Rajiv Gandhi Proudyogiki Vishwavidyalaya 2007 B.E Engineering Chemistry - Question Paper

(c) A polythene derivative
(d) None
(iii) Which of the subsequent has cross-links:
(a) Urea-formaldehyde resin
(b) Vulcanized Rubber
(c) Buna-S
(d) (a) and (b) both are accurate
(E) (i) Porosity in a refractory brick generally increases:
(a) Resistance to spelling
(b) Strength
(c) Density
(d) Melting point
(ii) In rotary cement kiln quick-lime is found in which zone:
(a) Drying zone
(b) Calcification zone
(c) Clinker zone
(d) (a) and (c) both
(iii) Identification of functional groups in a compound can be established by using:
(a) Column chromatography
(b) Ion-exchange chromatography
(c) Gas chromatography
(d) Thin-layer chromatography
2. (a)
What is caustic embrittlement?
OR

Write in brief how you can determine DO, BOD and COD in a water sample.
(b) (i)
What is scale formation in boiler? discuss disadvantages of scale formation and 2 prevention methods of it.
(ii)
compute the volumes of line and soda needed for softening 50,000 liters of water, containing the subsequent salts per liter:
Ca (HCO3)2 = 8.1 mg
Mg (HCO3)2 = 7.5 mg
CaSO4 = 13.6 mg
MgSO4 = 12 mg
MgCl2 = two mg
OR
50 ml of standard hard water containing one mg of pure CaCO3 per ml consumed 25 ml of ED TA. 50 ml of a water sample consumed 25 ml of the identical ED TA solution. Using eriochrome black-T as an indicator. compute the total hardness of water sample in ppm.
3. (a)
describe the term CV, HCV and LCV
OR
Why ethylene-dibromide is added with TEL while using as anti knocking agent? discuss with chemical equations involved in it.
(b)
(i) explain the parameters used in determination of proximate analysis of coal.
(ii) A sample of coal was obtained to have the subsequent percentage composition:
C = 75%, H = 5.2%, O = 12.1%, N = 4.5% and ash = 3.2%
compute the minimum amount of air needed for complete combustion of one kg of coal.
OR
What is cracking? discuss different kinds of cracking with neat tagged diagram
4. (a)
define the mechanism of hydrodynamic lubrication.
OR
How can you determine carbon residue in any lubricating oil?
(b)
(i) describe steam emulsion number (SEN) and aniline point with its significance.
(ii) An oil sample under test has a Say bolt universal viscosity identical as that of standard Gulf oil (low viscosity standard) and Pennsylvanian oil (high viscosity standard) at 210 0CF. Their Say bolt Universal viscosity at 100 0F are 600, 800 and 500 respectively. compute the viscosity index of the oil sample.
OR
(i) elaborate greases? explain important kinds of greases.
(ii) How can you determine Viscosity and Viscosity-index of a thin lubricating oil? discuss with neat tagged diagram.
5. (a) Write preparation, properties and uses of the subsequent (any three):
(i) Nylon 6:6
(ii) Buna-N
(iii) Bakelite
(iv) Vulcanized Rubber
(b) Write preparation, properties and uses of the subsequent (any three):
(i) Burty I-rubber
(ii) Epoxy resins
(iii) PM MA
6. (a)
How refractories of a refractory material can be determined by photometric cone equivalent (PCE) method?
OR
Write short note on Chromatography.
(b)
explain setting and hardening of Portland cement, with chemical reactions involved in it.
OR
Write informative notes on any 2 of the following:
(i) Lambert’s and Beer’s legal regulations
(ii) UV visible spectroscopy
(iii) IR spectroscopy

Earning:   Approval pending.