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Transport Phenomena - Objective Test 1

Total questions: 33

Worksheet time: 17mins

Name
Class
Date
1.

Heat transfer takes place in liquids and gases is essentially due to _____________________

a)

Radiation

b)

Conduction

c)

Convection

d)

Conduction as well as convection

2.

Identify the wrong statement

a)

b)

c)

d)

a)

The process of heat transfer is an irreversible process

b)

For heat exchange, a temperature gradient must exist

c)

A material medium is not necessary for heat transmission

d)

Heat flow doesn’t depend on temperature

3.

The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there ?

a)

One

b)

Two

c)

Three

d)

Four

4.

How many types of convection process are there?

a)

One

b)

Three

c)

Four

d)

Two

5.

Negative sign in Fourier heat conduction equation indicates

a)

Heat always flow is in the direction of positive temperature gradient

b)

Heat always flow in the direction of negative temperature gradient

c)

No heat flow is there

d)

Data is insufficient

6.

Which one is not the unit of thermal conductivity ?

a)

kcal/m hr K

b)

KJ/m hr K

c)

W/m s K

d)

Cal/cm s K

7.

The fluids which obey Newton’s law of viscosity are called _________________________ fluids

a)

Non Newtonian fluid

b)

Newtonian fluid

c)

Both of these

d)

None of these

8.

The relationship between the shear stress and shear rate in the real fluids are part of __________________ .

a)

Non Newtonian behavior

b)

Newtonian behavior

c)

Rheological behavior

d)

None of these

9.

If the shear stress is dependent on time under constant shear rate are called as __________________________ .

a)

Shear dependent fluids

b)

Time dependent fluids

c)

All of the above

d)

None of the above

10.

Drilling mud, toothpaste, sewage sludge, chocolate mixture, greases, soap, paper pulp are the examples of _______________________ .

a)

Di latent fluids

b)

Pseudo plastic fluids

c)

Bingham plastic fluids

d)

Reopectic fluids

11.

These fluids exhibit the behavior of increase in shear stress with the time at a constant rate of shear are called _________________________.

a)

Dilatent fluids

b)

Rheopectic fluids

c)

Thixotropic fluids

d)

None of above

12.

The viscosity of liquids is generally much greater than those of gases. The liquid viscosity decrease significantly when the temperature ________________________ .

a)

increases

b)

decreases

c)

dose not change

d)

None of above

13.

At high pressure, gas viscosity _________________ with the increase in pressure especially near the critical point.

a)

Does not change

b)

Increases

c)

Decreases

d)

None of these

14.

The viscosity of the liquids increases with the pressure, but the effect is generally insignificant at pressure less than ____________________ .

a)

10 atmosphere

b)

20 atmosphere

c)

40 atmosphere

d)

50 atmosphere

15.

This expression for the viscosity was obtained by Maxwell in 1860. This equation shows that viscosity of gases is proportional to the __________________ the temperature.

a)

square of

b)

square root of

c)

Two third of

d)

one fourth of

16.

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.

a)

fluid is moving

b)

surface itself is moving

c)

Both of these

d)

None of these

17.

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.

a)

Constant

b)

Zero

c)

Unity

d)

None of these

18.

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.

a)

mass flow rate and volumetric flow rate

b)

volume rate of flow and pressure drop.

c)

Pressure and temperature

d)

None of above

19.

Hagen-Poiseuille equation gives the relationship between volume rate of flow and radius of circular pipe as,


Volume rate of flow is proportional to ________________

a)

R4

b)

R2

c)

R

d)

R3

20.

________________ is the ratio of drag force per unit projected area per product of the velocity head and density of fluid....

a)

Friction factor

b)

Drag

c)

Drag coefficient

d)

None of these

21.

The equation of continuity is developed by making a _______________________ balance over a small element of volume through which fluid is flowing.

a)

Mass

b)

Momentum

c)

Energy

d)

None of above

22.

The equation of motion is developed by making a ________________________ balance over a small element of volume through which fluid is flowing.

a)

Mole

b)

Mass

c)

Momentum

d)

All of above

23.

The equation of change for the mechanical energy, which involves only the mechanical terms, such as __________________________________ which may be derived from equation of motion.

a)

kinetic energy

b)

potential energy

c)

Both of above

d)

None of these

24.

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 _____________________________ .

a)

Substantial time derivatives

b)

Total time derivatives

c)

Partial time derivatives

d)

None of above

25.

A boundary layer is defined as that part of a moving fluid in which the fluid motion is influenced by the presence of _________________________ .

a)

Solid boundary

b)

Liquid flow

c)

Both of above

d)

None of these

26.

Thus a turbulent boundary layer consists of _________________________________ .

a)

Viscous sub layer

b)

Buffer layer

c)

Turbulent zone

d)

All of above

27.

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 ___________________________ .

a)

Drag

b)

Drag coefficient

c)

Friction factor

d)

Friction

28.

Kozeny-Carman equation is applicable for the flow of fluid through beds of particle Reynolds number is ______________________________ .

a)

More than 1000

b)

Less than unity

c)

In between 10 to 100

d)

2100

29.

An empirical correlation for the pressure drop in packed beds at high Reynold’s number (NRe.p > 1000) is called ______________________________ .

a)

Kozney Karman equation

b)

Bruke Plummer equation.

c)

Ergens equation

d)

None of above

30.

The macroscopic mechanical energy balance at unsteady state is given by ______________________ .

a)

Bernoulli equation

b)

Continuity equation

c)

Navier Stokes equation

d)

Haigen Poisulle equation

31.

Which is the text book for Transport Phenomena subject ?

a)

Stewart, Bird & Light foot

b)

Bennett & Mayers

c)

Foust & Wenzel

d)

Anderson

32.

Which are the reference books for this subject ?

a)

Bennett & Mayers

b)

Foust & Wenzel

c)

Sissom & Ritts

d)

All of above

33.

Transport Phenomena subject covers which subjects ?

a)

Momentum transport

b)

Heat transport

c)

Mass transport

d)

All of the above