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
Questionheat-transfer-questions-answers1.jpg
  • 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