General Heat Conduction Equation MCQ

Test your knowledge with important General Heat Conduction Equation MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more General Heat Conduction Equation MCQs at Bissoy

• The diffusion equations Ɏ2t + q g = (1/α) (d t/d r) Governs the temperature distribution under unsteady heat flow through a homogeneous and isotropic material. The Fourier equation follows from this expression when
  ক

  Temperature doesn’t depends on time

  খ

  There is no internal heat generation

  গ

  Steady state conditions prevail

  ঘ

  There is no internal heat generation but unsteady state condition prevails
• To effect a bond between two metal plates, 2.5 cm and 15 cm thick, heat is uniformly applied through the thinner plate by a radiant heat source. The bonding must be held at 320 K for a short time. When the heat source is adjusted to have a steady value of 43.5 k W/m2, a thermocouple installed on the side of the thinner plate next to source indicates a temperature of 345 K. Calculate the temperature gradient for heat conduction through thinner plate. In the diagram, the upper plate is 2.5 cm thick while the lower is 15 cm thick.
  ক

  – 1000 degree Celsius/m

  খ

  – 2000 degree Celsius/m

  গ

  – 3000 degree Celsius/m

  ঘ

  – 4000 degree Celsius/m
• The unit of thermal diffusivity is
  ক

  m2/hr-K

  খ

  kcal/m2-hr

  গ

  m2/hr

  ঘ

  m/hr-K
• The relation Ϫ2 t =0 is referred to as
  ক

  Poisson’s equation

  খ

  Fourier heat conduction equation

  গ

  Solution for transient conduction

  ঘ

  Laplace equation
• The thermal conductivity and the electrical conductivity of a metal at absolute temperature are related as
  ক

  k/σ T

  খ

  k/σ

  গ

  k σ/T

  ঘ

  k/T
• Consider the following parameters (i) Composition (ii) Density (iii) Porosity (iv) Structure Then, thermal conductivity of glass wool varies from sample to sample because of variation is
  ক

  i and ii

  খ

  i, ii, iii and iv

  গ

  i and iii

  ঘ

  i, ii and iii
• For liquids, thermal conductivity is governed by the relation
  ক

  k = A c p p7/3/M1/3

  খ

  k = 2A c p p4/3/M2/3

  গ

  k = A c p p4/3/M1/3

  ঘ

  k = A c p p8/3/M1/3
• The value of Lorenz number in 10-8 W ohms/K2 is
  ক

  2.02

  খ

  2.35

  গ

  2.56

  ঘ

  2.45
• Low temperature insulation are used when the enclosure is at a temperature lower than the ambient temperature. Which one of the following is not a low temperature insulation?
  ক

  Asbestos

  খ

  Cork

  গ

  Cattle hair

  ঘ

  Slag wool
• From the concept of kinetic theory, mean travel velocity of the gas molecules is prescribed by the relation
  ক

  V = (3M/GT) 1/2

  খ

  V = (3GT/M) 1/2

  গ

  V = (6T/GM) 1/2

  ঘ

  V = (3GT/2M) 1/2