DBATU Remedial Exam MCQs

Designed To Help You Clear Remedial Exam Easily !

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Heat Transfer Remedial MCQs 1

Q:   Biot number is defined as

  • A:  k/hL
  • B:  kL/h
  • C:  hL/k
  • D:  h/kL

Q:   With rise in temperature, thermal conductivity of solid metals ...

  • A:  Increases
  • B:  Decreases
  • C:  Remain same
  • D:  First increases then decreases

Q:    The steady state heat conduction equation in radial direction in spherical coordinates in absence of any heat source is given by ...

Q:   The dimensionless time, called fourier number, is defined as ...

  • A:  ( α τ ) / L2
  • B:  L2 / ( α τ )
  • C:  ( α τ ) / L
  • D:  L2τ/ α

Q:    It is desired to increase heat dissipation rate from the surface of an electronic device of spherical shape of 5mm radius exposed to convection h= 10 W/m2K by encasing it in a spherical sheath of conductivity k= 0.04 W/m2K. For maximum heat flow, the diameter of the sheath should be ...

  • A:  12mm
  • B:  18mm
  • C:  16mm
  • D:  8mm

Q:   Heisler's chart shows the temperature time history of a solid in transient heat conduction as a function of ...

  • A:  Fourier & Biot number
  • B:  Reciprocal of Fourier number & Biot number
  • C:  Fourier number & reciprocal of Biot number
  • D:  Reciprocal of Fourier number & reciprocal of Biot number

Q:   The maximum temperature at the centre of solid sphere of radius R having heat generation of qG(W/m3) is given by ...

Q:   The temperature profile for heat conduction through a wall of constant thermal conductivity in the presence of a heat source is ...

  • A:  a straight line
  • B:  parabolic
  • C:  logarithmic
  • D:  hyperbolic

Q:   In one-dimensional transient numerical method, the choice of the time interval Δt in the finite difference equations is limited by the condition that Δx2/αΔt

  • A:  is less than 2
  • B:  is euqal to 2
  • C:  is greater than 2
  • D:  either b or c

Q:   The quantity having the dimesion of time is often called the time constant of a thermo-couple

  • A:  hA/ρCV
  • B:  hV/ρCA
  • C:  ρCV/hA
  • D:  ρCA/hV
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