JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year ENGINEERING CHEMISTRY Previous Question Paper (August - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
PART - A
What is Pilling-Bedworth rule?
Answer
The Pilling-Bedworth rule states that a metal oxide layer provides a protective, corrosion-resistant coating if the volume of the oxide formed is greater than the volume of the metal consumed. This is expressed as the Pilling-Bedworth ratio, which is the ratio of the volume of the oxide to the volume of the metal.
What is Electrochemical series?
Answer
The electrochemical series is an arrangement of various electrodes or metals in the order of their increasing or decreasing standard reduction potential values measured at 25°C against a standard hydrogen electrode. It helps in predicting the relative reactivity of metals, displacement reactions, and the feasibility of corrosion.
Explain why natural rubber need vulcanization.
Answer
Sign in to view the complete answer paper.
What is refractory and refractoriness?
Answer
Sign in to view the complete answer paper.
What is priming? How can it be prevented?
Answer
Sign in to view the complete answer paper.
What are the specifications of potable water?
Answer
Sign in to view the complete answer paper.
Give the classification of the fuels with suitable examples.
Answer
Sign in to view the complete answer paper.
Define gross and net calorific value and give their inter relationship.
Answer
Sign in to view the complete answer paper.
What is triple point?
Answer
Sign in to view the complete answer paper.
Derive an expression for Freundlich adsorption isotherm.
Answer
Sign in to view the complete answer paper.
PART - B
Give the mechanism of electrochemical corrosion of iron.
Answer
Sign in to view the complete answer paper.
What is Concentration cell? Explain with an example.
Answer
Sign in to view the complete answer paper.
Derive Nernst equation and explain its applications.
Answer
Sign in to view the complete answer paper.
Discuss the various factors influencing the rate of corrosion.
Answer
Sign in to view the complete answer paper.
What are conducting polymers? Explain the conduction mechanism in polyacetylenes.
Answer
Sign in to view the complete answer paper.
What is a lubricant? Give the characteristics of good lubricants.
Answer
Sign in to view the complete answer paper.
How do you prepare nanomaterials by chemical vapour deposition method?
Answer
Sign in to view the complete answer paper.
What are Biodegradable polymers? Explain their advantages.
Answer
Sign in to view the complete answer paper.
Explain the complexometric method of determination of the hardness of water.
Answer
Sign in to view the complete answer paper.
What are Scales and sludges and explain their prevention methods?
Answer
Sign in to view the complete answer paper.
Calculate the amount of lime and soda required in kg for softening 10,000L of water containing following impurities: Ca(HCO3)2=1.62mg/L, CaSO4=0.34mg/L, NaCl=0.75mg/L, MgCl2=0.95mg/L.
Answer
Sign in to view the complete answer paper.
What is internal treatment of boiler water? Give an account on calgon conditioning.
Answer
Sign in to view the complete answer paper.
How is nitrogen determined in a solid fuel?
Answer
Sign in to view the complete answer paper.
What is flue gas? How is it analysed by Orsats apparatus?
Answer
Sign in to view the complete answer paper.
How the calorific value of a gaseous fuel is determined by Junker’s gas calorimeter? Explain with a neat diagram.
Answer
Sign in to view the complete answer paper.
Explain Proximate analysis of coal. How is it different from ultimate analysis?
Answer
Sign in to view the complete answer paper.
Describe the phase diagram of lead-silver system.
Answer
Sign in to view the complete answer paper.
Discuss classification and optical properties of colloids.
Answer
Sign in to view the complete answer paper.
What are the differences between physisorption and chemisorptions?
Answer
Sign in to view the complete answer paper.
Explain the phase changes in water system with the help of phase diagram.
Answer
Sign in to view the complete answer paper.