Calicut University 2010-2nd Sem B.Tech Combined first and pten/en 09 104-engineering chemistry - Question Paper

COMBINED 1st AND 2nd SEMESTER BTECH examination 2010 MAY
PTEN/EN 09 104-ENGINEERING CHEMISTRY
TIME three HRS MAX:70 MARKS
PART A
ans ALL ques..
every ques. CARRIES two MARKS.
1.What are semiconductors? provide an example for n-type semiconductors.
2.what is hardness of water? How is it expressed?
3.Give 1 example every for thermosetting plastics and thermoplastics ploymers.
4.Define reduction potential and oxidation potential.
5.Define Pilling-Bed Worth rule.
PART B
ans ANY four ques..
every ques. CARRIES five MARKS.
6.Write about the application of carbon nanotubes and nanowires.
7.How is hardness of water sample estimated through EDTA titration?
8.Discuss the mechanism of cationic polymerization.
9.What are synthetic rubbers? provide the preparation and structure of any two synthetic rubbers?
10.The potential of a hydrogen gas electrode in a solution of an acid of unknown strength is 0.29V at 298k as measured against normal hydrogen electrode.Caculate the pH of acid solution.
11.Give an account on photochemical smog and ozone depletion.
PART C
ans SECTION(a) OR (b)OF every ques..
every ques. CARRIES 10 MARKS.
12(a)Discuss all aspects of electrical conductivity in solids based on band theory.
or
(b)Bring out the different steps involved in the purification of water for domestic use.
13(a)Explain the structre relation to properties of polymers,discuss the process and applications of vulcanisation.
or
(b)explain thin film mechanism of lubrication.Discuss any four properties of lubricants.
14(a)what are fuel cells?Explain the construction and application of H2/O2 fuel cells.
or
(b)Derive Nernst formula.
15(a) discuss the mechanism of wet corrosion.Give details of protection through sacrifical anodic method and impressed current method.
or
(b)(1)How are metals protected fom corrosion by electroplating?
(2)Write a short account on thermal pollution.

Earning:   Approval pending.