www.exams.puchd.ac.in OCET ME Chemical Model Question Paper : Panjab University

[hemalathaijt]

Panjab University
OCET 2011
Subject : M.E. (Chemical)
Time : 90 minutes Number of Questions : 75 Maximum Marks : 75

Model Question List : http://exams.puchd.ac.in/show-noticeboard.php?id=211
Model Question Paper : http://exams.puchd.ac.in/includes/no...105-08-MCH.pdf

1. 10 kg of 70% aqueous NaOH solution is mixed with 16 kg of 80% aqueous H2SO4 solution to produce Na2SO4. The percent excess is approximately equal to :
(A) 39 (B) 49
(C) 59 (D) 69

2. Density of dry air at 100ºC and 1.5 bar is approximately equal to :
(A) 1.4 kg/m3 (B) 2.4 kg/m3
(C) 3.4 kg/m3 (D) 4.4 kg/m3

3. Molarity of a 20% by weight aqueous solution of NaOH at 30ºC having density equal to 1120 kg/m3 will be :
(A) 4.6 (B) 7.6
(C) 9.6 (D) 5.6

4. The vapour pressure in mmHg of water at 25ºC (average molar latent heat of vaporization 9720 cal/ mol) using Clausius-Clapeyron equation will be :
(A) 27.69 (B) 63.76
(C) 12.02 (D) 121.52

5. 200 kg of NH4NO3 charged to a reactor gave 70 kg of N2O
NH4NO3 ? N2O + 2H2O
The percent conversion is :
(A) 43.6 (B) 63.6
(C) 53.6 (D) 73.6

6. The total pressure of vapours at equilibrium at 30ºC in contact with a liquid mixture containing 25 mol% benzene and 75 mol% toluene will be :
(Take PO C6H6 = 119 mm Hg, PO C7H8 = 36.7 mm Hg),
(A) 158 mm Hg (B) 57.27 mm Hg
(C) 760 mm Hg (D) 48 mm Hg

7. For estimation of heat capacity of a solid compound, one can use :
(A) Clapeyron’s equation (B) Gibb’s equation
(C) Kopp’s rule (D) Trouton’s rule

8. 90 kg/hr of air is being compressed from 1 atm (H^ = 117 kcal/kg) to 10 atm (H^ = 122 kcal/kg). The exit velocity from the compressor is 60 m/s. Assuming adiabatic condition, what is the hp required for compression ?
(A) 1.54 (B) 3.84
(C) 0.76 (D) 10.36

9. The Reynolds number of a solid particle falling in a fluid is 1500. Drag coefficient will be :
(A) 0.016 (B) 0.0107
(C) 0.44 (D) 0.064

10. The sphericity shape factor for a cylinder having diameter is length :
(A) 1.0 (B) 0.874
(C) 0.806 (D) 0.60

11. An oil having density of 878 kg/m3 is flowing through a pipe having 0.1541 m diameter in which a sharp edged orifice is installed. The pressure difference across the orifice is 93.2 kN/m2. The velocity of the oil in m/s corresponding to an orifice coefficient 0.61 is :
(A) 8.97 (B) 89.7
(C) 0.897 (D) 897

12. Water at 50ºC (density = 988 kg/m3, vapour pressure = 12.35 kPa) is in an open tank. The pump is 3.0 m above the open tank. The velocity in the pipe is 0.9 m/s. The available NPSH will be approximately :
(A) 5.14 m (B) 10.28 m
(C) 7.14 m (D) 3.14 m

13. Pump efficiency of a typical centrifugal pump having 1000 gal/min capacity is :
(A) 20% (B) 30%
(C) 50% (D) 85%

14. The Fanning friction factor for a flowing fluid having Reynolds number 1000 is :
(A) 0.024 (B) 0.016
(C) 0.064 (D) 0.048

15. Heat loss per m2 of surface area for an insulating wall composed of 25.4 mm thick fiber insulating board (k = 0.048 W/(m)(k)), where the inside temperature is 352.7 k and the outside temperature is 297.1 k is approximately :
(A) 105 W (B) 210 W
(C) 315 W (D) 420 W