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February 2019

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?

Chemical Engineering Basics /
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?

A. x1.5
B. x0.8
C. x-1.5
D. x-0.8

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ? Read More »

Chemical Engineering Basics

A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre?

Chemical Engineering Basics /
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre?

A. 0.01
B. 0.1
C. 0.25
D. 0.5

A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre? Read More »

Chemical Engineering Basics

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is_______________?

Chemical Engineering Basics /
Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is_______________?

A. R ln 2
B. -R ln 2
C. 3 R ln 2
D. -3R ln 2

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is_______________? Read More »

Chemical Engineering Basics

In case of compression of one kg of air, the work done will be the least, when the value of polytropic index ‘n’ is______________________?

Chemical Engineering Basics /
In case of compression of one kg of air, the work done will be the least, when the value of polytropic index ‘n’ is______________________?

A. 1
B. 1.4
C. 1.5
D. Y = Cp/Cv

In case of compression of one kg of air, the work done will be the least, when the value of polytropic index ‘n’ is______________________? Read More »

Chemical Engineering Basics

The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?

Chemical Engineering Basics /
The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?

A. A
B. D
C. 1/A
D. 1/A2

The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ? Read More »

Chemical Engineering Basics