WorksheetsTransport Phenomena - Objective Test 1
Total questions: 33
Worksheet time: 17mins
Heat transfer takes place in liquids and gases is essentially due to _____________________
Radiation
Conduction
Convection
Conduction as well as convection
Identify the wrong statement
a)
b)
c)
d)
The process of heat transfer is an irreversible process
For heat exchange, a temperature gradient must exist
A material medium is not necessary for heat transmission
Heat flow doesn’t depend on temperature
The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there ?
One
Two
Three
Four
How many types of convection process are there?
One
Three
Four
Two
Negative sign in Fourier heat conduction equation indicates
Heat always flow is in the direction of positive temperature gradient
Heat always flow in the direction of negative temperature gradient
No heat flow is there
Data is insufficient
Which one is not the unit of thermal conductivity ?
kcal/m hr K
KJ/m hr K
W/m s K
Cal/cm s K
The fluids which obey Newton’s law of viscosity are called _________________________ fluids
Non Newtonian fluid
Newtonian fluid
Both of these
None of these
The relationship between the shear stress and shear rate in the real fluids are part of __________________ .
Non Newtonian behavior
Newtonian behavior
Rheological behavior
None of these
If the shear stress is dependent on time under constant shear rate are called as __________________________ .
Shear dependent fluids
Time dependent fluids
All of the above
None of the above
Drilling mud, toothpaste, sewage sludge, chocolate mixture, greases, soap, paper pulp are the examples of _______________________ .
Di latent fluids
Pseudo plastic fluids
Bingham plastic fluids
Reopectic fluids
These fluids exhibit the behavior of increase in shear stress with the time at a constant rate of shear are called _________________________.
Dilatent fluids
Rheopectic fluids
Thixotropic fluids
None of above
The viscosity of liquids is generally much greater than those of gases. The liquid viscosity decrease significantly when the temperature ________________________ .
increases
decreases
dose not change
None of above
At high pressure, gas viscosity _________________ with the increase in pressure especially near the critical point.
Does not change
Increases
Decreases
None of these
The viscosity of the liquids increases with the pressure, but the effect is generally insignificant at pressure less than ____________________ .
10 atmosphere
20 atmosphere
40 atmosphere
50 atmosphere
This expression for the viscosity was obtained by Maxwell in 1860. This equation shows that viscosity of gases is proportional to the __________________ the temperature.
square of
square root of
Two third of
one fourth of
At fluid-solid interfaces, the fluid velocity equals to the velocity with which the ____________________________ , that is, the fluid is assumed to stick to any solid surfaces with which it is in contact.
fluid is moving
surface itself is moving
Both of these
None of these
At gas-liquid interfaces, the momentum flux in the liquid phase is assumed to be _________________. It means the velocity gradient is nearly equal to zero.
Constant
Zero
Unity
None of these
The Hagen-Poiseuille equation gives the relationship between _______________________________ . This equation is applicable only for laminar flow where the value of Reynold’s number is less than 2100.
mass flow rate and volumetric flow rate
volume rate of flow and pressure drop.
Pressure and temperature
None of above
Hagen-Poiseuille equation gives the relationship between volume rate of flow and radius of circular pipe as,
Volume rate of flow is proportional to ________________
R4
R2
R
R3
________________ is the ratio of drag force per unit projected area per product of the velocity head and density of fluid....
Friction factor
Drag
Drag coefficient
None of these
The equation of continuity is developed by making a _______________________ balance over a small element of volume through which fluid is flowing.
Mass
Momentum
Energy
None of above
The equation of motion is developed by making a ________________________ balance over a small element of volume through which fluid is flowing.
Mole
Mass
Momentum
All of above
The equation of change for the mechanical energy, which involves only the mechanical terms, such as __________________________________ which may be derived from equation of motion.
kinetic energy
potential energy
Both of above
None of these
Suppose now that, instead of standing on the bridge we seat in a motorboat and go around the river sometimes going upstream, sometimes across the current or sometimes downstream. If we report the change of fish concentration with respect to time. this is example of _____________________________ .
Substantial time derivatives
Total time derivatives
Partial time derivatives
None of above
A boundary layer is defined as that part of a moving fluid in which the fluid motion is influenced by the presence of _________________________ .
Solid boundary
Liquid flow
Both of above
None of these
Thus a turbulent boundary layer consists of _________________________________ .
Viscous sub layer
Buffer layer
Turbulent zone
All of above
Force exerted on solid surface is expressed as the product of a characteristics area, kinetic energy per unit volume and a dimensionless quantity called as a ___________________________ .
Drag
Drag coefficient
Friction factor
Friction
Kozeny-Carman equation is applicable for the flow of fluid through beds of particle Reynolds number is ______________________________ .
More than 1000
Less than unity
In between 10 to 100
2100
An empirical correlation for the pressure drop in packed beds at high Reynold’s number (NRe.p > 1000) is called ______________________________ .
Kozney Karman equation
Bruke Plummer equation.
Ergens equation
None of above
The macroscopic mechanical energy balance at unsteady state is given by ______________________ .
Bernoulli equation
Continuity equation
Navier Stokes equation
Haigen Poisulle equation
Which is the text book for Transport Phenomena subject ?
Stewart, Bird & Light foot
Bennett & Mayers
Foust & Wenzel
Anderson
Which are the reference books for this subject ?
Bennett & Mayers
Foust & Wenzel
Sissom & Ritts
All of above
Transport Phenomena subject covers which subjects ?
Momentum transport
Heat transport
Mass transport
All of the above
