Notes on Important Fuels and their Composition PDF – SSC & Railway Exams

Notes-on-Important-Fuels-and-their-Composition

Overview: Notes on Important Fuels and their Composition

Competitive exams me Chemistry aur Applied Science ke andar Fuels and their Chemical Compositions ek high-frequency scoring topic hai. RRB NTPC, RRB Group D, SSC CGL aur CHSL me LPG, CNG, Water Gas, Producer Gas, Coal varieties, aur Calorific Values par har saal direct factual questions puche jaate hain.

Key Fuel Types & Chemical Formulas Covered in this PDF

  • Gaseous Fuels: CNG (Methane), LPG (Propane + Butane), Bio-gas, aur Coal Gas ki exact chemical composition.
  • Synthetic Industrial Gases: Water Gas (CO + H2) aur Producer Gas (CO + N2) ki manufacturing reactions.
  • Solid Fuels & Coal Varieties: Anthracite, Bituminous, Lignite, aur Peat ke carbon percentage breakdowns.
  • Fuel Efficiency & Calorific Value: Hydrogen ki highest calorific value aur environmental impact analysis.

PDF Material Details

AttributeSpecification Details
Topic NameNotes on Important Fuels and their Composition
CategoryGeneral Science — Applied Chemistry & Energy
LanguageEnglish / Hindi Mix (Aspirant Friendly)
Target ExamsRRB NTPC, SSC CGL, SSC CHSL, RRB JE, State PSCs
Core FocusGaseous Fuels, Coal Types, Calorific Value Chart & Odorant Chemicals

Practice MCQs on Fuels & Chemical Compositions

Exam readiness check karne ke liye niche diye gaye 15 high-yield MCQs solve karein:

Q1. What is the primary constituent gas of Compressed Natural Gas (CNG)?

Check Answer

Answer: Methane (CH4 ~ 85-95%).

Q2. What are the main components of Liquefied Petroleum Gas (LPG)?

Check Answer

Answer: Propane (C3H8) and Butane (C4H10), with Butane being the major constituent.

Q3. Which strong-smelling substance is added to LPG cylinders to detect gas leakages?

Check Answer

Answer: Ethyl Mercaptan (Ethanethiol – C2H5SH).

Q4. Water Gas is a mixture of which two gases?

Check Answer

Answer: Carbon Monoxide (CO) and Hydrogen (H2) [Ratio 1:1].

Q5. Producer Gas consists mainly of:

Check Answer

Answer: Carbon Monoxide (CO) and Nitrogen (N2).

Q6. Which variety of coal is considered the highest grade with the highest carbon content?

Check Answer

Answer: Anthracite Coal (contains 85-95% Carbon, burns with a smokeless blue flame).

Q7. Which fuel has the highest calorific value among all known fuels?

Check Answer

Answer: Hydrogen Gas (~150,000 kJ/kg), making it ideal as rocket fuel.

Q8. What is the major constituent gas in Gobar Gas (Bio-gas)?

Check Answer

Answer: Methane (CH4 ~ 55-70%), along with Carbon Dioxide (CO2).

Q9. Which type of coal is commonly called “Brown Coal”?

Check Answer

Answer: Lignite (contains ~40-55% Carbon and high moisture content).

Q10. Coal gas is a mixture of which main gases?

Check Answer

Answer: Hydrogen (H2), Methane (CH4), and Carbon Monoxide (CO).

Q11. The anti-knocking quality of petrol (gasoline) is measured by its:

Check Answer

Answer: Octane Number (whereas Diesel fuel quality is measured by Cetane Number).

Q12. What chemical compound was historically used as an anti-knocking agent in petrol?

Check Answer

Answer: Tetraethyl Lead [TEL – Pb(C2H5)4].

Q13. What is the first stage in the natural transformation of wood into coal?

Check Answer

Answer: Peat (lowest grade fuel with less than 40% carbon).

Q14. Incomplete combustion of fossil fuels mainly produces which poisonous gas?

Check Answer

Answer: Carbon Monoxide (CO), which strongly binds to hemoglobin in blood.

Q15. Power alcohol is a fuel blend consisting of:

Check Answer

Answer: Approx 80% Petrol and 20% Absolute Ethanol.

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Complete Chemistry Series Parts

Explore all topic-wise notes in our complete Chemistry series:

🔙 Go to Main Series Page (All Parts & Sets) ➔
Part 1: Acids and Bases Notes ➔
Part 2: Alloy And Their Composition ➔
Part 3: Periodic Table & Elements ➔
Part 5: Glass Composition & Types ➔
Part 6: Carbon & Hydrogen Compounds ➔
Part 7: Metals, Non-Metals & Metalloids ➔
Part 8: Atomic Models & Quantum Numbers ➔
Part 9: Chemical Formulas & Names ➔
Part 10: Chemical Bonding Notes ➔
Part 11: Oxidation and Reduction ➔

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FAQs: Notes on Important Fuels and their Composition

Q1: What is the main difference in composition between CNG and LPG?

Ans: CNG is compressed natural gas composed primarily of Methane (CH4), whereas LPG is liquefied petroleum gas composed mainly of Propane (C3H8) and Butane (C4H10).

Q2: What is Water Gas and how is it produced?

Ans: Water Gas is an equimolar mixture of Carbon Monoxide (CO) and Hydrogen (H2) produced by passing steam over red-hot coke at high temperatures (~1000°C).

Q3: Why is Ethyl Mercaptan added to commercial LPG?

Ans: LPG is an odorless gas in its natural state. Ethyl Mercaptan (with its strong pungent odor) is added as an odorant to immediately alert users in case of a gas leak.

Q4: How can I download Fuels and Composition notes PDF for free on SarkariExamPDF?

Ans: Click on the "Click to Get Download Link" button in the download section above, wait for the 10-second timer to complete, and click "Download PDF Now" to access the file via Google Drive.

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