JECRC University Engineering Chemistry Past Paper PDF 2024

# JECRC University, Jaipur ## II- In Term Examination, Nov-2024 ### B. Tech I Semester #### Subject: Engineering Chemistry #### Time: 1:15 hours #### Subject code: DCH002A #### Max. Marks: 40 **Instructions:** 1. Answer all questions. 2. Draw figures whenever necessary. 3. Write legibly on both sid...

# JECRC University, Jaipur ## II- In Term Examination, Nov-2024 ### B. Tech I Semester #### Subject: Engineering Chemistry #### Time: 1:15 hours #### Subject code: DCH002A #### Max. Marks: 40 **Instructions:** 1. Answer all questions. 2. Draw figures whenever necessary. 3. Write legibly on both sides of the answer book. 4. Write the question number clearly while answering. **COURSE OUTCOMES:** - **CO-1** Students will be able to explain the impurities of water (mainly hardness) and boiler troubles and also different methods to remove hardness of water. - **CO-2** Students will be able to analyze the basic knowledge of various types of Fuels, Lubricants their properties and Industrial Applications. - **CO-3** Students will be able to understand relate electrochemistry and corrosion. - **CO-4** Students will be able to understand about different types of nano materials and polymers. - **CO-5** Students will be able to understand the basic concept of green chemistry and its emerging applications in Industries and for protection of environment. ## Part-A (2 Marks each) 1. **[CO 3] A1** What is electrode potential? 2. **[CO 4] A2** Discuss bottom-up approach for the synthesis of nanoparticles with the help of a neat diagram. ## Part-B (7 Marks each) 1. **[CO 3] B1** How sacrificial anodic protection is used to protect metal from corrosion? 2. **[CO 4] B2** How nanotechnology is used in water purification? ## Part-C (11 Marks each) 1. **[CO 3] C1** Explain mechanism of oxidative corrosion with the help of cathodic and anodic reactions. How nature of protective oxide layer affect corrosion? (5+6) 2. **[CO 4] C2** Classify nanomaterials based on their dimensions. # JECRC University, Jaipur ## I- In Term Examination, Sep-2024 ### B. Tech I Semester #### Subject: Engineering Chemistry #### Time: 1:15 hours #### Subject code: DCH002A #### Max. Marks: 40 **Instructions:** 1. Answer all questions. 2. Draw figures whenever necessary. 3. Write legibly on both sides of the answer book. 4. Write the question number clearly while answering. **COURSE OUTCOMES:** - **CO-1** Students will be able to explain the impurities of water (mainly hardness) and boiler troubles and also different methods to remove hardness of water. - **CO-2** Students will be able to analyze the basic knowledge of various types of Fuels, Lubricants their properties and Industrial Applications. ## Part-A (2 Marks each) 1. Explain scales and sludges formation with reactions. [CO 1] 2. Define flash and fire point of lubricants with its significance. [CO2] ## Part-B (7 Marks each) 1. a) Explain water disinfection process using bleaching powder. [CO 1] b) A hard water sample has hardness 600 ppm, calculate the hardness in Clarke and French units. [CO 1] (3+4) 2. What is lubrication? Explain thin film lubrication in detail. [CO2] ## Part-C (11 Marks each) 1. a) What is the molecular formula of zeolite? Explain zeolite process involved in water softening process. [CO 1] b) A water sample was analyzed and found to contain the following: [CO 1] - SiO2 = 500 mg/L, temporary magnesium hardness = 25 mg/L - Permanent magnesium chloride = 15 mg/L, permanent calcium sulphate = 20 mg/L Calculate lime and soda required for 30,000 liters of hard water. (5 + 6) 2. a) Explain cloud and pour point in detail. [CO2] b) Explain neutralization number and precipitation number. [CO2] # JECRC UNIVERSITY, JAIPUR ## II In Sem Examination, 2023 ### B. Tech I Semester #### Engineering Chemistry (DCH002A) #### Time: 1.15 Hrs #### Maximum Marks - 40 **Course out-Comes (CO)** - **CO-1** Students will be able to explain the impurities of water (mainly hardness) and boiler troubles and also different methods to remove hardness of water. - **CO-2** Students will be able to analyze the basic knowledge of various types of Fuels, Lubricants their properties and Industrial Applications. - **CO-3** Students will be able to understand relate electrochemistry and corrosion. - **CO-4** Students will be able to understand about different types of nano materials and polymers. - **CO-5** Students will be able to understand the basic concept of Green chemistry and its emerging applications in Industries and for protection of environment. **Instructions:** 1. Attempt all the questions. 2. Illustrate your answers with suitable examples and diagrams, wherever necessary. 3. Write relevant question numbers before writing the answer ## Part A (2x2=4 marks) **Very Short Answer Questions: - total 2 questions.** - **CO 3 Q. 1** What is electrode potential? - **CO 4** How nanotechnology is used in water purification? ## Part B (7x2=14 marks) **Short Answer Questions: - total 2 questions.** - **CO 3 Q. 3** How sacrificial anodic protection is used to protect metal from corrosion? - **CO 4 Q. 4** How nanoparticles be synthesized by means of bottom up and top down approaches? ## Part C (11x2=22 marks) **Long Answer Questions: - total 2 questions.** - **CO 3 Q. 5** Explain mechanism of rusting of iron by electrochemical corrosion. - **CO 4 Q. 6** Describe different types of nanoparticles. Give characteristic properties of carbon nano wires and fullerenes. # JECRC UNIVERSITY, JAIPUR ## END Sem Examination, 2023 ### B. Tech I Semester #### Engineering Chemistry (DCH002A) #### Time:-3 Hrs #### Maximum Marks - 100 **Course out-Comes (CO)** - **CO-1** Students will be able to explain the impurities of water (mainly hardness) and boiler troubles and also differerit methods to remove hardness of water. - **CO-2** Students will be able to analyze the basic knowledge of various types of Fuels, Lubricants their properties and Industrial Applications. - **CO-3** Students will be able to understand relate electrochemistry and corrosion. - **CO-4** Students will be able to understand about different types of nano materials and polymers. - **CO-5** Students will be able to understand the basic concept of Green chemistry and its emerging applications in Industries and for protection of environment. **Instructions:** 1. Atternpt all the questions. 2. Illustrate your answers with suitable examples and diagrams, wherever necessary. 3. Write relevant question numbers before writing the answer ## Part A (2x5=10 marks) **Very Short Answer Questions: - total 5questions.** - **CO 1 Q. 1** What are different Sterilization techniques used for disinfection of water? - **CO 2 Q.2** What is meant by Octane number of a gasoline. - **CO 3Q. 3** What is significance of electrochemical series? - **CO 4 Q. 4** What aredifferent methods used for the characterisation of nanomaterials? - **C.05 Q.5** Give examples of Green energy sources. ## Part B (7x5=35 marks) **Short Answer Questions: - total 5 questions.** - **CO 1 Q. 1**Explain different types of boiler troubles. - **CO 2 Q.2** What are lubricants. Explain different methods used for lubrication. - **CO 3Q. 3** Explaincorrosion and mechanism of wet corrosion. - **CO 4Q.** Write a note on applications of nanomaterials? - **CO 5 Q. 5** Explainatom Economy by taking examples. ## Part C (11x5=55 marks) **Long Answer Questions: - total 5questions.** - **CO 1 Q. 1** What isdifference between external and Internal treatment of water. A Hard water sample having following composition has to be softened using Lime Soda Process: - MgSO4-84 ppm, Mg(HCO3)2= 56 ppm, CaSO4=98 ppm, Ca(HCO3)2= 220 ppm and MgCl2-130 ppm. Calculate the amount of lime and Soda required to soften 10º Litres of water. - **CO 2Q. 2**Explain working principle of Bomb calorimeter. The fuel on combustion in bomb calorimeter gave following data: - Weight of coal sample burnt= 1g, - Weight of water taken in calorimeter==2560g, - water equivalent of calorimeter=440g, - rise in temperature=2.42°C, - Cooling correction := 0.052°C, - fuse wire correction= 10 cal. Calculate high and low calorific value, if the coal sample contains 6% hydrogen. - **CO 3 Q. 3**Explain different methods used to protect metal from corrosion? - **CO 4 Q. 4** Explain different approaches of synthesizing nano particles? - **CO 5 Q. 5** Explain principles of green chemistry. # JECRC University, Jaipur ## III- In Term Examination, 2024 ### B. Tech I Semester #### Subject: Engineering Chemistry #### Time: 1:15 hours #### Subject code: DCH002A #### Max. Marks: 40 **Instructions** - Answer all questions. - Draw figures whenever necessary. - Write legibly on both sides of the answer book. - Write the question number clearly while answering. **COURSE OUTCOMES:** - **CO-1** Students will be able to explain the impurities of water (mainly hardness) and boiler troubles and also different methods to remove hardness of water. - **CO-2** Students will be able to analyze the basic knowledge of various types of Fuels, Lubricants their properties and Industrial Applications. - **CO-3** Students will be able to understand relate electrochemistry and corrosion. - **CO-4** Students will be able to understand about different types of nano materials and polymers. ## Part-A (2 Marks each) 1. How permanent hardness is generated in water. [CO 1] Or What is liquid metal corrosion?. [CO-3] 2. What do you understand by calorific value of fuel. [CO2] Or What is SEM and TEM Techniques [CO-4] ## Part-B (7 Marks each) 1. Elaborate caustic embrittlement, its causes and consequences with suitable reactions and representations. Or How hot dipping and cementation is different from each other in terms of the protection of corrosion, give suitable examples [CO-3] 2. What are the different characteristics of a good fuel. [CO 2] Or Explain top down and bottom up approach of nano particles synthesis, give name and brief account of the different methods of both the approaches [CO-4] ## Part-C (11 Marks each) 1. Give brief account of EDTA method for the determination of the hardness of water. [CO-1] A water sample consumed 18 ml of EDTA Solution when titrated, same sample on boiling and cooling again titrated with same EDTA solution and consumed 9 ml of EDTA. A standard hard water solution of strength 1gm/L consumed 25 ml of same EDTA. Calculate the total, permanent and temporary hardness. Or Enumerate different types of dry or chemical corrosion and also the relevance of piling- Bedworh rule 2. How will you determine the calorific value of solid fuel by bomb calorimeter, also give all the formula and diagram to substantiate your answer (CO2) Or Give applications of nano materials in different field