Question

Wobbe Index is a characteristic of ____________.

• A. Solid fuels
• B. Gaseous fuels
• C. Liquid fuels
• D. Fat coals

Answer 1

The correct option is B

Gaseous fuels

The explanation for the correct option:

(B) Gaseous fuels.

• Wobbe Index is a characteristic of gaseous fuels.
• The Wobbe Index, often known as the Wobbe number, is a measure of interchangeability of fuel gases such as natural gas, liquefied petroleum gas, and town gas.
• The formula for the Wobbe index is ${\mathrm{I}}_{\mathrm{W}}=\frac{{\mathrm{V}}_{\mathrm{C}}}{\left(\sqrt{{\mathrm{G}}_{\mathrm{S}}}\right)}$
• where ${\mathrm{I}}_{\mathrm{W}}$ is the Wobbe index, ${\mathrm{V}}_{\mathrm{C}}$ is the HHV value for the fuel and ${\mathrm{G}}_{\mathrm{S}}$ is its specific gravity.
• Eg: Pure methane has a Wobbe number of $1363$. So, this is the correct option.

The explanation for the incorrect options:

(A) Solid fuels.

• Wobbe index is applicable for gaseous fuel not for solid fuels.

(C) Liquid fuels.

• Wobbe index is applicable for gaseous fuel not for liquid fuels.

(D) Fat coal

• Fat coals are coals where it having high volatile nature.

Therefore, the correct option is (B), Gaseous fuel.