Types of Gaseous Fuels

Fuel gases are divided into mainly three types: ______, Manufactured fuel gases, and By-product fuel gases.

Natural gas is not usually pure ______ but would normally contain about 90 parts of methane to 5 or 6 parts of heavier hydrocarbons.

The ______ index is used to compare the combustion energy output of different composition fuel gases in an appliance.

The ______ number of a fuel gas is found by dividing the high heating value of the gas in MJ per standard cubic meter by the square root of its specific gravity with respect to air.

Natural gas is invariably formed along with either ______ or oil and is always found in association with these.

Liquefied Petroleum gas is an example of ______ fuel gases.

In a simple gas producer, dry air is blown through a bed of ______ of sufficiently high temperature.

The gas obtained from a simple gas producer consists of ______ and N2 in the ratio of 1:2 by volume.

If coal is used in a simple gas producer, the gas contains additional ______ and methane derived from the volatile matter of the coal.

The reaction of steam with carbon generates additional combustible gas by the reaction ______ + H2O → CO + H2.

High volatile ______ coal gives a richer gas, containing small proportions of methane.

Water gas is prepared by the action of superheated steam on a bed of hot ______ at about 1000oC.