Related Questions

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 Ao Ai/

B. Thick walled

B Having the value of Ao/Ai > 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

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