RTU Previous Year Question Papers BE First Year Engineering Chemistry-1 Feb 2010

RTU Previous Year Question Papers BE First Year

Engineering Chemistry-1 Feb 2010


Time : 3 Hours

Maximum Marks : 80

Min. Passing Marks : 24

Instructions to Candidates:

Attempt overall Five questions selecting one question from each unit. All questions carry equal marks.

Unit -1

1.a) What is hardness of water? What do you understand by temporary and

permanent hardness?

b)  Give the chemical reactions involved in determination of hardness of water by EDTA titration.

e)  A water sample contains 204 mg of CaSo4 per litre. Calculate the hardness in terms of CaCo3 equivalent.


2.  a) What do you mean by degree of hardness? Discuss the Clark’s test for the determination of hardness of water.

b)  Write informative notes on the followings

i)       Sedimentation.

ii)      Break point chlorination

iii)     Structure of EDTA and EBT.

Unit – II

3. a) State the Zeolite process for the removal of hardness of water. Discuss its

merits over lime-soda process.

b) What are boiler troubles? Discuss their consequences?

c) A water sample has the analytical report as under :

MgCo3 – 84 mg//

CaCo3 – 40 mg//

CaCl2 – 55.5 mg//

Mg(No3)2 – 37 mg//

Kc/ – 20 mg//

Calculate the amount of lime (86% pure) and soda (83% pure) needed for the treatment of 80,000 litres of water.


4.a) Write short note on

i) Demineralization process of water softening

ii) Caustic embrittlement.

iii) Carry over in steam boiler.

b) A water sample on analysis gives the following data : Ca2+ = 20 ppm,

Mg2+ = 25 ppm, Co2=30 ppm, HCo”=150 ppm, K+= 10 ppm. Calculate the lime (87% pure) and soda (91% pure) required to soften 1 million litres of water sample.


5. a) Discuss the classification of polymers.

b) Differentiate the thermoplasts and thermosets.

c) Explain the reactions involved in vulcanisation.

d) Anionic addition polymerisation.


6. Write short note on the following :

b) Nylon 6,6

c) BUNA Rubber

d) Neoprene

e) Natural rubber

f) Terylene.

g) Polythene

h) Butyl rubber.

Unit – IV

7. a) Draw a labelled diagram of rotary kiln. Write chemical reactions taking

place in the various zones of rotary kiln.

b) Discuss the manufacture of glass.

c) Give the composition, properties and uses of borosilicate glass.


8. a) Describe the process of ‘setting’ and ‘hardening’ of cement concrete, giving the reactions involved in such processes. What is the difference, if any,

between ‘setting’ and ‘hardening’?

b)     Write brief note on types of glass.

c)      Write an account of soda lime glass and safety glass.


9. a) What are the requisites of a good refractory?

b) Discuss the seger’s (Pyrometric) cone test.

c) Write brief note on flash and fire point.

d) Discuss the various types of lubrication.


10. a) What are refractories? Write briefly on silica refractory.

b) Write short note on RUL test.

c) What do you mean by cloud and pour point.

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