Shivaji University 2005 B.E Mechanical Engineering Engineering Chemistry-1 - Question Paper

ENGINEERING CHEMISTRY-I
Day and Date-Wednesday,7-12-2005 Max. Marks :50
Time :2 Hours

Instructions: i)Solve any 2 ques. every from both parts.
ii)Figures to right indicate full marks.
iii)Use blue ink only.
iv)Given - Molecular wts.a)CaSO4 -136
b)Ca(HCO3)-162
c)Mg(HCO3)2-146


SECTION-I

1.a)Give an account of precipitation titration. [Marks: 4]
b)Calculate molarity and normality of solution containing 120 gm.Calcium
sulphate in 500 ml solution. [Marks: 4]
c)Explain sedimentation with coagulation. [Marks:4]

2.a)A water sample was obtained to containfollowing salts in mg/lit. Determine
its temporary, permanent and total hardness in ppm.
i)Ca(HCO3)2-8.1 ii)Mg(HCO3)2-29.2 iii)CaSO4-136 [Marks: 4]
b)Describe ion exchange process of water softning. [Marks: 5]
c)Give an account of boundary lubrication. [Marks: 4]

3.Write notes on(any three): [Marks: 3X4=12]
a)Extreme pressure lubrication
b)Primary and Secondary standards
c)Viscosity index
d)Selection of lubricant

SECTION-II

4.a)Define corrosion and define hydrogen
evolution mechanism.[Marks: 5]
b)Compare galvanic and electrochemical series.[Marks: 4]
c)Give properties and uses of wrought iron.[Marks: 4]


5.a)Distinguish ranging from grey and white cast iron.[Marks: 4]
b)Explain Nernst theory of electrode potential. [Marks: 4]
c)Cathodic protection discuss with examples. [Marks: 4]


6.Write notes on(any three):[Marks: 3X4=12]
a)Tinning and galvanising
b)Design and protection from corrosion
c)Constituent of points
d)Electrochemical cell.

Earning:   Approval pending.