Question:
Select the incorrect statements:-
A. The liquid fuels consists of hydrocarbons.
B. A bomb calorimeter is used to find low calorific value (LCV) of the fuels.
C. The gaseous fuels do not produce ash or smoke.
D. The solid fuels have higher efficiency than liquid fuels.
Choose the correct answer from the options given below:
Select the incorrect statements:-
A. The liquid fuels consists of hydrocarbons.
B. A bomb calorimeter is used to find low calorific value (LCV) of the fuels.
C. The gaseous fuels do not produce ash or smoke.
D. The solid fuels have higher efficiency than liquid fuels.
Choose the correct answer from the options given below:
A. The liquid fuels consists of hydrocarbons.
B. A bomb calorimeter is used to find low calorific value (LCV) of the fuels.
C. The gaseous fuels do not produce ash or smoke.
D. The solid fuels have higher efficiency than liquid fuels.
Choose the correct answer from the options given below:
Show Hint
Bomb Calorimeter = GCV (Gross/High). To find the LCV (Low/Net), you must subtract the latent heat of condensation of the water formed during combustion.
Updated On: May 20, 2026
- B and D Only
- A and D Only
- B and C Only
- C Only
Show Solution
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The Correct Option is A
Solution and Explanation
Concept:
Fuels are substances that release energy through combustion. Their performance is measured by calorific values and combustion efficiency. Analyzing these properties requires understanding the phase of the fuel and the instrumentation used for measurement.
Step 1: Analyze statements A and C (Correct Statements).
• Statement A: Correct. Most liquid fuels (petrol, diesel, kerosene) are mixtures of various hydrocarbons.
• Statement C: Correct. Gaseous fuels like natural gas or LPG burn cleanly, leaving virtually no solid residue (ash) compared to solid fuels.
Step 2: Analyze statement B (Incorrect).
A bomb calorimeter measures the Gross Calorific Value (GCV) or High Calorific Value (HCV). This is because the water vapor produced during combustion is condensed inside the pressurized vessel, releasing its latent heat. Net Calorific Value (LCV) must be calculated from GCV.
Step 3: Analyze statement D (Incorrect).
Liquid fuels generally have higher combustion efficiency than solid fuels. They provide better mixing with air, have higher calorific values, and lack the significant ash-handling losses associated with solid fuels like coal.
Step 1: Analyze statements A and C (Correct Statements).
• Statement A: Correct. Most liquid fuels (petrol, diesel, kerosene) are mixtures of various hydrocarbons.
• Statement C: Correct. Gaseous fuels like natural gas or LPG burn cleanly, leaving virtually no solid residue (ash) compared to solid fuels.
Step 2: Analyze statement B (Incorrect).
A bomb calorimeter measures the Gross Calorific Value (GCV) or High Calorific Value (HCV). This is because the water vapor produced during combustion is condensed inside the pressurized vessel, releasing its latent heat. Net Calorific Value (LCV) must be calculated from GCV.
Step 3: Analyze statement D (Incorrect).
Liquid fuels generally have higher combustion efficiency than solid fuels. They provide better mixing with air, have higher calorific values, and lack the significant ash-handling losses associated with solid fuels like coal.
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