Transient Heat Conduction in Solids with Finite Conduction MCQ

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• A solid which extend itself infinitely in all directions of space is termed as finite solid.
  ক

  True

  খ

  False
• Consider the above problem, calculate the temperature of the surface at this instant
  ক

  476.4 degree Celsius

  খ

  453.5 degree Celsius

  গ

  578.9 degree Celsius

  ঘ

  548.6 degree Celsius
• A 12 cm diameter cylindrical bar, initially at a uniform temperature of 40 degree Celsius, is placed in a medium at 650 degree Celsius with convective coefficient of 22 W/m2 K. Determine the time required for the center to reach 255 degree Celsius. For the material of the bar: Thermal conductivity = 20 W/m K Density = 580 kg/m3 Specific heat = 1050 J/kg K
  ক

  1234.5 seconds

  খ

  1973.16 seconds

  গ

  3487.3 seconds

  ঘ

  2896.4 seconds
• In transient heat conduction, the two significant dimensionless parameters are
  ক

  Reynolds number and Fourier number

  খ

  Reynolds number and Biot number

  গ

  Reynolds number and Prandtl number

  ঘ

  Biot number and Fourier number
• When Biot number exceeds 0.1 but is less than 100, use is made of Heislers charts for the solution of transient heat conduction.
  ক

  True

  খ

  False
• With respect to above problem, determine the temperature inside the plate 12.5 mm from the mid plane after 3 minutes
  ক

  272.36 degree Celsius

  খ

  262.36 degree Celsius

  গ

  252.36 degree Celsius

  ঘ

  22.35 degree Celsius
• A large steel plate 50 mm thick is initially at a uniform temperature of 425 degree Celsius. It is suddenly exposed on both sides to an environment with convective coefficient 285 W/m2 K and temperature 65 degree Celsius. Determine the center line temperature. For steel, thermal conductivity = 42.5 W/m K and thermal diffusivity = 0.043 m2/hr
  ক

  261 degree Celsius

  খ

  271 degree Celsius

  গ

  281 degree Celsius

  ঘ

  291 degree Celsius
• 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.
  ক

  True

  খ

  False
• Let there is some conduction resistance, then temperature becomes a function of (i) Biot number (ii)Fourier number (iii) Dimensionless parameter
  ক

  i and ii

  খ

  ii and iii

  গ

  i and iii

  ঘ

  i, ii and iii
• Diagram shows transient heat conduction in an infinite plane wall. Identify the correct boundary condition in transient heat conduction in solids with finite conduction
  ক

  t = t i at T = 0

  খ

  d t /d x = 1 at x = 0

  গ

  d t /d x = infinity at x = 1

  ঘ

  d t / d x = infinity at x = 0