1.5 metres.
3. 2 metres.
4. 2.5 metres.

Where a tee is to be installed in to a copper supply adjacent to a meter, which one of the following actions, best describes, what should be carried out: -

1. The installation should be turned off.
2. The installation should be turned off and a temporary continuity bond connected.
3. The installation should be turned off, a temporary continuity bond connected and the meter should then be disconnected and placed to one side
4. The installation should be turned off, a temporary continuity bond connected; the meter should then be disconnected, capped and placed to one side.

Gas supplies that are run through a cavity wall: -

1. Are only permitted if they take the shortest practical route from one side to the other.
2. Are only permitted if they take the shortest practical route from one side to the other and are run through a sealed sleeve.
3. Are only permitted if the cavity is ventilated.
4. Are only permitted if the cavity is filled with a fire retardant insulating material.

The two main products of complete combustion of natural gas are: -

1. Carbon Monoxide and water vapour
2. Methane and Carbon Dioxide.
3. Carbon Dioxide and water vapour
4. Methane and Carbon Monoxide

From the following list what would be the main toxic product of incomplete combustion of Natural Gas: -

1. Hydrogen.
2. Carbon Monoxide.
3. Carbon Dioxide.
4. Nitrogen.

The complete combustion of 1 m³ Natural Gas requires approximately:

1. 4 m³ of air
2. 10m³ of air
3. 15m³ of air
4. 20m³ of air

Ventilation for open flued appliances can not be taken from a room which contains: -

1. An extract fan.
2. An oil or solid fuel appliance
3. A central heating boiler.
4. A bath or shower.

The term adventitious air means: -

1. Air removed by an extract fan.
2. Air entering a room through cracks around doors and openable windows
3. Hot air rising from the appliance casing.
4. Cool air entering the appliance.

The minimum distance ‘X’ between two ridge terminals should be: -

1. 300mm
2. 600mm
3. 1000mm
4. 1500mm

Where two open flue appliances are connected to a single flue, current standards states that the appliances must incorporate a draught diverter and an oxygen depletion device. What other device does current standards also require the appliances to be manufactured with:

1. Thermostat
2. Fan flue.
3. Overheat trip.
4. Flame supervision device.

The lower opening in the ventilation duct in a balanced compartment should be sited: -

1. 100mm above floor level.
2. 200mm above floor level
3. 300mm above floor level.
4. At high level.

The minimum distance, for a natural draught balanced flued terminal, installed vertically above another natural draught balanced flue terminal on the same wall is: -

1. 300mm.
2. 600mm.
3. 1200mm.
4. 1500mm.

A flexible flue liner should not be used: -

1. With a back boiler.
2. Outside of a chimney.
3. When a chimney’s has deteriorated.
4. To prevent damp patches appearing on internal brickwork