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Heat Transfer
Heat Transfer Multiple Choice
Quiz 1
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Q.1
Diagram shows transient heat conduction in an infinite plane wall. Identify the correct boundary condition in transient heat conduction in solids with finite conduction
a) t = t i at T = 0
b) d t /d x = 1 at x = 0
c) d t /d x = infinity at x = 1
d) d t / d x = infinity at x = 0
Q.2
Let there is some conduction resistance, then temperature becomes a function of
a) i and ii
b) ii and iii
c) i and iii
d) i, ii and iii
Q.3
The value of Biot number and Fourier number, as used in the Heisler charts, are evacuated on the basis of a characteristics parameter s which is the thickness in case of plates and the surface radius in case of cylinders and spheres.
a) True
b) False
Q.4
A large steel platemm thick is initially at a uniform temperature ofdegree Celsius. It is suddenly exposed on both sides to an environment with convective coefficientW/m2 K and temperaturedegree Celsius. Determine the center line temperature.
a) 261 degree Celsius
b) 271 degree Celsius
c) 281 degree Celsius
d) 291 degree Celsius
Q.5
With respect to above problem, determine the temperature inside the plate 12.5 mm from the mid plane after 3 minutes
a) 272.36 degree Celsius
b) 262.36 degree Celsius
c) 252.36 degree Celsius
d) 22.35 degree Celsius
Q.6
When Biot number exceeds 0.1 but is less thanuse is made of Heislers charts for the solution of transient heat conduction.
a) True
b) False
Q.7
In transient heat conduction, the two significant dimensionless parameters are
a) Reynolds number and Fourier number
b) Reynolds number and Biot number
c) Reynolds number and Prandtl number
d) Biot number and Fourier number
Q.8
Acm diameter cylindrical bar, initially at a uniform temperature ofdegree Celsius, is placed in a medium atdegree Celsius with convective coefficient ofW/m2 K. Determine the time required for the center to reachdegree Celsius. For the material of the bar:
a) 1234.5 seconds
b) 1973.16 seconds
c) 3487.3 seconds
d) 2896.4 seconds
Q.9
Consider the above problem, calculate the temperature of the surface at this instant
a) 476.4 degree Celsius
b) 453.5 degree Celsius
c) 578.9 degree Celsius
d) 548.6 degree Celsius
Q.10
A solid which extend itself infinitely in all directions of space is termed as finite solid.
a) True
b) False
0 h : 0 m : 1 s
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