Applied Chemistry 1 - May 2015
First Year Engineering (Semester 1)
TOTAL MARKS: 60
TOTAL TIME: 2 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Use suitable data wherever required.
(4) Figures to the right indicate full marks.
Attempt any five of the following:
1 (a) Differentiate between temporary and permanent hardness.(3 marks)
1 (b) Explain Glass transition temperature of polymer and its significance.(3 marks)
1 (c) Define lubrication and give functions of lubricant.(3 marks)
1 (d) Define phase, Component and Degree of freedom.(3 marks)
1 (e) Write the preparation, properties and uses of Dolomite bricks.(3 marks)
1 (f) Give the preparation, properties and uses of Buna-3.(3 marks)
1 (g) Calculate all types of hardness of water sample containing:
Ca(HCO3)2=81 ppm MgSO4=60 ppm, MgCO3=42 ppm, Ca(NO3)2=82 ppm.(3 marks) 2 (a) A water sample has the analytical report as under
MgCO3=84 ppm, CaCO3=40 ppm, CaCI2=55.5 ppm, Mg(NO3)2=37 ppm, KCI=10 ppm. Calculate lime & soda required for softening 1 litre of water.(6 marks) 2 (b) State Gibb's phase rule. Give its application to one component system.(5 marks) 2 (c) What are refractories? Give the preparation, Properties and uses carborundum bricks.(4 marks) 3 (a) Define and give the significance of the following properties of lubricants:
i) Flash Point
ii) Pour point
iii) Viscosity Index(6 marks) 3 (b) Explain Compounding of plastics. (five ingredients).(5 marks) 3 (c) What is Condensed phase systems. Draw the phase diagram of an Ag-Pb system with proper labelling.(4 marks) 4 (a) Write the preparation, properties and application of Bakelite.(6 marks) 4 (b) Write note on Ultra filtration and Reverse osmosis.(5 marks) 4 (c) 0.5 g of an oil is saponified with 50 ml of alcholic KOH solution. After refluxing the mixture, it required 22 ml of 0.1 NHCI solution. Find the Saponification value of given sample.(4 marks) 5 (a) Explain manufacturing of Portland cement (wet process) with a lebelled diagram of a rotary kiln.(6 marks) 5 (b) Define Fabrication. Explain Compression moulding with labelled diagram.(5 marks) 5 (c) A Zeolite softener was regenerated by passing 200 litre of NaCI solution, containing 50g/litre of NaCI. How many litre of water of hardness 50 ppm can be softened by this softener.(4 marks) 6 (a) Describe Zeolite method with a labelled diagram.(6 marks) 6 (b) Give the preparation and applications of any two of the following:
ii) Kevlar and
iii) Silicon rubber.(5 marks) 6 (c) Under which conditions use of semi solid lubricants is preferred.(4 marks)