Heat Transfer

Heat Transfer

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

  1. \sqrt{A_1A_2}
  2. \sqrt{A_1+A_2}
  3. \frac{1}{2} \sqrt{A_1.A_2}
  4. 2 \sqrt{A_1.A_2}

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.

Check Your Answers Here 

  1. 1    
  2. 4
  3. 1
  4. 1
  5. 3

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