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