1. What is the geometric mean of two heat transfer areas A1 and A2 ?

2. Heat waves

  1. can not pass through vacuum.
  2. travel in straight line.
  3. can be reflected by a mirror.
  4. both (b) and (c).

3. Reynold’s analogy states that

  1. Nst α f
  2. Nst α NRe
  3. NNu α f
  4. NRe α f

4.Fourier’s law applies to the heat transfer by

  1. convection
  2. radiation
  3. conduction
  4. all (a), (b) & (c)

5.In the equation Q = UAΔt; Δt is

  1. geometric mean temperature difference.
  2. arithmetic mean temperature difference.
  3. logarithmic mean temperature difference.
  4. the difference of average bulk temperatures of hot and cold fluids.

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