Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
What is the unit of measure for the calorific value of fuels?
kJ/kg
J/m
cal/g
W/kg
kJ/kg
The calorific value of a fuel is defined as the amount of heat energy produced by the complete combustion of one kilogram of a fuel. The SI unit for this value is kilojoules per kilogram (kJ/kg), representing the energy content available per unit mass.
The calorific value of a fuel is defined as the amount of heat energy produced by the complete combustion of one kilogram of a fuel. The SI unit for this value is kilojoules per kilogram (kJ/kg), representing the energy content available per unit mass.
This concept relates to the First Law of Thermodynamics, which states that energy cannot be created or destroyed, only transferred from fuel chemical energy into thermal energy.
Calorific value measures the efficiency of a fuel.
Hydrogen has the highest calorific value among all fuels, approximately 150,000 kJ/kg.
Cow dung cake has a very low calorific value, ranging from 6,000 to 8,000 kJ/kg.
Calorific value is inversely proportional to the pollution potential of the fuel.
Calorific value is also known as the heating value or energy value of a substance.
Higher calorific values indicate that the fuel is more energy-dense, requiring less mass to perform the same amount of work.
Option B (J/m) measures linear energy density, Option C (cal/g) is a CGS unit but less standard for large-scale industrial fuel comparisons, and Option D (W/kg) measures specific power, which relates to the rate of energy release rather than total potential energy.
Wood, coal, and LPG have calorific values of roughly 17,000-22,000 kJ/kg, 25,000-33,000 kJ/kg, and 55,000 kJ/kg respectively.
A is correct тАФ The standard SI unit for expressing the calorific value of fuels is kJ/kg.
When studying chemistry for competitive exams, differentiate between Calorific Value (Energy per unit mass) and Octane/Cetane ratings (Quality metrics for gasoline and diesel combustion).
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants