Download GTU B.Tech 2020 Winter 5th Sem 3150509 Fuels And Combustion Question Paper

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Subject Code:3150509

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
Subject Name:Fuels and Combustion
Time:10:30 AM TO 12:30 PM

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) State the different characteristics of a good fuel required for combustion. (03)

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(b) Discuss in short about the scenario of coal reservoirs in India. (04)

(c) Write in brief about the theories suggested by geologists regarding the mechanism of formation of coal. (07)

Q.2 (a) Briefly explain various important properties of coal. (03)

(b) State the different objectives and industrial applications of coal washing. (04)

(c) Write a short note on origin of petroleum and natural gas. (07)

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Q.3 (a) Name the types of crude distillation methods used in petroleum industries. (03)

(b) Enlist the refining products of petroleum. (04)

(c) What are bio-fuels? Discuss in detail about the production process and technologies required for bio-fuels. (07)

Q.4 (a) Name the various methods to produce the hydrogen gas. (03)

(b) Briefly explain the storage and handling of acetylene gas. (04)

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(c) What is producer gas? Discuss the different reactions involved in the production of producer gas. (07)

Q.5 (a) Explain the consequence of presence of nitrogen during combustion process. (03)

(b) Define air to fuel ratio. Determine the air to fuel ratio when octane (C₈H₁₈) is burned with 200% theoretical air. (04)

(c) The following is the ultimate analysis of a sample of petrol by weight: Carbon = 85%, Hydrogen = 15%. Calculate the ratio of air to petrol consumption by weight if the volumetric analysis of the dry exhaust gas is: CO₂ = 11.5%, CO =1.2%, O₂ =0.9%, N₂ = 86%. Also find percentage excess air. (07)

Q.6 (a) Define calorific value, gross calorific value and net calorific value of fuel. (03)

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(b) Calculate the heating value of Methane. It may be assumed the methane is burnt in pure oxygen and does not contain any water vapour. The reaction stoichiometry is
CH₄ (g) + 2O₂ (g) = CO₂ (g) + 2H₂O (l)
The heat of formation data are as follows: ?H°_f of CO₂ (g) = -393.5 kJ/mol, ?H°_f of H₂O (g) = -242.8 kJ/mol and ?H°_f of CH₄ (g) = -74.8 kJ/mol (04)

(c) Derive the expression for the first law analysis of reacting system for the steady flow processes. (07)

Q.7 (a) Briefly discuss the combustion of oil. (03)

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(b) State the two advantages and disadvantages of pulverized fuel firing. (04)

(c) With neat sketch explain the concept of flame structure, propagation and Date:22/01/2021 Total Marks: 56 (07)

Q.8 (a) Listout the various characteristics of an efficient furnace. (03)

(b) What do you mean by turn down ratio of burner? State the various types of gas burner with their applications. (04)

(c) With neat diagram discuss the working and industrial applications of fluidized bed combustion process. (07)

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