BE Mechanical Engineering Semester 1 (FE First Year) - University of Mumbai Question Bank Solutions for Applied Chemistry 1

Calculate the quantity of the pure lime and soda required for softening of 1,00,000 litres of water containing the following impurities in ppm. The purity of lime is 70% and soda is BS% Ca(HCO₃) = 30.2 , Mg(HCO₃) = 20.8 ,CaCI₂ = 28.1 ,MgCl₂ = 8.78, CaSO₄ = 35, MgSO₄ = 6.7 .

Distinguish between thermoplastic and thermosetting resins. ?

How is gypsum useful in setting and hardening of cement?

Write the applications of Fullerenes.

Discuss fullerenes. Give its applications. 

Define lubricants and lubrication. Discuss the hydrodynamic lubrication in detail.

Calculate the amount of lime (85% pure) and soda (95% pure) required to soften one million litre of water which contains CaCO₃ = 12. 5ppml MgCO₃ = 8.4ppml
CaCl₂ = 22.2ppml ,  MgCl₂ = 9.5ppml C0₂ = 33ppml HCI = Z3ppml  organic matter= 16.Bppm 

What is reduced phase role?

Calculate the amount of lime {80 %purity) and soda {90% purity) required for softening of 50,000 of hard water whose chemical analysis results are given below. Ca(HCO₃ ) = 40.5 mg/L, Mg( HCO₃)₂ = 73.0 mg/L, MgSO₄ = 60.0 mg/L, CaSO₄ = 34.0 mg/L, CaCl₂ = 27.5 mg/L and NaCI = 20.0 mg/L.

Mention the conditions under which semi-solid lubricants can be used

Explain with the help of chemical reactions 'setting and hardening' process of cement.

What is reduced or condensed phase rule.

Write a note on Deccay of Concrete.

What are the conditions for use of solid lubricants? Discuss the structure and uses of Graphite.

Write a note on fullerene.

Explain the reduced phase rule .

A sample of water contains following impurities :
Mg(HCO3)2 =73 mg/lit , MgSO4 = 120 mg/lit , CaCl2 = 222 mg/lit and Ca(NO3)2 = 164 mg/lit . The purity of lime is 74% and soda is 90% . Calculate the quantity of lime and soda needed for softening of 50,000 litres of water .

Explain with the help of chemical reactions “ Setting and Hardening “ of cement .

Define 
a) Phase b) Component c) Degree of freedom

The hardness of 85000 litres of water sample was removed by passing it through a zeolite softener. The zeolite required 2000 litres of NaCl solution containing 190 mg/lit of NaCl for regeneration. calculate the hardness of sample.