Fourier's law of heat conduction is valid for

A One dimensional cases only
B Two dimensional cases only
C Three dimensional cases only
D Regular surfaces having non-uniform temperature gradients

Correct Answer: One dimensional cases only

Fourier's law of heat conduction is valid for One dimensional cases only
Fourier equation is valid for all matter solid, liquid or gas. The vector expression indicating that heat flow rate is normal to an isotherm and is in the direction of decreasing temperature.
Bissoy MCQ
#Mechanical Engineering #Heat And Mass Transfer

Related Questions

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
Fourier's law of heat conduction applies to __________ surfaces.
A Isothermal
B Non-isothermal
C Both A and B
D Neither A and B
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
Heat conduction in gases is due to
A Elastic impact of molecules
B Movement of electrons
C EM Waves
D Mixing of gases

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