CHE414 Transfer Operations-I B.Tech Question Paper : wbut.ac.in
Name of the University : West Bengal University of Technology
Department : Bio-Technology
Degree : B.Tech
Sem : IV
Subject Code/Name : CHE-414/Transfer Operations-I
Website : wbut.ac.in
Document Type : Previous Year Examination Question Paper
Download Model/Sample Question Paper :
2009 : https://www.pdfquestion.in/uploads/qpaper.wbut.ac.in/6729-2009CHE-414.pdf
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2013 : https://www.pdfquestion.in/uploads/qpaper.wbut.ac.in/6729-2013CHE-414(3).pdf
Transfer Operations-I Question Paper :
Engineering & Management Examinations, June – 2009 :
Semester – 4 :
Time : 3 Hours
Full Marks : 70
Related : West Bengal University of Technology BT403 Molecular Biology & R-Dna Technology B.Tech Question Paper : www.pdfquestion.in/6728.html
GROUP – A :
( Multiple Choice Type Questions )
1. Choose the correct alternatives for any ten of the following : 10 × 1 = 10
i) Power law behaviour of pseudoplastic is for
a) n = 1 b) n = 0
c) n < 1 d) n > 1.
ii) An example of Newtonian fluid is
a) non-colloidal solution b) Sewage sludge
c) Rubber latex d) Quicksand.
iii) A stremline is
a) always the path of a particle
b) a line drawn in the flow region such that the tangent drawn at any point on the line indicates the direction of velocity
c) a line drawn in the flow region such that there is mass flow across the line
d) not fixed in steady flow.
v) In the steady laminar flow of a Newtonian fluid at constant pressure through the
cylindrical pipe, the velocity varies as the
a) pipe diameter
b) square root of the pipe diameter
c) square of the pipe diameter
d) cube of the pipe diameter.
vi) Prandtl number is the
a) ratio of kinematic viscosity to thermal diffusivity
b) ratio of thermal diffusivity to kinematic viscosity
c) product of thermal diffusivity and kinematic viscosity
d) ratio of absolute viscosity to thermal conductivity.
vii) The unit of Stefan-Boltzmann constant is
a) W / ( m 2 .K ) b) W / ( m 2 . K 4 )
c) W/m 2 d) W/( m.K 4 ).
viii) Fouling factor ( R f ) is defined as
a) R f = U clean – U dirty b) R f = 1/U dirty – 1/U clean
c) R f = 1/U clean – 1/U dirty d) R f = 1/ ( U clean U dirty ) 1/2 .
ix) For compressible sludge, the specific cake resistance
a) remains unaffected with the change in the pressure drop across the cake
b) increases with increase in pressure drop across the cake
c) decreases with increase in pressure drop across the cake
d) increases linearly with increase in the pressure drop across the cake.
x) Devices which separate particles of differing densities are known as
a) Sorting classifiers b) Thickeners
c) Cyclones d) filters.
xi) In screen analysis, the notation 60/72 means
a) passing through 60 mesh retained on 72 mesh
b) passing through 72 mesh retained on 60 mesh
c) 60 gm fines and 72 gm coarse
d) 72 gm fines and 60 gm coarse.
xii) The flow number, N Q , is defined by
a) ND 3 / Q b) Q / ND 3
c) P / N 3 D 5 ? d) N 3 D 5 ?/P
where Q = Volumetric flow rate through the impeller
N = Rotational speed of impeller
D = Diameter of impeller
P = Power
? = Density of fluid.
GROUP – B : ( Short Answer Type Questions )
Answer any three of the following questions. 3 × 5 = 15
2. State the operating principle of Ball mill. Derive the relation between critical speed of a ball mill with radius of balls and ball mill. 2 + 3
3. Draw and explain the characteristic curves for centrifugal pump. What is priming of pump ? 3 + 2
4. A flat furnace hall is constructed of 150 mm layer of Sil-o-cel brick with thermal conductivity of 0·138 W/m°C. The temperature of the inner face of the wall is 700°C and that of the outer surface is 70°C. What is the heat loss from 1 m 2 of the wall ? 5
5. Derive the Hagen-Poiseuille equation. 5
6. What is meant by LMTD ? Derive the equation for LMTD for a countercurrent heat exchanger. 1 + 4
GROUP – C : ( Long Answer Type Questions )
Answer any three of the following questions. 3 × 15 = 45
7. a) Differentiate between reciprocating pump and centrifugal pump.
b) Derive the expression for terminal-settling velocity of a spherical particle in a fluid medium under Stokes law region.
c) Calculate the velocity gradient at distances 0 mm, 100 mm and 150 mm from the boundary if the velocity profile is a parabola with vertex 150 mm from the boundary where the velocity is 1 m/s. Also calculate the shear stresses at these points if the fluid has a viscosity of 0·804 N-S/m 2 . 2 + 8 + 5
8. a) Define thixotropic and rheopectic fluids with examples.
b) What is the difference between kinematic viscosity and eddy diffusivity of momentum ?
c) A sharp edged orifice with an aperture of 20 mm diameter is inserted in a 50 mm ID pipeline carrying a raw material from the neighbouring factory. What charges are to be paid per day to the factory for the chemical received, if the material costs Rs. 2 per kg. Given,
Average viscosity of raw material = 0·7 cP.
Average density of fluid = 1·3 gm/c.c.
Manometer connected across the orifice reads 10 cm of Hg.
Orifice coefficient = 0·61.
d) Define minimum fluidization velocity. Draw the representative free hand graph of Pressure drop vs. velocity and bed height vs. velocity of liquid in a fluidized bed reactor.