What is the exam pattern and passing mark for GTU Fuels and Combustion (3150509)?

The GTU theory examination carries 70 total marks with a duration of 2.5 Hours. Minimum passing criteria is 23 marks (33%). The paper consists of 5 main questions with official marking breakdown and internal choices.

Where can I download the official GTU 3150509 Summer 2026 question paper PDF?

The official GTU question paper PDF is linked directly from Gujarat Technological University's official examination archive. You can view the full paper online or download the original file.

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Gujarat Technological UniversitySummer 2026 examination

GTU 3150509 Fuels and Combustion Summer 2026 Question Paper & PDF

B.E. · Chemical Engineering · Semester 5 · Subject code 3150509

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Total: 70 marks
To pass: 23 marks (33%)
Duration: 2.5 Hours 2:30 PM – 5:00 PM
Questions: 5 with internal choice

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Q.1

14 Marks

(a)

3 marks

Define fuel and classify them using block diagram.

(b)

4 marks

Illustrate the stages of coalification with the help of a diagram.

(c)

7 marks

A sample of coal has the following composition by mass: Carbon (C) = 80%, Hydrogen (H) = 5%, Oxygen (O) = 6%, Sulphur (S) = 1%, Ash = 8%. Calculate the Gross Calorific Value (GCV) and Net Calorific Value (NCV) of the coal.

Q.2

14 Marks

(a)

3 marks

Define rank of coal with neat flow chart.

(b)

4 marks

Describe in brief the Float and Sink test for coal washing with neat sketch.

(c)

7 marks

Explain proximate and ultimate analysis of fuel for the evaluation of various properties of coal.

(c)

7 marks

Enlist different theories behind coal forming process. Describe in detail.

Q.3

14 Marks

(a)

3 marks

Explain Long-Wall mining.

(b)

4 marks

Draw neat flow diagram for coal tar distillation.

(c)

7 marks

Describe F-T synthesis process for the production of gasoline via coal with neat block diagram.

(a)

3 marks

Explain Short-Wall mining.

(b)

4 marks

Define oxy-rich combustion and discuss its significance.

(c)

7 marks

Describe Methanol to Gasoline process (MTG) for the production of clean gasoline via coal with suitable chemical reactions involved.

Q.4

14 Marks

(a)

3 marks

Define LPG. List the various constituents of LPG.

(b)

4 marks

Write short notes on: (a) Refinery gas, (b) Blast furnace gas

(c)

7 marks

Describe the production of water gas with all chemical reactions involved.

(a)

3 marks

Enlist the techniques used for the removal of dust and ash particles from fuel gases.

(b)

4 marks

Write short note on hydrogen as a clean fuel.

(c)

7 marks

Describe the formation of methane in coal mines. Discuss its applicability as a fuel with safety.

Q.5

14 Marks

(a)

3 marks

Discuss in short about the stoker firing.

(b)

4 marks

List out the various characteristics of an efficient furnace.

(c)

7 marks

On assuming complete combustion, a liquid fuel (1.000 kg basis) has the following elemental mass composition (dry, no free water):

1C = 0.840 kg

2H = 0.120 kg

3S = 0.002 kg

4O = 0.020 kg

5N = 0.018 kg The dry air is having the molar composition of O₂ = 21.0% and N₂ = 79.0% (use the usual molar ratio N₂/O₂ = 3.76). The combustion is carried out at 1 atm and standard temperature for gas volumes at 25 °C (298.15 K), and volume Vm=24.465 m³/kmolV. Calculate the theoretical oxygen demand in kmol O₂ and stoichiometric air (kmol and kg) required for 1.000 kg fuel. Give the stoichiometric air/fuel mass ratio (A/F, mass basis).

(a)

3 marks

Define stoichiometric air and excess air requirement for combustion.

(b)

4 marks

Explain turn down ratio of burner. State the various types of gas burner with their application.

(c)

7 marks

An ultimate analysis of gasoline sample gave carbon 85%, hydrogen 15%. Calculate the ratio of air to gasoline consumption by weight if the volumetric analysis of the dry exhaust gas is CO2 = 11.5%; CO = 1.2%; O2 = 0.9%; and N2 = 86%. Also, determine the % of excess air required for complete combustion.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Fuels and Combustion (Summer 2026, B.E. · Chemical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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