Arrange the following in their ascending order of Lower Heating Values (LHV):

(A) Anthracite

(B) Crude oil

(C) Bituminous

(D) Methane

(E) Lignite

Choose the correct answer:

Correct option is D

Introduction

The Lower Heating Value (LHV)of a fuel refers to the amount of heat released during the combustion of a unit amount of the fuel, without accounting for the latent heat of vaporization of water produced during combustion.

Information Booster

Based on the typical values of LHV for the fuels listed:

1. • (E) Lignite: ~15 MJ/kg (Lowest rank of coal, highest moisture content)

   • (C) Bituminous Coal: ~24 – 28 MJ/kg (Intermediate rank of coal)

   • (A) Anthracite: ~26 – 33 MJ/kg (Highest rank of coal, lowest moisture/impurities)

   • (B) Crude Oil: ~42 – 44 MJ/kg (Liquid hydrocarbon, significantly higher energy density than coal)

   • (D) Methane: ~50 MJ/kg (Simple gaseous hydrocarbon, highest energy density by mass among these options)

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   Therefore, the correct sequence from lowest to highest LHV is: Lignite < Bituminous < Anthracite < Crude Oil < Methane.

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