Unsteady state heat conduction occurs, when

Heat transfer by conduction occurs when molecules

A

Collide

B

Combine

C

Heated

D

None of the above

Fourier's law of heat conduction gives the heat flow for

A

Irregular surfaces

B

Nonuniform temperature surfaces

C

One dimensional cases only

D

Two dimensional cases only

In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.

A

Geometric

B

Arithmetic

C

Logarithmic

D

Either A, B or C

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

A

Linear

B

Hyperbolic

C

Parabolic

D

None of these

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is

A

[

A. Thin walled having the value of A_o A_i/

B. Thick walled

B

Having the value of A_o/A_i > 2

C

Both B and C

A chemical process is said to occur under unsteady state, if the

A

Inventory changes do not take place

B

Ratio of streams entering/leaving are independent of time

C

Flow rates & composition both are time dependent

D

None of these

For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by

A

$$\frac{{\partial {\text{u}}}}{{\partial {\text{x}}}} = 0$$

B

$$\frac{{\partial \left( {\rho {\text{u}}} \right)}}{{\partial {\text{x}}}} = 0$$

C

$$\frac{{\partial {\text{u}}}}{{\partial {\text{x}}}} = - \frac{{\partial \rho }}{{\partial {\text{t}}}}$$

D

$$\frac{{\partial \rho }}{{\partial {\text{t}}}} = 0$$

Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

A

There is no internal heat generation

B

Boundary surfaces are isothermal

C

Material is anisotropic

D

Constant temperature gradient exists

An example of unsteady non uniform flow is the flow of liquid under pressure through a

A

Tapering pipe at constant flow rate

B

Tapering pipe at either decreasing or increasing flow rate

C

Long pipeline of constant diameter

D

None of these

The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.

A

Normal

B

Local

C

Convective

D

Tangential

Unsteady state heat conduction occurs, when

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