Heat Transfer Practice Test 8

1. The excess temperature range 50 degree Celsius < d t < 200 degree Celsius is indicative of the region of

2. The bubble diameter at the time of detachment from the surface can be worked out from the relation proposed by

3. For a plate of length l, an average value of Nusselt number is given by

4. The heat flux in nucleate boiling varies in accordance with

5. The nucleate pool boiling is influenced by the following factors
(1) Pressure
(2) Liquid properties
(3) Material
Identify the correct statements

6. The phenomenon of stable film boiling is referred to as

7. For water evaporating at atmospheric pressure, the burnout occurs at temperature excess slightly above

8. Natural convection heat transfer coefficients over surface of a vertical pipe and a vertical flat plate for same height. What is/are the possible reasons for this?
(i) Same height
(ii) Both vertical
(iii) Same fluid
(iv) Same fluid flow pattern
Select the correct answer

9. Drop wise condensation usually occurs on

10. Estimate the peak heat flux for water boiling at normal atmospheric pressure. The relevant thermo-physical properties are
p _f (liquid) = 958.45 kg/m³
p _g (vapor) = 0.61 kg/m³
h _{f g} = 2.25 * 10 ⁶ J/kg
σ = 0.0585 N/m