Question

Which of the following is an excellent fuel?
(a).Solid Fuel
(b).Liquid Fuel
(c).Gaseous Fuel
(d).None of the above

Answer 1

Hint: A fuel is deemed good or desirable when it has a low ignition temperature and generates a significant amount of heat. It represents it high in its calorific value. Ideal fuels should be easy to store, leave behind ash after they are burned and quickly combust. They are inexpensive, readily available and do not create any harmful smell.
Complete Step by Step Answer:
Out of three different types of fuels, the gaseous fuel is excellent because it is easier to handle than solid and liquid fuels.
It is easily transported through pipelines. They do not leave a residue after burning.
Gaseous fuels produce low smoke and have high calorific value, they have relatively low ignition temperature and produce more heat.

Hence, option C is correct.

Additional information:
Fuel gas is any of a variety of fuels which are gaseous under ordinary conditions. Many fuel gases are made up of hydrocarbons (such as gasoline, biogas or propane), hydrogen, carbon monoxide or its mixtures. Such gases are sources of potential heat or light energy, which can be transferred and distributed directly through pipes from the point of origin to the place of consumption.

Solid fuel refers to different types of solid material which can be burned to release steam, providing heat and light through the combustion process. Popular examples of solid fuels include wood, charcoal, peat, coal, hexamine fuel tablets, wood pellets, corn, wheat, rye, etc.
Most liquid fuels are derived from fossil fuels in widespread use; however, there are several varieties, such as hydrogen fuel (for auto fuel) , ethanol, and biodiesel, which are also categorized as a liquid fuel.

Note:
-A known downside of solid fuels is this type of fuel having high ash content. While using solid gas you may need to do more cleaning. Also, it is known to flame which produces lower thermal efficiency in clinker formation.
-Liquid fuels can cost considerably more than solid forms. It is also more expensive to store, and also poses a certain number of hazards during storage or when misused.